Shawn Stachler, DO

Knee Replacement

Partial Knee Replacement (also called unicompartmental knee arthroplasty)

Resurfacing only the damaged compartment of the knee, leaving the healthy parts alone.

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What it is

A partial (unicompartmental) knee replacement resurfaces only the one part of the knee that is worn out — most often the inner (medial) compartment — and leaves the healthy cartilage and the knee's own ligaments in place. It is an option when arthritis is limited to a single compartment and the knee is otherwise stable and well aligned. Compared with a total knee replacement it removes less bone and often recovers faster, but it is not right for everyone, and a partial replacement can later need conversion to a total.

Common symptoms

  • Pain localized to one side of the knee, most often the inner side
  • Pain with walking and stairs, with relatively preserved motion
  • X-rays showing arthritis confined to one compartment
  • Symptoms not controlled by therapy, medication, or injections

Non-surgical options

  • Weight management and low-impact exercise
  • Physical therapy and an unloader brace
  • Anti-inflammatory medication when appropriate
  • Corticosteroid or hyaluronic acid injections

The procedure

Performed under spinal or general anesthesia, often with a nerve block, through a smaller incision than a total knee replacement. Only the damaged compartment is resurfaced with metal and plastic components; the rest of the knee is left alone. Most patients go home the same day.

Recovery timeline

  • First 1–2 weeksWalking with a cane or crutches, bearing weight as allowed. Home exercises and swelling control. Many patients need little formal therapy.
  • Weeks 2–6Walking unaided as comfort allows. Return to most daily activities; driving once off opioid medication and in control of the leg.
  • Weeks 6–12Return to low-impact recreation. The knee often feels more natural than after a total replacement because the ligaments are preserved.
  • Months 3–12Continued strengthening. Durable pain relief is expected in appropriately selected patients.
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The information on this page is provided for general educational purposes only and does not constitute medical advice, diagnosis, or treatment. Individual cases vary. Always consult a qualified clinician about your condition. In an emergency call 911.