Which factor most influences early weight-bearing decisions after cemented arthroplasty?

• A. Age of patient
• B. Surgical approach
• C. Fixation stability
• D. Surgeon preference

Answer: (C)

The primary factor is fixation stability of the implanted component. After a cemented arthroplasty, the cement mantle bonds the prosthesis to bone, so early loading places stress across the cement–bone–implant interface. If fixation is solid—adequate cement mantle, proper seating, and no signs of micromotion—the construct can safely tolerate early weight bearing, which aids rehabilitation. If fixation is questionable or loose, loading can cause micromotion, subsidence, or cement fracture, risking loosening and failure, so weight bearing is delayed or progressed cautiously.

Age can influence bone quality and healing potential but does not dictate the mechanical safety of loading as directly as stable fixation does. The surgical approach and surgeon preference may affect technique or practice patterns, but they are not the decisive biomechanical factor governing when to allow weight bearing.