Should You Get a Partial Knee Replacement? An Orthopaedic Surgeon’s Guide

Partial knee replacement, also known as unicompartmental knee replacement, is a surgical procedure that replaces only the damaged part of the knee joint, typically due to arthritis, while preserving the surrounding healthy bone, cartilage, and ligaments. It is performed through a small incision and uses specialised implants tailored to one compartment of the knee, allowing for less tissue disruption, faster recovery, and a more natural joint feel. 

This guide explains how the procedure works, who it’s for, and what to expect during the decision-making process, surgery, and recovery.

When Should You Consider Surgery?

Surgery is typically considered after non-surgical treatments such as physiotherapy, medications, or joint injections fail to provide lasting relief. 

You may want to discuss surgery with an orthopaedic surgeon if you experience:

Failed conservative management: If physiotherapy, medications, or joint injections no longer relieve pain or restore mobility.

Daily limitations: Difficulty with walking, stairs, or sleep that significantly affects quality of life.

Medical fitness: Patients should be fit for anaesthesia and able to participate in postoperative rehabilitation.

Partial vs Total Knee Replacement: Which Is Right for You?

When deciding between partial and total knee replacement, several differences are important to consider:

Surgical scope: Partial replacement addresses only one compartment; total replacement replaces all three.

Tissue preservation: Partial surgery retains more of your natural anatomy, including ligaments and unaffected cartilage.

Recovery experience: Patients undergoing partial replacement often have a shorter hospital stay (1–2 nights) and faster functional recovery.

Future flexibility: If arthritis later spreads, a partial knee replacement can be revised to a total knee replacement.

The choice of procedure is guided by the pattern of arthritis, joint stability, and patient-specific goals.

Who May Benefit from Partial Knee Replacement

Orthopaedic surgeons consider several clinical factors to determine if you’re eligible for partial knee replacement.

Key considerations include:

Localised arthritis damage: Arthritis confined to the inner, outer, or front compartment of the knee.

Functioning cruciate ligaments: These stabilising structures must be intact and working properly.

Adequate knee movement: Ability to bend the knee to at least 90 degrees before surgery.

Stable knee joint: No significant ligament damage or instability during examination.

Your activity level, medical history, and recovery expectations will also guide your treatment recommendation.

Recovery, Risks, and Long-Term Outlook with Partial Knee Replacement

Recovery after partial knee replacement is typically smooth and faster than with total knee replacement. Most patients begin walking with assistance on the day of surgery and continue progressing through a structured physiotherapy plan. Within 3 to 6 months, many return to daily routines and low-impact activities with improved comfort and mobility.

Like all surgical procedures, partial knee replacement carries some risks. However, these are relatively low due to the procedure’s minimally invasive nature and targeted approach. 

Your orthopaedic surgeon will review these considerations with you, including rare complications such as infection, blood clots, implant wear over time, or future arthritis in other knee compartments. With appropriate planning and follow-up, most patients enjoy long-term improvement in knee function and quality of life.

Conclusion

Partial knee replacement may be a suitable option for patients with arthritis limited to one compartment of the knee. By preserving healthy tissue and supporting faster recovery, it offers a less invasive alternative to total knee replacement. If conservative treatments are no longer effective and daily activities are affected, consult an orthopaedic specialist in Singapore to evaluate whether this procedure aligns with your clinical needs and goals.