# Case Report: Dislocation of lateral menisci secondary to congenital lateral tibiofemoral cartilage thickening in both knees

## TL;DR

A 24-year-old man experienced knee pain due to a rare condition where thickened cartilage caused lateral meniscus dislocation in both knees.

## Contribution

This case report introduces a new variant of knee joint pathology involving congenital cartilage thickening leading to meniscus dislocation.

## Key findings

- MRI showed bilateral thickened tibiofemoral cartilage with subchondral bone deformities.
- Dislocation of the lateral menisci into the intercondylar notch was observed bilaterally.
- The condition was linked to congenital lateral cartilage thickening, not typical meniscus tears.

## Abstract

A 24-year-old male patient complained of mild knee pain after jogging. The subsequent knee MRI demonstrated bilateral lateral thickened tibiofemoral cartilages, evidenced by deformities of the bilateral subchondral bone beneath the lateral femoral condyle cartilage. The corresponding dislocations of almost all the left lateral meniscus and part of the right lateral meniscus to the center of the joint were detected. After excluding diagnoses of congenital ring-shaped meniscus, bucket handle tear of the C-shaped lateral meniscus, and central tear of the discoid meniscus, the displacement of all or part of the lateral meniscus into the intercondylar notch was considered a consequence of congenital thickening of the lateral superior and inferior cartilage. This case may report a new variant of knee joint pathology.