A 20-year-old female presents with recurrent knee instability and a feeling of her knee "giving way". She has a history of an ACL reconstruction a year ago. Her physical exam reveals a positive anterior drawer test. What might be the problem, and what are your next steps?
The patient's history and physical exam are suggestive of a possible failure of the anterior cruciate ligament (ACL) graft, leading to recurrent instability. An MRI would be recommended to evaluate the integrity of the ACL graft. If the graft failure is confirmed, she may need revision ACL reconstruction.