Groin pain in highly active adults — is it hip impingement or something else?

Groin pain in highly active adults presents a genuinely complex diagnostic challenge. Femoroacetabular impingement is a leading cause, but a systematic differential is essential, and femoral neck stress fracture must always be ruled out first.

Femoroacetabular impingement, or FAI, occurs when abnormal bone morphology causes the femoral head and acetabulum to make excessive contact during movement. In active adults this typically manifests as deep groin or anterior hip pain with flexion-based activities such as squatting, cycling, and kicking. Patients often demonstrate the "C-sign," cupping the hand around the lateral hip to indicate where the pain lives. Pain with prolonged sitting or hip flexion past 90 degrees is common, and the FADIR test — Flexion, ADduction, Internal Rotation — is the standard provocation maneuver.

Hip labral tears are closely related and frequently coexist with FAI. They tend to produce clicking or locking sensations in addition to the deep groin pain pattern, and their prevalence in active adults is high. Adductor strain is equally common in this population and is distinguished by medial groin pain that reproduces with resisted adduction. Athletic pubalgia, sometimes called sports hernia, presents in the lower groin with pain provoked by Valsalva maneuver and no palpable hernia on examination. Hip flexor tendinopathy produces anterior hip pain often accompanied by a snapping sensation. Inguinal hernia may refer pain to the groin and is identified by a palpable bulge and cough impulse. Osteitis pubis causes tenderness directly over the pubic symphysis and is often bilateral. Early hip osteoarthritis tends to appear in older active adults and carries morning stiffness as a hallmark feature. Referred pain from lumbar levels L1 through L3 can reproduce a groin pain pattern and should be considered when the dermatomal distribution fits.

Femoral neck stress fracture occupies a separate category because of its urgency. It presents with insidious onset, night pain, and a history of recent training load increase. Any active adult with this combination of features requires same-day imaging and immediate weight-bearing restriction. Avascular necrosis and septic arthritis — the latter presenting with fever and joint effusion — are similarly time-sensitive and warrant urgent evaluation when clinical features suggest them.

The diagnostic workup for a suspected FAI or labral source begins with a thorough clinical hip examination including the FADIR, FABER, and log-roll tests, which allow meaningful narrowing of the differential. An AP pelvis and lateral hip X-ray should be obtained at the first visit to identify FAI morphology. If a labral tear is suspected, MRI arthrogram is the appropriate next step and should be completed within one to two weeks. Concurrent movement pattern analysis can identify biomechanical contributors while imaging is pending.

Once red flags are excluded and the diagnosis is clarified, a conservative rehabilitation trial of activity modification and targeted strengthening is the appropriate first intervention. The evidence supports a 6 to 12 week trial, and approximately 60 to 70 percent of patients respond without requiring surgery. If the diagnosis remains unclear after clinical examination and imaging, an intra-articular diagnostic injection can confirm or exclude an intra-articular pain source. Surgical consultation for hip arthroscopy — addressing FAI correction and labral repair — is reserved for patients in whom a well-structured conservative program has failed.

Several clinical details substantially improve the accuracy of this differential when evaluating an individual patient. The precise location of pain — deep groin, inner thigh, anterior hip, or pubic region — carries diagnostic weight, as does the specific activity that provokes it. Whether the onset was sudden or gradual, and whether any discrete incident preceded it, helps distinguish traumatic from overuse pathology. Duration, the presence or absence of night pain, any mechanical sensations such as clicking or locking, prior imaging or treatment, recent changes in training volume or intensity, and whether the pain is unilateral or bilateral all contribute meaningfully to narrowing the diagnosis.

Groin pain in highly active adults is one of the most diagnostically complex presentations in sports medicine. The anatomy of the hip-groin region is a convergence zone where multiple pain generators overlap, and the nervous system does not always indicate clearly which one is responsible. Understanding this region requires working through the pain neuroscience, the differential diagnosis, and the management principles in a systematic way.

Before naming a diagnosis, it helps to understand the nociceptive landscape of the hip-groin region. The hip joint, labrum, iliopsoas, adductors, pubic symphysis, and inguinal structures all share overlapping neural territories — primarily through the obturator nerve (L2-L4), the femoral nerve (L2-L4), and the ilioinguinal and genitofemoral nerves. This anatomical reality means that peripheral sensitization from one structure, such as a compressed labrum, can create referred pain patterns that convincingly mimic pathology in a completely different structure. In highly active adults, repetitive mechanical loading creates a state of sustained peripheral nociceptor activation — the tissue is constantly being asked to repair while simultaneously being reloaded. If this cycle persists beyond 6 to 8 weeks without resolution, central sensitization begins to develop, in which the spinal cord and brain amplify pain signals disproportionate to actual tissue damage.

In most groin pain presentations, three mechanisms are simultaneously active. The first is nociceptive and inflammatory, arising from direct tissue loading of the labrum, cartilage, or tendon. The second is peripheral neuropathic, from nerve compression or irritation — obturator nerve entrapment in particular is dramatically underdiagnosed. The third is central amplification, which is especially common in athletes who continue training through pain, creating a persistent threat signal the nervous system refuses to downgrade.

The pain-spasm-pain cycle is critically important in groin presentations. The iliopsoas and adductor complex respond to hip joint threat by increasing tone — a protective response. However, this increased muscular tension compresses the hip joint further, raising intra-articular pressure, reducing joint space, worsening any existing impingement, and creating secondary myofascial pain that outlasts the original injury. Restricted movement is then interpreted by the nervous system as confirmation of threat, perpetuating the cycle.

Femoroacetabular impingement (FAI) — whether cam, pincer, or mixed morphology — causes pain through mechanical labral compression during hip flexion, adduction, and internal rotation. The characteristic pain is sharp and catching at end-range hip flexion, provoked by sitting longer than 30 minutes, squatting, or pivoting sports, and is typically worse after activity as inflammatory mediators accumulate. The FADIR test (flexion, adduction, internal rotation) is the standard provocation maneuver, and patients often demonstrate the classic C-sign, cupping the hand around the lateral hip. However, imaging studies show cam morphology in 20 to 37 percent of asymptomatic athletes, which means FAI on an MRI does not automatically explain a patient's pain.

Several other conditions must be considered alongside FAI. Athletic pubalgia, also called sports hernia, produces deep inguinal and pubic pain that is worse with Valsalva maneuvers and kicking, and reflects dysfunction of the adductor-abdominal force couple. Adductor tendinopathy presents as medial groin pain that is tender on palpation, load-dependent, and associated with morning stiffness. Iliopsoas tendinopathy or bursitis causes anterior hip and groin pain with a snapping sensation, provoked by hip flexion from an extended position. Obturator nerve entrapment produces medial thigh burning or numbness that is exercise-induced and resolves with rest, and is identified through neurodynamic testing and the finding of adductor weakness. Osteitis pubis causes central pubic pain with bilateral adductor involvement and is common in kicking and cutting sports. Labral tears produce deep joint pain, clicking, and giving way, and frequently coexist with FAI. Referred pain from an L2-L3 disc herniation can produce groin pain without clear hip provocation, making lumbar spine examination essential. Femoral neck stress fracture is a red flag diagnosis: groin pain at rest, night pain, and progressive worsening in a patient who cannot hop on the affected leg requires urgent evaluation.

Regarding pain management, activity modification is not rest — it is intelligent loading. The goal is to identify the specific movements that provoke pain above 3 out of 10 and temporarily substitute alternatives that maintain fitness without provoking sensitized tissue. Acceptable pain during rehabilitation is 0 to 3 out of 10, returning to baseline within 24 hours of activity. If pain exceeds 4 out of 10 or takes longer than 24 hours to settle, the tissue's current tolerance has been exceeded and load should be reduced by 30 to 40 percent.

For local symptom control, ice applied for 15 to 20 minutes post-activity to the anterior hip and groin region is appropriate. Icing before activity is not recommended, as it reduces proprioceptive feedback and muscle activation efficiency. A hip compression sleeve during daytime activity can reduce adductor and iliopsoas swelling and provide proprioceptive input that calms peripheral sensitization; compression should be removed at night to allow normal circulation and lymphatic drainage during the tissue repair window.

In the acute phase, defined as less than 2 weeks, NSAIDs taken with food and timed to cover peak activity periods can be useful — the purpose is enabling movement, not masking pain. Beyond 2 weeks, the rationale for systemic anti-inflammatories weakens considerably. Chronic tendinopathy and FAI are not primarily inflammatory conditions, and NSAIDs may actually impair tendon remodeling.

Nervous system de-escalation is where most protocols fall short. The nervous system of a highly active adult has been trained to interpret groin pain as a threat to athletic identity, which amplifies the pain signal beyond what the tissue damage alone would produce. Several principles are important here. Pain does not equal harm: in the absence of red flags, pain during movement reflects an overly protective nervous system, not ongoing tissue destruction. Flare-ups are expected during rehabilitation and represent the nervous system recalibrating, not a clinical setback. Graded exposure to provocative movements — beginning at 20 to 30 percent of the pain threshold — progressively teaches the nervous system that these movements are safe, downregulating the threat response over 4 to 8 weeks.

Certain presentations require urgent medical evaluation rather than conservative management. Night pain that wakes a patient from sleep raises concern for stress fracture, avascular necrosis, or malignancy. Inability to weight bear or hop on the affected leg should be treated as a femoral neck stress fracture until proven otherwise. Fever, malaise, or unexplained weight loss accompanying hip pain suggests septic arthritis or malignancy. Progressive neurological symptoms — numbness, weakness, or altered sensation in the thigh or groin — require prompt investigation. Pain at rest that is constant and unrelenting is not mechanical in nature and requires imaging. Rapid worsening over days without a clear mechanical explanation also warrants escalation.

Given the complexity of this region, a structured diagnostic pathway prevents the common error of treating the image rather than the patient. Clinical examination comes first and should include the FADIR, FABER, Thomas test, adductor squeeze test, Trendelenburg test, and lumbar spine screening. Plain X-ray follows to assess for cam and pincer morphology, joint space narrowing, stress fracture, and osteitis pubis. If FAI or labral tear is suspected, MRI with arthrogram is preferred over standard MRI, which misses up to 40 percent of labral tears. When the diagnosis remains unclear after imaging, an image-guided intra-articular injection can confirm whether the hip joint is the primary pain generator. Nerve conduction studies are indicated when obturator nerve entrapment is suspected.

Groin pain in highly active adults is rarely a single diagnosis. FAI is real and common, but it frequently coexists with adductor tendinopathy, athletic pubalgia, or iliopsoas pathology, and the nervous system's response to chronic loading creates a sensitization layer that must be addressed alongside the structural issue. The governing clinical principle is to treat the pain mechanism, not just the anatomy. An athlete with FAI who has developed central sensitization will not recover from surgery alone — the nervous system requires rehabilitation just as much as the hip joint does.

Groin pain in highly active adults is one of the most diagnostically complex presentations in sports medicine, and the reason is straightforward: the hip joint sits at the convergence of multiple kinetic chain forces, and its arthrokinematics are exquisitely sensitive to both structural and neuromuscular dysfunction.

Femoroacetabular impingement (FAI) is the most commonly cited culprit, but it is frequently over-diagnosed. FAI occurs when abnormal contact happens between the femoral head-neck junction and the acetabular rim during end-range motion — particularly hip flexion, internal rotation, and adduction, the classic FADIR position. There are two structural variants. CAM impingement involves an aspherical femoral head, often described as a bump at the head-neck junction, that jams into the acetabulum during flexion; it is more common in males and in athletes who trained intensively during skeletal development. Pincer impingement involves acetabular over-coverage that causes the labrum to be crushed between the rim and the femoral neck, and it is more common in active females. Mixed-type impingement, where both mechanisms are present simultaneously, is the most common clinical finding.

The critical biomechanical insight, however, is that structural FAI does not always equal symptomatic FAI. Research shows that up to 37% of asymptomatic athletes have radiographic FAI findings. This means movement pattern dysfunction — not just bony morphology — is often the primary driver of pain.

Before anchoring on FAI, a thorough evaluation must consider the full differential. Adductor-related groin pain, or adductor enthesopathy, is the most common groin injury in cutting and kicking sports; the adductor longus origin at the pubic symphysis is under enormous tensile load during rapid direction changes. Iliopsoas-related pain arises when the iliopsoas tendon snaps over the iliopectineal eminence — coxa saltans interna — producing anterior groin pain and a palpable or audible snap during hip flexion-extension cycling. Pubic symphysis stress and athletic pubalgia result from shear forces at the pubic symphysis from asymmetric loading, particularly in rotational sports, and can create a spectrum of pathology ranging from osteitis pubis to sports hernia. Labral pathology often co-exists with FAI but can occur independently; the labrum provides 20–25% of hip joint stability and acts as a suction seal, and labral tears alter joint fluid pressurization and accelerate cartilage wear. Hip flexor strain involves acute or chronic overload of the rectus femoris or iliopsoas musculotendinous unit. Finally, lumbar referred pain from L1–L3 nerve root irritation can refer pain directly into the groin and is a frequently missed diagnosis.

Several dysfunctional movement patterns appear consistently in FAI and groin pathology. The most biomechanically significant is loss of hip internal rotation in flexion. Normal hip internal rotation at 90° of flexion should be 30–40°; in FAI, this is often reduced to 10–20°. The arthrokinematic consequence is that during activities requiring hip flexion — squatting, running, cutting — the femoral head cannot roll and glide posteriorly with adequate freedom, creating anterior impingement.

Anterior pelvic tilt dominance is another common pattern. Highly active adults, particularly those with tight hip flexors from prolonged sitting combined with athletic loading, develop a habitual anterior pelvic tilt. This increases effective acetabular anteversion, reduces the available anterior joint space, and predisposes to impingement at lower ranges of flexion than the structural anatomy alone would suggest.

Contralateral pelvic drop, or the Trendelenburg pattern, arises from gluteus medius weakness or inhibition, causing the pelvis to drop on the swing limb side during single-leg stance. This creates a relative adduction moment at the stance hip, increasing compressive load on the superior acetabular rim — exactly where most labral tears occur.

When hip mobility is restricted, the lumbar spine compensates through hypermobility. This is visible in the squat pattern: instead of hip flexion driving the descent, lumbar flexion increases to maintain depth, transferring load to the posterior lumbar structures and perpetuating the hip restriction cycle. Related to this is altered hip-trunk dissociation. Healthy movement requires the ability to move the hip independently of the lumbar spine, but in groin pain patients this dissociation is consistently impaired — the trunk and pelvis move as a single unit, reducing shock absorption capacity and increasing joint loading.

These local dysfunctions produce consequences throughout the kinetic chain. Proximally, compensatory motion increases lumbar compressive loading, stresses the SI joint through asymmetric pelvic loading, overactivates the ipsilateral quadratus lumborum, and compromises core stability — the hip and core being functionally inseparable. Distally, the ipsilateral knee collapses into valgus during dynamic loading as the hip adducts and internally rotates excessively in compensation. Tibial internal rotation stress increases, foot pronation timing is altered as the subtalar joint compensates for restricted hip internal rotation by increasing pronation duration, and the contralateral limb absorbs disproportionate force.

Rehabilitation proceeds across three phases, with progression driven by measurable outcomes rather than calendar dates.

Phase 1, spanning weeks 1 through 3, targets pain modulation, joint mobility restoration, and neuromuscular baseline. Hip joint distraction mobilization is performed supine with a resistance band around the proximal thigh pulling laterally and slightly inferiorly, with gentle hip flexion and extension oscillations in the distracted position; 3 sets of 60 seconds twice daily. This restores inferior and posterior glide of the femoral head, directly addressing the arthrokinematic restriction in FAI. The 90/90 hip mobility passive hold is performed seated on the floor with the front leg at 90° hip flexion and 90° knee flexion and the rear leg at 90° hip extension and 90° knee flexion, maintaining a neutral lumbar spine throughout; 45–60 seconds per side for 3 repetitions twice daily, progressing to an active internal rotation reach toward the front shin once the passive hold is pain-free. Supine hip internal rotation stretching is performed with the hip at 45° of flexion — not 90°, which avoids the impingement zone — rotating the femur internally and holding 30 seconds for 4 repetitions per side twice daily; the pelvis must remain flat, as pelvic rotation is a compensation rather than hip mobility. Iliopsoas lengthening in the half-kneeling position requires a posterior pelvic tilt before any forward lean — this is the critical differentiator from an ineffective stretch — held 45 seconds for 3 repetitions per side daily, progressing to an ipsilateral overhead arm reach once pelvic neutral is maintained.

Phase 2, spanning weeks 3 through 8, focuses on neuromuscular re-education and stability. The clamshell with resistance band targets gluteus medius activation: side-lying with hips at 45° flexion and knees at 90°, a light band above the knees, opening the top knee toward the ceiling without rotating the pelvis or lumbar spine; 3 sets of 15 repetitions daily, progressing to standing hip abduction when 15 repetitions are performed with zero pelvic compensation. The supine bridge with hip abduction hold uses a resistance band above the knees; the knees press outward against the band throughout while the bridge is performed, simultaneously activating gluteus medius and maximus in a functional co-contraction pattern; 3 sets of 12 repetitions daily. The dead bug exercise addresses hip-trunk dissociation: supine with arms vertical and hips and knees at 90°, maintaining lumbar neutral with a hand under the lumbar spine as biofeedback, slowly lowering one heel toward the floor while extending the opposite arm; 3 sets of 8 repetitions per side daily, progressing to a resistance band around the feet when lumbar neutral is maintained for all 8 repetitions. Single-leg balance progresses from eyes open on a firm surface for 3 sets of 30 seconds per side in weeks 3–4, to eyes closed on a firm surface in weeks 5–6, to eyes open on an unstable surface such as a foam pad in weeks 7–8, with the progression criterion being zero Trendelenburg sign throughout the hold duration. The lateral band walk is performed with a resistance band above the ankles in a quarter-squat position, 15 steps laterally in each direction for 3 sets three times per week, maintaining a level pelvis without hiking the hip of the stepping leg.

Phase 3, spanning weeks 8 through 16, addresses functional loading and movement pattern restoration. The goblet squat begins with 1–2 inches of heel elevation to reduce ankle dorsiflexion demand and allow focus on hip mechanics, holding light weight at the chest with feet shoulder-width apart and toes slightly out 10–15°, descending only to the depth where lumbar neutral can be maintained; 3 sets of 10 repetitions three times per week, progressing by removing heel elevation when 10 repetitions are achieved with symmetric hip internal rotation and no anterior knee pain. The Romanian deadlift establishes posterior chain loading and hip hinge mechanics, beginning with bodyweight or light dumbbells, hinging at the hip with a neutral spine to the point of hamstring tension at end range; 3 sets of 10 repetitions three times per week, increasing load by 10% when form is consistent across all 3 sets. The step-up with hip flexion control uses a 6–8 inch step, stepping up leading with the affected side and bringing the opposite knee to 90° of hip flexion at the top before slowly lowering; the eccentric control on the descent is the therapeutic component; 3 sets of 10 repetitions three times per week. The lateral lunge steps laterally, sitting into the hip of the stepping leg while keeping the opposite leg straight, directly loading the adductors eccentrically — critical for adductor-related groin pain; 3 sets of 8 repetitions per side three times per week, progressing to a dumbbell held at the chest when the bodyweight version is pain-free.

Progression between phases is governed by objective benchmarks. Advancement from Phase 1 to Phase 2 requires hip internal rotation in 45° of flexion of at least 25° measured with a goniometer, FADIR test pain reduced to 2/10 or less from baseline, single-leg stance of at least 20 seconds without a Trendelenburg sign, and pain with daily activities of 3/10 or less. Advancement from Phase 2 to Phase 3 requires hip internal rotation in 90° of flexion of at least 20°, single-leg balance of 30 seconds eyes closed with zero pelvic drop, clamshell performance of 3 sets of 15 with zero pelvic rotation compensation, and pain with exercise of 2/10 or less resolving within 24 hours post-activity. Return to full activity requires symmetrical hip internal rotation within 5° side-to-side, single-leg squat performance of 10 repetitions with no knee valgus, no Trendelenburg sign, and no trunk lateral lean, and hop test symmetry of at least 90% on single-leg hop testing.

Groin pain in highly active adults is one of the most diagnostically nuanced presentations in sports medicine, and the honest answer is that it is rarely just one thing. Hip femoroacetabular impingement (FAI) is frequently cited, but it exists on a spectrum alongside several other conditions that share overlapping presentations. Getting this right matters enormously because the rehabilitation approach differs significantly depending on the primary driver.

The major differential diagnoses to consider, in order of clinical frequency in active adults, are as follows. Femoroacetabular impingement — cam, pincer, or mixed morphology — causes labral stress and intra-articular pain. Adductor-related groin pain is the most common cause in field sport athletes, often involving the adductor longus at its pubic attachment. Athletic pubalgia, or sports hernia, involves posterior inguinal wall weakness with or without adductor involvement. Iliopsoas-related pain presents as tendinopathy or snapping (coxa saltans interna). Pubic symphysis stress and osteitis pubis are particularly common in kicking and cutting sports. Lumbar referred pain — specifically L2-L3 referral patterns — mimics anterior hip and groin pain with surprising frequency. Hip labral tears often co-exist with FAI morphology but can occur in isolation. Finally, stress fracture of the femoral neck is a critical diagnosis not to miss in high-volume athletes.

Regardless of the structural diagnosis, the neuromuscular picture in chronic groin pain follows a predictable pattern of inhibition and compensation that must be addressed directly. The deep hip external rotators — piriformis, obturator internus and externus, gemelli, and quadratus femoris — are almost universally inhibited in FAI and labral pathology. These muscles function as the rotator cuff of the hip, providing dynamic joint compression and centration. When they fail, the femoral head translates anteriorly and superiorly during loading, which is precisely the mechanism that drives impingement and labral stress.

The gluteus medius and minimus undergo rapid inhibition in response to hip pain through arthrogenic muscle inhibition (AMI) — a neurologically mediated reflex arc in which joint afferent signals suppress alpha motor neuron activity. This is not weakness from disuse alone; it is active neural suppression. The functional consequence is Trendelenburg-pattern loading, increased adductor dominance, and contralateral pelvic drop that amplifies hip joint contact forces.

The transversus abdominis and pelvic floor lose their anticipatory activation timing. In healthy individuals, these structures pre-activate 20 to 30 milliseconds before limb movement. In groin pain presentations, this timing is disrupted, removing the hydraulic stabilization of the lumbopelvic cylinder that normally protects the pubic symphysis and hip joint during dynamic loading.

On the compensatory side, the adductor complex becomes overloaded as it attempts to compensate for gluteal and deep rotator inhibition. This creates a vicious cycle: adductor overuse leads to tendinopathy at the pubic attachment, which further disrupts lumbopelvic stability, which further inhibits the glutes. This is why isolated adductor stretching rarely resolves groin pain. The iliopsoas simultaneously becomes hyperactive and shortened, pulling the femoral head anteriorly and contributing to anterior impingement in cam-type FAI. It also loses its role as a dynamic hip stabilizer and functions primarily as a hip flexor, increasing anterior joint stress.

The rehabilitation protocol is organized into three phases with clear entry and exit criteria. The appropriate starting phase is determined by current pain levels and functional capacity.

Phase 1 spans weeks 1 through 3, and its goal is not strength — it is restoring motor neuron recruitment to inhibited muscles and establishing pain-free movement patterns. For deep hip external rotator activation, sidelying clamshells with a resistance band are performed for 3 sets of 20 repetitions, twice daily, with the band placed just above the knees. The cue is to rotate the femur in the socket without moving the pelvis; the pelvis must remain completely still. If the patient cannot isolate hip rotation from pelvic movement, the exercise should be regressed to supine with feet flat. The progression criterion is 3 sets of 20 with zero pelvic compensation and no pain. Prone hip external rotation in the 90/90 position is performed for 3 sets of 15, once daily: lying prone with the knee bent to 90 degrees, the patient slowly lowers the foot outward toward the table. The cue is to feel the deep muscles behind the hip working, not the gluteus maximus, which specifically targets the short external rotators without gluteus maximus dominance.

For gluteus medius reactivation, supine hip abduction with biofeedback is performed for 3 sets of 15, twice daily. The patient places a hand on the lateral hip to feel gluteus medius activation, with the cue to push the hip bone into the hand. This tactile biofeedback is critical in the early phase when AMI is present. Standing hip hike — a Trendelenburg reversal — is performed for 3 sets of 12 each side, once daily. Standing on one leg, the patient actively elevates the non-stance pelvis using the stance hip abductors, which is a direct functional challenge to the AMI pattern.

For lumbopelvic stability, the dead bug with breath control is performed for 3 sets of 8 repetitions each side, once daily. Supine with arms and legs at 90 degrees, the patient exhales fully, maintains ribcage depression, and extends the opposite arm and leg to just above the floor. The cue is that the lower back must not move — if it does, range should be reduced. This restores transversus abdominis timing without loading the hip joint. Supine pelvic floor activation with hip neutral is performed as 10-second holds for 10 repetitions, twice daily, with the cue to gently lift the pelvic floor as if stopping urination and then breathe normally. This restores the anticipatory activation pattern.

Progression to Phase 2 requires pain at or below 2/10 with all Phase 1 exercises, the ability to perform single-leg stance for 30 seconds without Trendelenburg, and clamshell 3 sets of 20 with full pelvic control.

Phase 2 spans weeks 3 through 8 and focuses on strength foundation and hip loading. For adductor loading, the Copenhagen adductor protocol begins with the short-lever Copenhagen plank: 3 sets of 8 to 12 repetitions, 3 times per week, starting with the bottom knee on a bench for support. This is the most evidence-supported exercise for adductor-related groin pain and has demonstrated significant injury prevention efficacy in field sport athletes. The cue is to maintain a straight line from ear to ankle with no hip drop. Progression to the long-lever version — straight leg — occurs when 3 sets of 12 are achieved without pain.

For gluteal strengthening, the single-leg Romanian deadlift is performed for 3 sets of 10 each side, 3 times per week, beginning with bodyweight and progressing to a 10 to 20 percent bodyweight dumbbell when form is consistent. The cue is to hinge at the hip, keep the stance knee soft, and feel the glute of the standing leg working throughout. This is a critical functional exercise because it loads the hip in the exact position where FAI and labral stress most commonly occur — end-range hip flexion under load. Lateral band walks are performed for 3 sets of 15 steps each direction, 3 times per week, with the band above the knees in a slight squat position. The cue is to maintain equal weight through both feet and not allow the knee to cave inward, progressing by increasing band resistance.

For hip flexor eccentric loading, eccentric iliopsoas lowering is performed for 3 sets of 8, twice per week. Standing, the patient lifts the knee to 90 degrees of hip flexion, then slowly lowers over 4 seconds. This addresses iliopsoas tendinopathy and restores eccentric control, with the cue to control the lowering rather than letting gravity do the work.

Progression to Phase 3 requires a single-leg squat to 60 degrees of knee flexion with no Trendelenburg, Copenhagen plank long-lever 3 sets of 10, and hip abduction strength at or above 85 percent of the contralateral side, measured with a handheld dynamometer if available.

Phase 3 spans weeks 8 through 16 or beyond and focuses on functional integration and return to activity. For power development, the lateral step-up with drive is performed for 3 sets of 12, 3 times per week, stepping up onto a 20 to 30 centimeter box and driving the opposite knee up to hip height at the top, progressing by adding 5 to 10 percent bodyweight when 3 sets of 12 are pain-free. The hip thrust progression begins with double-leg barbell hip thrust and advances to single-leg, with a target of single-leg hip thrust at 50 percent bodyweight for 3 sets of 10 before return to cutting and pivoting activities. Sport-specific loading begins with lateral shuffle and deceleration drills at 50 percent effort, progressing to 100 percent over a 4-week period, with monitoring for groin pain onset during and 24 hours after each session.

The 10 percent weekly load increase rule applies here with important modifications for groin pathology. Unlike knee or ankle swelling, which is easily measured, groin pain is best monitored through several parameters. Morning pain score on the NRS 0 to 10 before activity should be at or below 2/10 to proceed with the planned session. The 24-hour post-exercise pain response is also critical: if pain increases more than 2 points above baseline the following morning, load should be reduced by 50 percent and held for 48 hours before re-attempting. A traffic light system is useful for functional pain monitoring — green (0 to 2/10, proceed), amber (3 to 4/10, modify), red (5 or above, stop and reassess). The adductor squeeze test — isometric adductor squeeze in supine with knees bent, measured on a pressure biofeedback unit or pain provocation scale — should show progressive improvement week over week.

For FAI-specific loading, end-range hip flexion combined with adduction and internal rotation — the FADIR position — should be avoided under load until Phase 3. This is the impingement position, and premature loading in this range will provoke labral stress.

Return-to-activity criteria are drawn from current evidence in hip rehabilitation and sports medicine. Strength benchmarks, compared to the contralateral limb, include hip abduction strength at or above 90 percent symmetry, hip adduction strength at or above 90 percent symmetry, hip flexion strength at or above 85 percent symmetry, and an adductor-to-abductor ratio at or above 80 percent — lower ratios predict groin injury recurrence. Functional movement benchmarks include a single-leg squat of 5 repetitions to 90 degrees of knee flexion with zero Trendelenburg, zero knee valgus, and no pain; single-leg hop for distance at or above 90 percent limb symmetry index; triple hop for distance at or above 90 percent limb symmetry index; and Y-Balance Test anterior reach within 4 centimeters of the contralateral side. Activity-specific criteria include jogging 20 minutes pain-free before return to cutting and pivoting, full training participation without pain modification for 2 consecutive weeks before return to competition, and a patient-reported outcome measure score — using the HAGOS or iHOT-33 — at or above 80 out of 100.

A final point on diagnosis: this presentation requires imaging and clinical examination before committing to a rehabilitation pathway. An AP pelvis X-ray and lateral hip view will identify cam or pincer morphology. MRI arthrography with contrast is the gold standard for labral pathology. If femoral neck stress fracture is suspected — particularly in high-volume runners or athletes with relative energy deficiency — it must be ruled out before any loading program begins, as the consequences of a displaced femoral neck fracture are severe.

The rehabilitation protocol described above is appropriate for adductor-related groin pain, FAI without surgical indication, and athletic pubalgia. If imaging reveals significant labral tearing or FAI morphology that has failed 3 to 6 months of conservative management, surgical consultation is warranted, and the post-operative rehabilitation follows a different, more protected timeline. The majority of groin pain presentations in highly active adults respond well to targeted neuromuscular rehabilitation when the correct diagnosis is established.

The evidence base addressing groin pain in highly active adults is limited but clinically relevant. Athletic pubalgia, commonly called sports hernia, is a frequent yet poorly defined condition in active athletes that presents with groin and pubic pain. This presentation often overlaps with, or must be distinguished from, intra-articular hip disorders such as femoroacetabular impingement (PMID 33276883, PMID 32038025). Clinical examination and differential diagnosis of athletic pubalgia require systematic evaluation to separate it from other groin pain sources. Separately, a randomized controlled trial protocol examining multidisciplinary residential rehabilitation for non-arthritic intra-articular hip pain in military personnel suggests that structured, team-based conservative management may be more effective than conventional outpatient care for complex hip disorders in highly active populations (PMID 27821103).

Three studies form the basis of this summary. Coppack and colleagues (2016, BMC Musculoskeletal Disorders, PMID 27821103) published a Level 2 RCT protocol comparing multidisciplinary residential rehabilitation to conventional outpatient care for non-arthritic intra-articular hip pain in UK military personnel. The paper is relevant because it addresses treatment of non-arthritic hip disorders in a highly active population, though as a protocol paper it does not provide outcome data. Drager, Rasio, and Newhouse (2020, Arthroscopy: The Journal of Arthroscopic and Related Surgery, PMID 33276883) contributed a comprehensive review of athletic pubalgia presentation and treatment, characterizing it as a common yet poorly defined athletic injury driven by abdominal and groin pain, often arising from core muscle weakness. This review is directly relevant to differential diagnosis in active athletes, though it is limited to one condition and does not compare diagnostic accuracy against FAI or other differentials. Koutserimpas and colleagues (2020, Il Giornale di Chirurgia, PMID 32038025) reviewed clinical examination and differential diagnosis of athletic pubalgia in athletes, addressing the diagnostic challenge of distinguishing it from other groin pain sources, but providing limited quantitative evidence on the sensitivity or specificity of individual tests.

Several important gaps constrain the clinical utility of this evidence set. None of the three studies provide a head-to-head comparison of clinical tests — such as FADIR, FABER, or resisted adductor adduction — or imaging findings to differentiate FAI from athletic pubalgia, adductor strain, or labral pathology within the same cohort, meaning diagnostic accuracy data are entirely absent. The military focus of PMID 27821103 raises questions about generalizability to civilian athletes including runners, cyclists, and martial artists, while PMID 33276883 and PMID 32038025 address athletic pubalgia specifically without quantifying its overlap with intra-articular hip disorders. No studies in this set evaluate the diagnostic utility of MRI arthrography, intra-articular diagnostic injections, or imaging morphology indices such as cam or pincer measurements for FAI in active adults. Because PMID 27821103 is a protocol paper, no outcomes are reported, and no Level 1 evidence comparing conservative rehabilitation to surgical intervention such as hip arthroscopy for FAI in active adults is present in this set. Cross-referencing with AAOS Hip Impingement guidelines, AOSSM position statements on sports hernia, and APTA clinical practice guidelines for hip pain is recommended to assess guideline alignment, as this was not verified in the current search.