Which is a common indication for revision arthroplasty?

• A. Loosening of components
• B. Severe osteoarthritis
• C. Osteoporosis
• D. Primary knee pain

Answer: (A)

The key idea is that revision arthroplasty is performed to address problems with a previously implanted joint that undermine its fixation or function. Loosening of components is a common indication because when the bone-implant bond weakens, the prosthesis loses stability, causes pain, and often shows radiographic signs of loosening or osteolysis. Replacing the worn or loose components restores proper alignment and secure fixation, improving pain and function.

Severe osteoarthritis is typically the reason for a primary joint replacement rather than a revision; it may be present in the native joint, but once a prosthesis is in place, OA alone isn’t the usual trigger for revision. Osteoporosis affects bone quality and can complicate the revision procedure or fixation but isn’t itself an indication to revise. Primary knee pain without evidence of prosthetic failure also doesn’t justify revision.