KMID : 0191119980130040431
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Journal of Korean Medical Science 1998 Volume.13 No. 4 p.431 ~ p.433
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Fracture originated at the tip of heterotopic ossification of femur by minor external force: report of two cases
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Yim SY
Yoon SH/Lee IY/Rah UW/Moon HW
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Abstract
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Fracture of femur without evidence of severe osteoporosis rarely occurs as a result of minor external force such as a gentle passive or an active range of motion exercises. We report two cases of femoral shaft fracture occurred at the tip of heterotopic ossification of femur by a minor external force, in which the involved femur shows no evidence of remarkable osteoporosis. The possible mechanism inferred by authors is as follows: 1) heterotopic ossification limits range of motion of the hip joint; 2) a new lever arm is formed at the tip of heterotopic ossification where energy can be concentrated; 3) therefore, fractures develop even by a minor external force. Search for similar cases and further discussions on possible mechanisms and prevention of femoral fractures in patients with heterotopic ossification will be necessary.
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KEYWORD
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