Biological resurfacing is a recent surgical technique used to treat problems of

Correct answer: (a) Knee joints

Explanation

Biological resurfacing replaces or covers damaged cartilage with biological tissue to restore a smooth bearing surface in a joint.

It is used to treat cartilage defects of the knee joint, especially in younger patients, to delay full joint replacement.

Unlike a metal arthroplasty, it promotes regrowth of cartilage-like tissue on the joint surface.