What movements are constrained following a total hip replacement?

THA: Hip precautions for posterior approach usually to limit hip flexion greater than 90 degrees, crossing legs past midline. Hip precautions for anterior approach usually less, but limit extremes of hyperextension and extremes of external rotation.

It depends...: Early movement restrictions are based on the surgical method used. Extreme positions need to be avoided in the first 6 weeks no matter what. If an anterior approach is used, hyperextension combined with rotating the foot outward can be a problem. If a posterior approach is used, the risky move is hip flexion (bringing hip up to chest) combined with internal rotation.

Few if any: Total hip replacement should restore motion in an arthritic hip, often to the range that was present before arthritis developed. Implant position can impair some movement and some hip positions may be discouraged by your surgeon (ie: the splits, excessive hip rotation, hyperflexion with internal rotation, or some yoga positions).