Unhappy triad involves injuries to which structures?

Unhappy triad involves injuries to which structures?

• A. ACL, PCL, Lateral Meniscus
• B. ACL, MCL, Medial Meniscus
• C. MCL, LCL, ACL
• D. ACL, MCL, Lateral Meniscus

Answer: (B)

The unhappy triad is a knee injury pattern where the ACL, the MCL, and the medial meniscus are damaged. This typically happens when a force drives the knee inward (valgus) with a twist while the foot is planted. That valgus and rotational stress simultaneously strains the ACL and MCL and shears the medial meniscus between the femur and tibia. Because the mechanism targets the medial side, the medial meniscus is involved, not the lateral meniscus, and the posterior cruciate ligament or lateral ligaments aren’t part of this classic triad. So the combination of ACL, MCL, and medial meniscus best fits this scenario.

The unhappy triad is a knee injury pattern where the ACL, the MCL, and the medial meniscus are damaged. This typically happens when a force drives the knee inward (valgus) with a twist while the foot is planted. That valgus and rotational stress simultaneously strains the ACL and MCL and shears the medial meniscus between the femur and tibia. Because the mechanism targets the medial side, the medial meniscus is involved, not the lateral meniscus, and the posterior cruciate ligament or lateral ligaments aren’t part of this classic triad. So the combination of ACL, MCL, and medial meniscus best fits this scenario.