Clinical Analysis: Medial Knee Pain with Hyperextension, Abolished by Dorsiflexion

The Key Clinical Clue: The Dorsiflexion Modifier

• The gastrocnemius originates from the posterior medial femoral condyle, crossing both the ankle and the knee joint.
• When the ankle is in plantarflexion or neutral (no dorsiflexion) and the knee is hyperextended, the gastrocnemius is placed under maximal stretch - pulling from its medial femoral origin downward.
• When you add dorsiflexion, the ankle end of the gastrocnemius is taken up ("shortened" at the distal end), reducing tension on the muscle and relieving the traction stress at its medial femoral origin.
• This is the same biomechanical logic behind the Silfverskiold test, which evaluates isolated gastrocnemius contracture: dorsiflexion improves with knee flexion (or distal decompression) because the gastrocnemius is relaxed.

"Improvement in ankle dorsiflexion with knee flexion (relaxing the gastrocnemius origin proximal to the knee) indicates isolated gastrocnemius contracture" - Miller's Review of Orthopaedics, 9th Ed.

Most Likely Diagnosis

• Is reproduced by maximal stretch of the gastrocnemius (hyperextension + no ankle dorsiflexion)
• Is relieved when ankle dorsiflexion shortens the gastrocnemius distal end
• Does NOT cause pain on weight bearing (because standing/walking rarely puts the knee into full hyperextension)

Secondary Consideration: Posteromedial Capsule Stress

"The posteromedial capsule along with the posterolateral capsule provide major resistance against knee hyperextension, with the cruciate ligaments serving a lesser role in this function."

Differentials to Consider (Lower Probability Given the Pattern)

Examination Recommendations

1. Palpate the medial femoral condyle posteriorly - tenderness at the gastrocnemius origin confirms the diagnosis
2. Silfverskiold test - compare dorsiflexion with knee extended vs. flexed; restriction improves with knee flexion = isolated gastrocnemius tightness
3. Reproduce the pain actively - ask patient to actively plantarflex against resistance with the knee extended; if this reproduces medial knee pain, gastrocnemius origin is confirmed
4. Posterior drawer test - rule out PCL if history of trauma
5. Joint line palpation - assess for meniscal tenderness

Management

• Stretching of the gastrocnemius with knee extended and progressive eccentric loading
• Heel raises to offload the gastrocnemius during the acute phase
• Activity modification - avoid positions of knee hyperextension
• If tendinopathy confirmed: physiotherapy with eccentric strengthening, possible ultrasound-guided injection to the gastrocnemius origin if refractory
• MRI of the posterior medial compartment if symptoms persist, to rule out partial-thickness gastrocnemius origin tear

Physiotherapy Management: Medial Gastrocnemius Origin / Posteromedial Knee

Phase 1 - Acute / Protection (Days 1-3)

• Apply the POLICE principle (Protection, Optimal Loading, Ice, Compression, Elevation) for the first 24-48 hours
• Avoid positions that reproduce pain - specifically knee hyperextension without ankle dorsiflexion
• Heel raises bilaterally inside footwear to reduce stretch on the gastrocnemius at rest
• Partial weight bearing as tolerated; crutches if normal gait is compromised

• Pulsed therapeutic ultrasound (0.5-1 W/cm²) to the posteromedial femoral condyle origin
• Low-level laser therapy (LLLT)
• Transcutaneous electrical nerve stimulation (TENS) for pain control
• Note: Avoid these modalities in the first 72 hours due to their heating effects on acutely injured tissue

• Active, pain-free range of motion (ROM) at the ankle and knee within a comfortable range
• Isometric plantarflexion (no stretch, no pain)
• No stretching in this phase - stretching the gastrocnemius at this stage can aggravate the proximal origin

• Deep tissue massage or soft tissue mobilization (may cause further bleeding)
• Passive stretching into dorsiflexion with knee extended
• Heat application in first 72 hours

• Swelling resolved
• Pain-free active and passive ROM within safe range
• Isometric plantarflexion without pain
• Walking without pain with normal gait pattern

Phase 2 - Subacute / Early Loading (Days 3-14)

• Gentle soft tissue mobilization and massage can now begin (no longer contraindicated)
• Myofascial release to the medial gastrocnemius and hamstrings

• Non-weight-bearing gastrocnemius stretch with towel - supine, knee extended, towel around forefoot, gently pull into dorsiflexion. Low load, long duration (30-60 seconds). This is the key stretch - it directly addresses tightness at the medial gastrocnemius origin.
• Begin with knee flexed to reduce tension on the proximal origin, then gradually progress to knee extended as tolerated

• Double-leg calf raises (concentric) - high velocity, low load initially
• Progress to single-leg calf raise when pain-free
• Progress to loaded exercises (weighted calf raises, leg press)
• Stationary cycling is well tolerated at this stage

• Ultrasound with phonophoresis
• Electrotherapy / muscle stimulation
• Ice post-exercise (15-20 min)

• Pain-free double-leg calf raise x 20 repetitions
• Walking without pain on varied terrain

Phase 3 - Functional Loading (Weeks 2-4)

• Weight-bearing gastrocnemius stretch (wall lean) - both with knee extended and knee flexed
• Importantly, now practice the stretch without dorsiflexion first to gradually desensitize the provocation pattern, then add dorsiflexion
• Static holds 30-60 seconds, 3 sets

• Deep transverse friction massage (Cyriax technique) at the medial gastrocnemius origin on the posterior medial femoral condyle - this enhances tissue remodeling and regeneration

• Eccentric calf lowering (stand on edge of step, lower slowly) - this is the cornerstone exercise for tendinopathy remodeling based on evidence for progressive loading in tendinopathy (Pavlova et al., 2023, BJSM)
• Leg press with progressive load
• Hamstring curls (protecting the posteromedial knee structures)
• Step-ups, mini-squats progressed to single-leg squat

• BAPS (Biomechanical Ankle Platform System) board in full weight bearing - with and without posterior peg overload
• Balance training on unstable surface
• Single-leg stance progressions

• Gradually reduce heel raise height and normalise foot strike pattern
• Treadmill walking with therapist observation of knee control in terminal stance

• Jogging and light running without pain
• Phase 3 exercises with minimal to no pain

Phase 4 - Sports/Function Return (Weeks 4-6+)

• Combination of static, dynamic, and ballistic stretching of the gastrocnemius-soleus complex

• Single-leg stance on BAPS board
• Single-leg Romanian deadlift
• Single-leg windmill touches
• Single-leg two-arm chest press (rotational challenge)
• Progress complexity and speed

• Double-leg jumps → single-leg hops
• Lateral hops
• Sport-specific drills

Adjunctive / Supportive Measures Throughout

What NOT to Do

• Passive stretching in the first 72 hours
• Deep friction massage in the acute phase
• Hyperextension exercises or positions that replicate the pain provocation
• Aggressive strengthening before adequate pain-free ROM is restored

Summary of Exercise Progression

Isometric → Isotonic (concentric) → Isotonic (eccentric) → Plyometric → Sport-specific