Answer:
The three biomechanical reasons why patellar problems occur are: instability, dislocation and dysplasia
Step-by-step explanation:
The criteria for a safe return to sports include the absence of pain, no effusion, a complete range of motion, stength and dynamic stability. This criteria can be applied in athletes threated with or without surgery. Ideally, patients should satisfy these criteria ate 6 weeks after a dislocation, and 3 months after surgery.