Mandy, 50, has a history of OA in her knees and an ACL tear in her left knee many years ago. She has a concern for

Mandy, 50, has a history of OA in her knees and an ACL tear in her left knee many years ago. She has a concern for posterior left knee pain with hyperflexion over the last few weeks. Upon physical exam, you palpate a fullness in the posterior knee as you move her LLE from extension to flexion. The leg is not warm or erythematous. a. What is the most likely diagnosis? Provide your rationale. 1/2 point. b. What diagnostic modality would you utilize to confirm your diagnosis? Provide your rationale. 1/2 point