Isolated large chondral fracture of the knee presenting as an externally palpable loose body in an adolescent


      Osteochondral fractures are common among fractures of the knee joint in adolescents; however, isolated chondral fractures are uncommon. We report the case of a large full-thickness chondral fracture on the lateral trochlea of the left knee in a 12-year-old boy. A chondral loose body measuring 19 × 14 × 3.0 mm was removed arthroscopically. It was large and thick enough to be palpable from the outside. Histological examination of the removed cartilage revealed a thin layer of mesenchymal cells on the detached surface. Isolated chondral fractures of the knee are often difficult to diagnose preoperatively. Arthroscopy is the best means of diagnosing and treating these fractures.
      Arthroscopy: The Journal of Arthroscopic and Related Surgery, Vol 19, No 4 (April), 2003: pp E30–E30


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