Arthroscopy is the most common surgical alternative to knee replacement. It

Knee replacement, also called knee arthroplasty or total knee replacement, is a surgical procedure to resurface a knee damaged by arthritis.

Metal and plastic parts are used to cap the ends of the bones that form the knee joint, along with the kneecap.

In other words, Total knee replacement surgery or knee arthroplasty is a surgical procedure where parts of knee joints are replaced with artificial parts.

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Patelloplasty is resurfacing or revision of the patella in knee replacement surgery. Arthroscopy is a surgical procedure orthopaedic surgeons use to visualize, diagnose, and treat problems inside a joint.

"Bilateral" means both the knees are concerned.

"replacement" probably means a prothesis will be put instead of the bone and flesh knee.

To elaborate on above answer bilateral knee replacement is a surgical procedure where in knee replacement surgeon replaces both arthritic knees of patients in a same hospitalization period.

L-TKR stands for "Lateral Total Knee Replacement," a surgical procedure where the damaged knee joint is replaced with artificial components to improve function and reduce pain.