<unk> , also referred to as dancer's<unk> , is a medical condition characterized by a<unk>  sensation felt when the<unk>  is flexed and extended. This may be accompanied by a<unk>  or popping noise and pain or discomfort. Pain often decreases with rest and diminished activity.<unk>  is commonly classified by the location of the<unk>  as either extra- articular or intra-articular.
Snapping hip syndrome
Facet syndrome
Heel pad syndrome
Milwaukee shoulder syndrome
Patellar subluxation syndrome
Infrapatellar fat pad syndrome
Iliotibial band syndrome
Back strain