<unk>  is usually caused by prolonged sitting on a hard surface. It may also be related to<unk>  apophysitis, which may be caused by exercise, particularly in young and athletic patients.
Ischial bursitis
Infrapatellar bursitis
Prepatellar bursitis
Retrocalcaneal bursitis
Pes anserine bursitis
Olecranon bursitis
Facet joint arthrosis
Calcific bursitis