Do I need surgery, mri report  Marrow edema at the lateral femoral condyle margin and medial aspect of the patella with a small avulsed osteochondral fragment at the medial margin of the patella with partial tear of the adjacent medial retinaculum and marked adjacent soft tissue edematous changes. Findings are compatible with transient lateral patellar dislocation.   Shallow appearing trochlear groove at the level of the patellar articulation compatible with trochlear dysplasia. No evidence of patella alta or baja.  Hyperintense signal at the myotendinous junction of the vastus medialis muscle compatible with partial tear.  Moderate suprapatellar and knee joint effusion.  Fluid in the pes anserine bursa and edema along the posterior myofascial planes.  Grade II signal of medial collateral ligament.    Anterior cruciate ligament sprain.   Grade II signal in anterior horn of lateral meniscus. No evidence of tear.  Please correlate clinically.