Hip joint

The ball-shaped structure at the upper end of the thigh bone fits into a deep, secure socket in the pelvis. However, this joint may be stressed by movements such as mounting a bicycle, or a horse, or in a fall, or from sitting cross-legged when unaccustomed to this position.

As tension becomes locked into the hip joint, there may be restricted mobility, a sharp jabbing pain deep in the joint or a milder ache when walking or dancing.