VALGUS COLLAPSE OF THE KNEE
Valgus collapse, defined as adduction and internal rotation of the femur combined with external rotation and abduction of the tibia. Essentially the upper leg moves towards the other leg while the lower leg moves away. The combination of these movements creates an immense amount of strain on the knee joint. At lower speed activities (ie distance running) we will see repetitive stress injuries to the meniscus, cartilage (especially at the patella-femoral joint), and soft tissue injuries (ITB syndrome, quad/hamstring tendinitis). At higher speed activities (soccer, football…) we will see excessive valgus collapse result in non-contact tears of the MCL, ACL, and/or meniscus. Thus, it is imperative that any lower extremity rehab/training program incorporate strategies to correct/prevent the most common causes of valgus collapse. In most cases VC is caused by weakness or inhibition in the glute muscles, primarily gluteus medius. Structural issues with the hip joint itself, such as dysplasia, may also contribute to VC. On the other end we look at the foot/ankle for further causes of VC. Weakness in the muscles that control the arch of the foot (tib ant/post and intrinisic foot flexors) may also lead to collapse as the arch falls pulling the foot and ankle towards the ground. Excessive tightness in the calf or limitations in ankle mobility may also lead to VC through compensation patterns that include rotating the foot and lower leg outwards. Other causes such as excessive tightness in the adductor muscles, weak/imbalance in the core, or poor proprioception/balance may also contribute to VC. Regardless of the cause if you see this pattern in yourself or others it is important to get evaluated to determine the source and get on the right corrective strategies to avoid potential injury.
If you are experiencing valgus collapse of the knee and would like to learn more please contact us.
FORREST HARTFORD, DC, DACBSP, CCSP
Sports Chiropractor
