Authors: Hiroyuki Hatanaka Takuaki Yamamoto Goro Motomura Kazuhiko Sonoda Yukihide Iwamoto
Publish Date: 2016/01/14
Volume: 45, Issue: 5, Pages: 713-716
Abstract
We histopathologically examined a surgically resected full specimen obtained from an earlystage spontaneous osteonecrosis of the knee SPONK On a midcoronal cut section of the resected medial femoral condyle a linear fracture line paralleling the subchondral bone endplate was found Histopathologically prominent callus formation was seen comprising of reactive woven bone and granulation tissue on both sides of the fracture Fracturerelated bone debris was focally observed at the osteochondral side of the fracture Definitive features of antecedent bone infarction such as creeping substitution and bone marrow necrosis were not detected These findings suggested that SPONK was the result of a subchondral fracture rather than primary osteonecrosis
Keywords: