What is injured in an unhappy triad injury?

An unhappy triad injury involves three key injuries that occur simultaneously, typically due to a forceful blow to the knee. Specifically, it affects the anterior cruciate ligament (ACL), the medial collateral ligament (MCL), and the medial meniscus. This triad of injuries is common in sports-related incidents where the knee is twisted while the foot is planted. Prompt diagnosis and treatment are essential for recovery and to prevent long-term complications.