Groin Strain Recovery & Return to Sport

Introduction to Groin Strains in Athletes

Groin strains are highly prevalent injuries in sports that involve sudden acceleration, deceleration, rapid changes of direction, and forceful kicking, such as soccer, rugby, hockey, and basketball. A groin strain refers to a stretching or tearing injury of the adductor muscle group on the inner side of the thigh. While the group consists of five muscles (adductor longus, adductor brevis, adductor magnus, gracilis, and pectineus), the adductor longus is the most frequently injured due to its poor biomechanical leverage during rapid deceleration.

Historically, treatment relied on long periods of complete rest. However, modern physical therapy emphasizes early, active load-based rehabilitation. A structured program of physiotherapy and sports rehabilitation is essential to rebuild the muscle-tendon junction, prevent recurrence, and ensure a safe return to play.

The Clinical Approach to Recovery

Rehabilitation for an acute adductor strain is divided into distinct, goal-oriented phases:

Phase 1: Pain Control and Isometric Activation (Acute Phase)

The focus is on protecting the tissue while maintaining neuromuscular control. Modalities like ice and compression help manage swelling, while targeted exercises begin:

• Isometric Ball Squeezes (Three Positions): Lie on your back. Place a pilates ball or foam block between your knees. Squeeze the ball at 50% effort and hold for 10 seconds. Perform this at three different knee flexion angles: 0 degrees (legs straight), 45 degrees, and 90 degrees (knees bent). Squeezing at different angles recruits different portions of the adductor group. Repeat 5 times in each position, twice daily.
• Passive Range of Motion: Gentle, pain-free active-assisted groin stretches to maintain hip flexibility.

Phase 2: Progressive Strengthening and the Copenhagen Protocol (Subacute Phase)

Once isometric squeezes are pain-free, rehabilitation transitions to dynamic concentric and eccentric loading. The core of this phase is the Copenhagen Adductor Exercise, which has been shown in clinical trials to significantly increase adductor strength and prevent groin injuries.

The Copenhagen Adductor Exercise Progressions

• Level 1 (Easy): Lie on your side. Place your top leg on a bench or chair, supported at the knee. Lift your bottom leg up to meet the bench, raising your hips off the ground. Hold for 2 seconds and lower under control. Perform 2 sets of 10 repetitions on each side.
• Level 2 (Medium): Perform the same movement, but support the top leg at the ankle instead of the knee. This increases the leverage arm, placing greater load on the hip adductors. Complete 2 sets of 8 repetitions.
• Level 3 (Hard): Perform the level 2 exercise with a dynamic partner. The partner holds your ankle while you raise and lower your entire body, slowly controlling the descent (eccentric loading). Perform 3 sets of 8-10 repetitions.

Copenhagen Adductor Exercise Progression Table

| Level | Setup (Support Point) | Movement Action | Primary Muscle Loaded | Target Sets & Reps | | :--- | :--- | :--- | :--- | :--- | | Level 1: Beginner | Side-lying; top leg supported at the knee on bench | Raise bottom leg to meet bench while lifting hips | Proximal hip adductors | 2-3 sets of 10-12 reps | | Level 2: Intermediate | Side-lying; top leg supported at the ankle on bench | Raise bottom leg to meet bench; lift hips with long lever | Full adductor longus chain | 2-3 sets of 8-10 reps | | Level 3: Advanced | Side-lying; partner supports ankle at shoulder height | Dynamic raising and lowering of torso/lower leg | High-load eccentric adductors | 3 sets of 8-12 reps |

Kinetic Chain and Pelvic Stability

Groin pain is rarely an isolated issue. Weakness in the core and gluteal muscles (specifically the gluteus medius) leads to pelvic instability during running. When the pelvis drops or rotates excessively, the adductors must contract harder to stabilize the hip, leading to chronic overload. Clinicians must integrate gluteal strengthening (side planks, lateral band walks) and core stability drills alongside adductor exercises. For athletes with severe groin irritation, clinical pain management tools like deep dry needling or manual therapy can help restore normal tissue tone.

Criteria for Return to Sport

Returning to play too early is the primary cause of chronic groin pain. Athletes must pass the following functional tests before returning to competitive matches:

• Adductor Squeeze Test: Pain-free squeezing of a blood pressure cuff placed between the knees, achieving at least 90% of the baseline/pre-injury pressure.
• Strength Symmetry: Handheld dynamometer testing showing adductor strength is within 90-100% of the uninjured leg.
• Adductor-to-Abductor Ratio: Adductor strength should be at least 80% of abductor (gluteal) strength.
• Functional Drills: Successful completion of maximum-effort sprinting, cutting (90-degree turns), and kicking drills without residual pain or stiffness 24 hours post-exercise.