Abstract
This case report concerns an intraarticular bone tumor of the knee joint causing loss of flexion. A 41-year-old man complained of pain and loss of flexion in his right knee joint. He was diagnosed with degenerated lateral meniscus and treated. However, the symptoms didn't improve. After 3 years, resection of the bone tumor on intracondylar notch of distal femur resulted in an improvement from a pre-operative loss of flexion of 60° to 135° after surgery. This tumor was diagnosed as osteoma in the histopathological study.
The lateral meniscus was discoid and degenerated, and the tumor was not found on X-ray film (A-P, lateral view). Thus, diagnosis of loss of flexion caused by osteoma was uncharacteristically delayed. An MRI was used to help understand the tumor.
