A Case of Fracture of the Patella Resulting from Interesting Injury

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Fracture of the articular surface of the patella is uncommon. This paper reports a case of this rare fracture which we encountered lately.The patient was a 13 year old girl student who was admitted to our department on February 19, 1971. According to the patient's statement, she stood up on her tiptoes and twisted her left knee in the classroom for writing on a blackboard. Suddenly she had severe pain in her left knee and could not walk thereafter.In the physical examination, the knee showed tenderness, marked swelling with ballotement of the patella, pain in flexion, and limited range of motion. Roentgenographic studies of the knee showed a bone fragment between the patella and the medial condyle of the femur as well as partial defect of the articular surface of the patella. The excision of the fragment was done on the 12th hospital day and the fracture of the patella was confirmed.The limitation of the range of motion was gradually decreased postoperatively, and became almost normal on the 48th postoperative day. The pain and tenderness of the knee disappeared as well.
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