Published online Sep 6, 2022. doi: 10.12998/wjcc.v10.i25.9020
Peer-review started: March 20, 2022
First decision: June 16, 2022
Revised: June 29, 2022
Accepted: July 27, 2022
Article in press: July 27, 2022
Published online: September 6, 2022
Processing time: 158 Days and 23 Hours
Discoid meniscus is a congenital anomaly that typically affects the lateral meniscus. The appearance of the discoid medial meniscus in both knees is extremely rare, with an incidence of only 0.012%.
Our patient was a 30-year-old female. Under no obvious predisposing causes, she began to experience pain in both knees, which worsened while walking and squatting. The pain was aggravated after exercise, and joint flexion and extension activities were accompanied by knee snapping. Apley’s test was positive on physical examination, and there was a pressing pain in the medial articular space. Plain radiographs of both knees revealed no obvious abnormalities in the bilateral knee joint space. Partial meniscectomy as well as menisci reformation were performed on both knees under arthroscopy. Under the guidance of rehabilitation, the patient’s range of motion in both knees returned to normal without pain and knee snapping.
This study showed that the clinical manifestations of the discoid medial meniscus injury are identical to those of the conventional medial meniscus injury, and arthroscopic surgery is effective.
Core Tip: Discoid medial meniscus is very rare, and the bilateral discoid medial meniscus is extremely rare. We present the case of a 30-year-old female with features of a meniscal tear in two symptomatic knees and radiographic findings of discoid menisci in both knees. A provisional diagnosis of bilateral discoid medial menisci was made. Magnetic resonance imaging confirmed the discoid nature of the medial menisci in both knees. Both knees underwent partial meniscectomy and menisci reformation by arthroscopy. After 6 mo of follow-up, the patient had good clinical and functional outcomes.