Badminton Adductor Longus Groin Strain and Copenhagen Protocol Rehabilitation
In short
Rapid lateral lunges and split-second court directional changes subject the adductor longus to acute eccentric stretch. The Copenhagen protocol restores groin integrity.
In this guide (7 sections)
Badminton demands constant explosive lateral change of direction (COD). Players frequently execute deep lateral lunges toward the sidelines to retrieve smashes, requiring the trailing adductor longus to act as a powerful mechanical brake while simultaneously stabilizing the pelvis. Acute adductor longus strains occur at the proximal myotendinous junction near the pubic ramus during sudden eccentric lengthening. Inadequate eccentric adductor strength relative to the abductors creates an adductor-to-abductor ratio below 80%, leaving the groin highly vulnerable to recurrent tearing.
Domestic Indian Sports Reality and Field Conditions
In Indian badminton centers, training regimens often focus intensely on cardiovascular drills and stroke repetitions while neglecting isolated hip adductor conditioning. Many players perform generic static butterfly groin stretches, mistakenly believing flexibility prevents strains. When competing on high-traction synthetic courts, a sudden foot slip on sweat or an overstretched lateral lunge forcefully abducts the loaded hip. Due to tournament schedules where players play both singles and doubles events on consecutive days, low-grade adductor soreness frequently progresses into chronic longus tendinopathy or osteitis pubis.
Biomechanics and Pathomechanics of Injury
Biomechanical research reveals that the adductor longus experiences its highest tensile strain during the transition from maximal hip abduction and external rotation into explosive concentric adduction and flexion. When changing direction, the player plants the foot laterally; the adductor longus must contract eccentrically to prevent excessive hip flare and stabilize the pubic symphysis. If ground reaction forces overpower the muscle's eccentric capacity, tensile failure occurs at the vulnerable proximal bone-tendon junction, producing immediate sharp groin pain.
Clinical Assessment and Provocative Special Tests
- Squeeze Test at 0°, 45°, and 90° Hip Flexion: The patient lies supine and forcefully squeezes a blood pressure cuff or fist between the knees. Testing at 45 degrees isolates the adductor longus. Reproduction of groin pain or reduced squeeze pressure (<200 mmHg) confirms adductor strain.
- Resisted Adduction in Outer Range: With the hip abducted to 30 degrees, resisted isometric adduction sharply reproduces localized pain at the pubic origin.
- FABER (Patrick) Test: Assesses hip joint pathology (femoroacetabular impingement or labral tear) to ensure groin pain is not referred from intra-articular hip pathology.
Stage-by-Stage Functional Return Protocol
- Phase 1: Acute Protection and Submaximal Isometrics (Days 0 to 5): Rest from lateral movements. Perform supine bilateral ball squeezes with knees flexed to 45 degrees at submaximal, pain-free effort. Apply compression shorts and utilize ice for pain modulation.
- Phase 2: Progressive Copenhagen Adduction Progression (Weeks 1 to 4): Introduce the validated Copenhagen Adduction protocol, progressing from bent-knee partner-supported variations to full-lever straight-leg holds to rebuild high-threshold eccentric adductor strength.
- Phase 3: Dynamic Multi-Planar Lunging and Deceleration (Weeks 4 to 7): Advance to sliding side lunges, skater bounds, and resisted lateral shuffling using elastic bands. Recondition the core-pelvic ring with side planks and Pallof presses.
- Phase 4: Badminton-Specific Court Footwork and Match Clearance (Weeks 7 to 10): Perform high-intensity 6-corner corner footwork drills. Clearance criteria require a pain-free maximal squeeze test, adductor-to-abductor strength ratio >90%, and full lateral sprint tolerance.
The Copenhagen Adduction Exercise (Level 2 Progression)
Objective: Builds exceptional eccentric adductor longus strength and restores pelvic ring stability to prevent re-injury.
- 1Lie on your side in a side-plank position, supporting your upper body on your forearm.
- 2Have a partner support your top leg at the knee (or place the inside of your top knee on a padded gym bench).
- 3Keep your bottom leg hanging freely below.
- 4Raise your body off the floor so your torso and top leg form a straight plank, then simultaneously adduct the bottom leg upward to touch the top leg.
- 5Lower your body smoothly back toward the floor over a 3-second eccentric tempo.
- 6Keep your hips pushed forward in neutral extension throughout.
Copenhagen Adduction Progression Stages
| Level / Stage | Partner / Bench Placement | Lever Length | Target Repetitions | |
|---|---|---|---|---|
| Level 1 (Beginner) | Supported at the knee | Short lever (bent knee) | 2 sets of 10-12 reps per side | |
| Level 2 (Intermediate) | Supported at mid-tibia | Medium lever | 3 sets of 8-10 reps per side | |
| Level 3 (Advanced) | Supported at the ankle | Full long lever (straight leg) | 3 sets of 12-15 reps per side |
Red Flag Signs Requiring Immediate Medical Referral
A palpable gap or visible bulging near the pubic tubercle, severe pain on coughing or sneezing, or deep groin pain radiating into the testicular or perineal region indicates a possible sports hernia (athletic pubalgia), inguinal hernia, or complete adductor avulsion requiring specialist surgical evaluation.
Frequently Asked Questions
Why do adductor groin strains have such a high recurrence rate in badminton?
Groin strains frequently recur because players return to the court as soon as resting pain subsides, long before eccentric adductor strength is restored. Without completing a progressive loading protocol like the Copenhagen exercises, the weakened muscle tears upon the first aggressive lateral lunge.
Can wearing compression shorts help prevent badminton groin strains?
Targeted sports compression shorts provide mechanical warmth and proprioceptive awareness, which can reduce the perception of muscle soreness. However, true prevention requires maintaining an adductor-to-abductor strength ratio above 90%.
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