What should you know about left unicompartmental knee replacement?

The knee has compartments that can wear unevenly. When damage is mainly confined to one compartment and the rest of the knee is suitable, a partial replacement may be considered. The operation uses a metal component and a plastic bearing to recreate the affected surfaces; common material terms include [Cobalt-Chrome Alloy](/materials/cobalt-chrome-alloy/) and [Highly Cross-Linked Polyethylene](/materials/highly-cross-linked-polyethylene/). Suitability depends on examination, imaging, ligament function, alignment, symptoms, and activity goals.

Before surgery, discuss medicines, dental concerns, home support, and exercises that can improve strength and mobility. Afterward, follow the wound and walking instructions, perform prescribed exercises, and increase activity in stages. A physiotherapy plan helps restore knee movement, thigh strength, balance, and confidence. Your surgeon may compare [Partial Knee Replacement](/treatments/joint-replacement/partial-knee-replacement/) with [Total Knee Replacement](/treatments/joint-replacement/total-knee-replacement/) when more than one compartment is affected.

Contact the surgical team promptly for increasing wound redness, drainage, fever, worsening pain, or a sudden loss of movement. Urgent help is needed for new chest pain, severe breathlessness, or a swollen painful calf. A fall, sudden inability to bear weight, or a new change in leg position also needs prompt assessment.

Which knee compartment is damaged, and are my ligaments and other compartments suitable for a partial replacement? What activity and walking milestones should I expect? Why would a total replacement be more appropriate in my case?