20-year-old male with medial pain following valgus blow. Suggestion of MCL laxity and patellar apprehension. MENISCI: The medial and lateral menisci appear intact.ARTICULAR CARTILAGE AND BONE: There is edema along the anterolateral aspect of the lateral femoral condyle and a small focus of edema within the medial aspect of the patella, suggesting prior lateral dislocation of the patella. We see no full-thickness articular cartilage defects.LIGAMENTS: There is edema along the superficial band of the MCL that may represent a sprain. The meniscofemoral coronary ligament appears thickened and may be sprained as well. There is edema along the medial retinaculum as well as anterior to the MCL. The femoral attachment of the medial patellofemoral ligament is not well visualized suggesting a tear. There is also focal edema at the patellar insertion of the retinaculum likely representing additional tearing. The lateral retinacular structures appear intact. The LCL appears intact. The cruciate ligaments appear intact.EXTENSOR MECHANISM: The quadriceps and patellar tendons appear intact. The Insall Salvati ratio is between 1.4 and 1.5 indicating patella alta. ADDITIONAL
1. Findings indicating recent transient lateral patellar dislocation with injury to the medial retinacular structures. There is a patella alta deformity.2. MCL sprain without discrete tear.