What is a common history finding in an MCL injury?

What is a common history finding in an MCL injury?

• A. Direct trauma to the lateral aspect of the knee creating a valgus force with a rotational component
• B. Direct trauma to the medial aspect of the knee with a varus force
• C. Twisting injury with the knee in extension
• D. Direct blow to the medial knee without valgus force

Answer: (A)

Valgus stress on the knee is the typical history for an MCL injury. This usually comes from a direct blow to the lateral (outer) aspect of the knee, which forces the knee to move inward (valgus) and often involves a rotational component. That outside-to-inward force specifically loads and can tear the medial collateral ligament. Other scenarios don’t fit as well: a direct hit to the medial side with a varus force would stress lateral structures more than the MCL; a twisting injury with the knee in extension points more toward ACL or meniscal injuries; a direct blow to the medial knee without valgus stress is unlikely to cause an MCL tear.

Valgus stress on the knee is the typical history for an MCL injury. This usually comes from a direct blow to the lateral (outer) aspect of the knee, which forces the knee to move inward (valgus) and often involves a rotational component. That outside-to-inward force specifically loads and can tear the medial collateral ligament.

Other scenarios don’t fit as well: a direct hit to the medial side with a varus force would stress lateral structures more than the MCL; a twisting injury with the knee in extension points more toward ACL or meniscal injuries; a direct blow to the medial knee without valgus stress is unlikely to cause an MCL tear.