Adductor Strain / Groin Pain — The Verdict Research

Red Flags — When to Stop and Refer

Groin pain can mimic serious non-musculoskeletal conditions. Screen for these before starting any rehabilitation.

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Can't walk / PPPT positive / deep aching that started gradually → Non-weight-bearing status + urgent MRI/CT. Pubic ramus or femoral neck stress fracture until proven otherwise.

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Testicular swelling, pain, or fever alongside groin pain → A&E immediately. Testicular torsion is a surgical emergency. Do not attempt physio.

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Bulge in the groin that gets bigger when you cough or strain → Surgical consult. True inguinal hernia requires surgical repair, not physiotherapy.

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Groin pain + leg tingling, numbness, or foot weakness → Assess lumbar spine first. This is likely referred nerve root pain, not an adductor problem.

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Unrelenting night pain + unexplained weight loss → Urgent GP referral. Rule out malignancy or avascular necrosis.

Do This Now

Stop stretching it. Start loading it.

Put a firm pillow between your knees, squeeze gently for 10-30 seconds, 3-5 sets. Do this daily. Isometric loading is the starting point — passive stretching is contraindicated for long-standing adductor tendon problems and actively makes it worse.

The Verdict

Active loading beats rest by 5:1 — and stretching is the worst thing you can do for a chronic groin problem.

The Analogy

Think of the adductor tendon like a fraying rope. If you pull the ends apart (stretch it), you accelerate the fraying. If you apply controlled tension at the right angle and progressively increase the load, the rope rebuilds itself with thicker, stronger fibres. That's mechanotransduction — and it's why the Copenhagen Adductor Exercise works and passive rest doesn't.

1

Active exercise achieves 79% pain-free return to sport vs 14% with passive physiotherapy — a 5:1 advantage that has been replicated in multiple studies.
2

Stretching is contraindicated for long-standing adductor tendinopathy — it increases compressive load at the pubic bone insertion and breaks down already disorganised tendon fibres.
3

Pain during exercise is acceptable up to 3-4/10 — what matters is the morning-after test. If your pain is gone by the following morning, you loaded correctly. If it's worse, you overdid it.

Best for

Athletes and recreational gym-goers with acute adductor strains or chronic groin pain from sport. Works across all activity levels — sedentary to competitive.

Skip if

Any red flag is present (stress fracture, hernia, urological symptoms, neurology). These require different management — see red flags above.

Understand the mechanism and evidence behind this? See the full research breakdown ▾

Assessment

Diagnosis: Both criteria must be positive

Adductor Squeeze Test (90° hip flexion)

Squeeze sphygmomanometer/ball between knees. Score <225 mmHg = elevated injury risk. Objective measurement tracks rehab progress.

Sn 85%

Sp 45-57%

Palpation — Adductor Longus Origin

Direct palpation at inferior pubic ramus. High negative LR (0.11) — if pain-free, rules out adductor pathology with strong confidence.

Sn 93-94%

Sp 89%

Distinguish: Acute Strain vs LARGP

Both present with adductor-positive tests — but the management timeline and priorities differ significantly.

ACUTE STRAIN

Sudden mechanism (kick, sprint, tackle). Clear onset. MTJ typically involved. 2-6 week timeline.

LARGP (CHRONIC)

Insidious onset over weeks/months. Tendon insertion. Morning stiffness. 3-6 month timeline. Stretching contraindicated.

MRI Grading (BAMIC) — When to Image

Only indicated if Grade 3+ avulsion is suspected, symptoms persist >6 weeks, or stress fracture cannot be excluded clinically.

BAMIC Grade	Description	RTP Timeline (elite)
Grade 1-2 (Myofascial/MTJ)	<50% CSA, <15cm disruption	13-21 days
Grade 3c (Intratendinous)	>50% CSA, tendon involvement	55-78 days
LARGP (Chronic enthesopathy)	Failed healing, degeneration	3-6 months

Treatment Hierarchy

Tier 1 — Strong Evidence

Copenhagen Adductor Exercise (CAE)

The most evidence-backed exercise in sports physiotherapy for groin injuries. 41% injury prevention in professional football (n=240). 36% increase in eccentric adduction strength in 8 weeks. Partner-assisted side-plank: concentric adduction (3s up), eccentric lowering (3s down).

Weeks 1-21-2 sets × 3-6 reps/side, 2x/week. Short lever (partner holds knee).

Weeks 3-41-2 sets × 7-10 reps/side, 3x/week.

Weeks 5-81-3 sets × 12-15 reps/side, 3x/week. Long lever (partner holds ankle).

Tempo3s concentric / 3s eccentric. Pain guide: ≤3/10 during, 0/10 next morning.

Tier 1 — Strong Evidence

Hölmich Multimodal Active Protocol

Designed specifically for LARGP. Combines adductor strengthening + lumbo-pelvic stability + hip abductor work. OR=12.7 vs passive physiotherapy (79% vs 14% return to sport pain-free). 8-12 weeks, 3 supervised sessions/week.

ComponentsIsometric adduction (ball at knees/ankles), side-lying adduction/abduction, cable skiing simulations, balance board, abdominal crunch variations

Volume3-4 sets × 10-15 reps per exercise, progressive resistance over 8-12 weeks

Tier 2 — Moderate Evidence

Blood Flow Restriction (BFR) Training

Early-phase solution when traditional loading is too provocative. Creates hypoxic anabolic environment at 20-30% 1RM — matches high-load hypertrophic stimulus. Apply during side-lying adduction, bridges, or squats.

Pressure60-80% Limb Occlusion Pressure (LOP) / 160-200 mmHg at proximal thigh

Dosing4 sets: 30-15-15-15 reps. 30-sec rest between sets (cuff stays inflated during rest).

Frequency2-3x/week for 4 weeks. Must be at 0-2 RIR for hypertrophic stimulus at low load.

Tier 3 — Adjunct / Emerging

Extracorporeal Shockwave Therapy (ESWT)

Moderate pain-modulating benefit when combined with active loading. Exceeds MCID for HAGOS scores in LARGP. Never standalone — always concurrent with exercise protocol.

What Doesn't Work

Passive rest alone — 14% return to sport vs 79% with active exercise. Causes atrophy and reduces tendon stiffness without stimulating remodelling.
Hip flexor / adductor stretching — CONTRAINDICATED for LARGP. Increases compressive load at the proximal insertion and accelerates the tendinopathic continuum.
Corticosteroid injection as primary treatment — Short-term analgesia only. Does not restore tissue capacity. Masks pain and enables premature return to sport, worsening the condition.
Ultrasound / TENS / Laser — No demonstrated long-term functional benefit for adductor pathology.

Full Exercise Protocol

Phase 1 — Acute / High Irritability

Isometric Ball Squeeze

Sets/Reps: 3-5 × 10-30 sec holds

Intensity: Submaximal (pain <3/10)

Frequency: Daily

Progress when: Pain-free 45-sec hold at max contraction

Phase 2 — Subacute / Mid

BFR Low-Load Adduction

Sets/Reps: 4 × 30-15-15-15

Intensity: 20-30% 1RM, 60-80% LOP

Frequency: 2-3x/week

Progress when: RPE <6, ready for mechanical load

Phase 3 — Mid / Remodelling

Copenhagen Adductor Exercise (Short → Long Lever)

Sets/Reps: 2-3 × 8-15

Intensity: Bodyweight, 3s/0/3 tempo

Frequency: 2-3x/week

Progress when: 3×15 pain-free short lever → move to long lever

Phase 4 — Late / Chronic Tendinopathy

Heavy Slow Resistance (HSR) Cable Adduction

Sets/Reps: 3-4 × 8-10

Intensity: 70-85% 1RM, 3s/1s/3s tempo

Frequency: 3x/week

Progress when: Meets sport-specific torque requirements

The Morning-After Test

Pain during exercise should not exceed 3/10. Pain MUST be 0/10 by the following morning. If morning pain has worsened, regress volume by 50% for 3-5 days, then progress more conservatively. This one rule guides the entire loading progression.

Recovery Timeline

2-3 weeks

Acute Strain — Grade 1-2 (MTJ involvement)

Criteria-based rehab produces 95% return to activity. Median clinical pain-free: 13 days. Full training: 18-21 days.

8-12 weeks

Acute Strain — Grade 3 (Tendinous / Intratendinous)

Tendinous involvement = significantly prolonged recovery. Median clinical pain-free: 55 days. Full training: 78 days. 21% reinjury rate if criteria not met before return.

3-6 months

Long-Standing ARGP (LARGP)

Chronic tendinopathy with enthesopathic change. 79% return to sport with structured Hölmich protocol (8-12 weeks). Concomitant pubic bone marrow oedema extends timeline to 9 months. Continue loading even after symptoms resolve — tendon remodelling outpaces pain reduction.

Prognostic flags

Factors that predict delayed recovery

Intratendinous MRI classification ('c' suffix), large tissue gap, duration >6 weeks before rehab starts, adductor strength deficit >20%, prior groin injury.

Return-to-Training Criteria

All criteria must be met — not just time elapsed. The 21% reinjury rate occurs almost entirely in athletes who return on a timeline, not on criteria.

Full passive and active hip ROM without groin pain All planes — particularly hip abduction and combined FABER.
Adductor squeeze force ≥ 225 mmHg or ≥ 80-90% of contralateral limb Measured via sphygmomanometer or handheld dynamometer. Bilateral presentations: use HAGOS functional scores instead.
Completes 3 × 15 short-lever Copenhagen Adductor Exercise with 0/10 pain This is the gating exercise — passing this before returning to sport is non-negotiable.
Pain-free straight-line jogging for 20 consecutive minutes Morning-after test passes — 0/10 pain the day after the run.
No resting pain or sleep-disrupting pain for ≥ 2 consecutive weeks
Competitive athletes only: >90% eccentric adductor strength symmetry + pain-free maximal sprint + psychological readiness >80%

Evidence Conviction

MODERATE

The superiority of active over passive management is STRONG and consistent. Specific exercise protocols (CAE, Hölmich) are well-validated in elite male athletes. The gap is in recreational adult populations — all major RCTs use professional football and ice hockey players, so precise dosing timelines may need adjustment for non-elite clinical populations.

What would change this to HIGH: A multi-center RCT comparing HSR vs. Copenhagen Adductor Exercise in recreational adults aged 30-55 with MRI-confirmed LARGP, powered for HAGOS outcomes at 16, 24, and 52 weeks — specifically in non-elite populations where evidence is extrapolated rather than demonstrated.

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Key References

Weir A et al., 2015 (BJSM) — Doha Agreement terminology and classification of groin pain in athletes. Foundational taxonomy: adductor-, iliopsoas-, inguinal-, pubic-, hip-related entities.

Hölmich P et al., 2010 (AJSM) — Active strengthening vs passive physiotherapy for LARGP: 79% vs 14% return to sport pain-free (OR=12.7). n=68. The landmark trial that established active management.

Harøy J et al., 2019 (BJSM) — Copenhagen Adductor Exercise RCT: 41% injury prevention in professional football. n=240 players.

Serner A et al., 2020 — Criteria-based return to play for acute adductor strains: 5% vs 21% reinjury rate (criteria-compliant vs non-compliant). Median RTP 13 days (BAMIC 0-2) vs 78 days (Grade 3).

British Athletics Muscle Injury Classification (BAMIC) — MRI grading for acute muscle/tendon injuries. Suffix 'c' (intratendinous) = significantly prolonged recovery vs 'a' (myofascial).

Bulbuli et al., 2025 — BFR low-load adductor protocol: 30-15-15-15, 60-80% LOP, 3x/week. Applied to proximal thigh during adduction exercises.

Ma 2024 (meta-analysis, 20 RCTs) — BFR at 20-40% 1RM produces hypertrophy comparable to high-load training. Informs BFR use in acute groin rehab.

Bizet 2025 — Eccentric exercise at lengthened position: +8.5% fascicle lengthening vs 0% at short length. Mechanistic basis for 3s eccentric CAE tempo.

Adductor Strain
& Groin Pain

Red Flags — When to Stop and Refer