Which of the following synovial plicae of the knee is most frequently symptomatic, potentially snapping over the femoral condyle and requiring arthroscopic resection?

Explanation:
The correct option is a. The medial patellar plica is the most frequently symptomatic plica in the knee. It can become thickened, fibrotic, and unyielding, snapping over the medial femoral condyle during knee flexion. This causes localized pain, catching, and potentially chondromalacia, necessitating arthroscopic excision when conservative management fails. Reference: Campbell's Operative Orthopaedics, 14th Edition.