A Case of Spontaneous Osteonecrosis of the Knee with Early and Simultaneous Involvement of the Medial Femoral Condyle and Medial Tibial Plateau

Abstract EN

Spontaneous osteonecrosis of the knee (SPONK) usually involves a single condyle, most often the medial femoral condyle (MFC).

Involvement of the medial tibial plateau (MTP) is less common, occurring in about 2% of knees with SPONK.

Early onset SPONK on the ipsilateral side of the medial compartment is very rare, with, to our knowledge, only four cases reported to date.

We describe a very rare case of SPONK with early simultaneous development in the MFC and MTP.

Serial plain radiographs and magnetic resonance imaging showed that SPONK in both condyles followed a similar progressive course.

The pathological findings in these lesions were similar to those observed in subchondral insufficiency fractures.