Can You Have Two Partial Knee Replacements? Understanding Bilateral Options

If you have arthritis affecting both knees, you may be wondering whether each joint can be treated without a full knee replacement. For suitable patients, bilateral partial knee replacement, performed either together or in stages, is a proven option when arthritis is limited to one compartment in both knees.

This article explains when this approach may be recommended, what the procedure involves, and what to expect during recovery.

What Are Partial Knee Replacements?

A partial knee replacement in Singapore, or unicompartmental knee replacement, is a surgical procedure that replaces only the damaged part of the knee joint. The knee has three compartments: the inner (medial), outer (lateral), and front (patellofemoral). This procedure treats arthritis in a single compartment, leaving healthy bone and cartilage untouched.

During surgery, the worn cartilage and bone are removed and replaced with metal and plastic components. Compared to a total knee replacement in Singapore, partial knee replacement preserves more of the knee’s natural structure and movement.

Key advantages include: 

Smaller incision: Typically 3–4 inches vs. 6–8 inches for total replacement.

Faster recovery: Many return to normal activity within 6–8 weeks.

Preserved range of motion: Healthy structures support more natural movement.

Bone preservation: Maintains bone for potential future procedures.

Can You Have Two Partial Knee Replacements?

Bilateral partial knee replacement is possible for patients who have arthritis limited to the same compartment in both knees, most commonly the inner (medial) compartment. This procedure may be done simultaneously (both knees in one operation) or in stages (each knee treated several months apart), depending on your condition and recovery goals.

An orthopaedic surgeon will evaluate whether you’re a suitable candidate based on the following factors:

• Compartment location: Arthritis must be confined to the same compartment in both knees.

• Bone and cartilage health: Adequate structure must remain in the unaffected areas.

• Ligament stability: Crucial ligaments, such as the ACL, must be intact and functional.

• Age and activity level: Typically suited for active adults aged 50 to 75.

• Non-surgical response: Physiotherapy, injections, or medications have not provided sufficient relief.

• General health: You should be well enough to undergo surgery and actively participate in rehabilitation.

• Expectations: Understanding that each knee may respond differently to treatment.

Surgical Timing: Simultaneous vs. Staged Replacement

The timing of bilateral partial knee replacement depends on your symptoms, overall health, and recovery goals. Some patients undergo simultaneous surgery, where both knees are treated in a single operation with a unified recovery period. Others choose a staged approach, spacing the procedures a few months apart to allow one knee to heal before addressing the other.

• Simultaneous surgery: One operation and hospital stay, followed by 4 to 6 weeks of modified activity for both knees.

• Staged surgery: Procedures are spaced 3 to 6 months apart, allowing full recovery of the first knee before the second.

Recovery After Bilateral Partial Knee Replacement

Recovery varies depending on whether the surgery is performed on both knees at once or in separate stages. The level of support and pace of rehabilitation will differ based on your surgical plan.

Simultaneous Surgery

Patients who undergo simultaneous surgery often require more support in the early recovery phase, as both knees are healing at the same time.

• Mobility aids: Crutches or a walker are typically needed for 2–4 weeks.

• Home adjustments: Stair rails, shower chairs, and raised toilet seats can help improve safety and comfort.

• Physiotherapy: Daily structured rehab focusing on both knees.

• Return to work: Desk-based roles may resume in 3–4 weeks; physical jobs may require 6–8 weeks or more off.

Staged Surgery

Staged surgery allows time to recover from one procedure before undergoing the next, which may reduce the need for extensive assistance early on.

• Mobility aids: Used during each recovery phase but typically for shorter durations.

• Home adjustments: Similar recommendations apply but may be less critical when only one knee is healing.

• Physiotherapy: Focuses on one knee at a time, with a second round of rehab after the next procedure.

• Return to work: Desk work may resume within 2–3 weeks of each surgery; timelines will restart after the second procedure.

Conclusion

Bilateral partial knee replacement can be a highly effective treatment for patients with arthritis confined to the same compartment in both knees. Whether performed together or in stages, the procedure offers pain relief, faster recovery, and preservation of natural joint function, when performed on appropriately selected patients.

Schedule a consultation with our orthopaedic surgeon in Singapore to learn whether this treatment approach is right for you.