Knee Valgus

Dynamic Patterns - Lower Limb

Knee valgus (medial knee collapse) is one of the most prevalent and clinically significant dysfunctional movement patterns. It is characterized by medial drift of the knee during functional movements such as squatting, landing, or cutting. It is especially common in young women (2-8x higher) due to anatomical (increased Q-angle, narrower femoral notch), hormonal, and neuromuscular factors. It is also very common in beginners of both sexes and in athletes with poor motor control.

Biomechanical Mechanism

Dynamic valgus results from a combination of: (1) femoral internal rotation and adduction (glute med/max weakness or inhibition), (2) tibial internal rotation, (3) excessive foot pronation, and (4) possible medial arch collapse. The primary driver is inadequate eccentric control of femoral adduction/internal rotation during loading, creating a valgus moment at the knee and increasing stress on the ACL (up to 3x), medial meniscus, and patellofemoral cartilage.

Clinical Rationale

Knee valgus is a major risk factor for ACL injury, especially in female athletes (up to 8x higher). Early correction is critical. Most cases respond very well to neuromuscular training. The key is proper progression: activation → strength → motor control → functional integration. Do not skip phases.

Practical Solution

Level-based protocol: Beginners focus on isolated glute activation and proprioceptive awareness (4-6 weeks). Intermediates integrate bilateral and unilateral strength work (4-6 weeks). Advanced/athletes use controlled plyometrics and sport-specific drills (4-8 weeks). Frequency: 3-4x per week.

Common Compensations

• Compensatory tibial external rotation to keep the foot forward
• Increased hip flexion to reduce valgus moment
• Lateral trunk shift over the stance leg
• Excess foot pronation with medial arch collapse
• Quadriceps dominance over glutes and hamstrings

Progression

1. Level 1: Activation in stable positions (supine, quadruped)
2. Level 2: Bilateral closed-chain strengthening
3. Level 3: Unilateral control exercises
4. Level 4: Plyometrics and sport-specific movement

Regression

• Reduce squat range of motion
• Use external feedback (band around knees, mirror)
• Return to bilateral work if unilateral control breaks down
• Slow the movement tempo

Red Flags

• True knee instability (giving way)
• Recurrent joint effusion without clear cause
• Mechanical locking
• Severe pain with load (>7/10)
• Recent acute trauma

Differential Diagnosis

• ACL injury (compromised passive stability)
• Patellofemoral pain syndrome
• Patellar or quadriceps tendinopathy
• IT band friction syndrome
• Rotational knee instability

Related Patterns

• anterior pelvic tilt
• overpronation
• lateral pelvic tilt

Related Exercises

• clamshell
• monster walk
• lateral step band
• step down
• single leg hip thrust
• glute bridge
• tfl it band smr
• adductor smr
• side lying hip abduction
• single leg balance
• goblet squat
• overhead squat

Related Assessments

• overhead squat assessment
• single leg squat assessment
• drop jump landing assessment
• hip abduction strength assessment
• trendelenburg assessment

Evidence