Partial Knee Replacement
Partial knee replacement, also known as unicompartmental knee replacement, is a surgical option used to treat arthritis that affects only one part of the knee joint.
Unlike a total knee replacement, a partial knee replacement preserves the healthy parts of the knee while replacing only the damaged compartment. For selected patients, this may provide an alternative to total knee replacement surgery.
Dr Alex Nicholls provides assessment and treatment for knee arthritis and knee degeneration, with treatment recommendations tailored to the individual patient’s symptoms, imaging findings, and functional goals.
What Is a Partial Knee Replacement?
The knee joint is divided into compartments:
Medial (inner side)
Lateral (outer side)
Patellofemoral (behind the kneecap)
In some patients, arthritis affects only one compartment rather than the entire joint.
A partial knee replacement involves replacing only the damaged area of the knee while preserving:
Healthy cartilage
Ligaments
Bone
Unaffected compartments of the joint
This differs from a total knee replacement, where the entire knee joint surface is replaced.
Who May Be Suitable for Partial Knee Replacement?
Partial knee replacement may be considered in patients with:
Arthritis limited to one compartment of the knee
Ongoing pain despite non-surgical treatment
Preserved knee stability
Reasonable knee movement
Not all patients with knee arthritis are suitable for partial knee replacement surgery.
Assessment typically involves:
Clinical examination
X-rays
Imaging studies
Review of symptoms and function
Treatment decisions are individualised based on the pattern and severity of arthritis.
Symptoms of Compartmental Knee Arthritis
Symptoms may include:
Pain on one side of the knee
Stiffness
Swelling
Difficulty walking or climbing stairs
Reduced activity tolerance
Symptoms often worsen gradually over time.
Non-Surgical Treatment Options
Before considering surgery, non-surgical treatment may include:
Physiotherapy
Strengthening programs
Anti-inflammatory medication
Injection therapy
Activity modification
Weight management strategies
Surgery is generally considered when symptoms continue to significantly affect daily activities and quality of life.
How Does Partial Knee Replacement Differ from Total Knee Replacement?
A partial knee replacement replaces only the damaged portion of the knee joint.
Potential differences compared with total knee replacement may include:
Smaller surgical exposure
Preservation of more natural knee structures
Retention of healthy bone and cartilage
Different recovery experience in selected patients
However, suitability depends entirely on the distribution of arthritis within the knee.
What Happens During Partial Knee Replacement Surgery?
During surgery:
The damaged compartment of the knee is removed
Prosthetic components are inserted into the affected area
Healthy areas of the knee are preserved where possible
The aim is to improve pain and function while maintaining stability and movement.
Recovery After Partial Knee Replacement
Recovery after partial knee replacement surgery varies between individuals.
Early Recovery
The initial focus is generally on:
Walking
Swelling management
Pain control
Restoring knee movement
Physiotherapy often begins soon after surgery.
Rehabilitation
Rehabilitation may involve:
Strengthening exercises
Walking progression
Range of motion exercises
Balance and movement training
Recovery progression depends on:
Overall health
Strength prior to surgery
Rehabilitation participation
Individual healing response
Returning to Daily Activities
Most patients gradually return to:
Walking
Day-to-day activities
Low-impact exercise
The timing varies depending on recovery progress and individual function.
Technology in Knee Replacement Surgery
Modern knee replacement surgery may involve technologies designed to assist with:
Surgical planning
Alignment assessment
Implant positioning
Intraoperative precision
Research continues to examine how technology may influence outcomes in knee arthroplasty surgery.
Dr Alex Nicholls has contributed to research examining technology usage and outcomes in knee replacement surgery.
Frequently Asked Questions
What is the difference between partial and total knee replacement?
A partial knee replacement treats arthritis affecting one part of the knee, while a total knee replacement replaces the entire knee joint surface.
How do I know if I am suitable for partial knee replacement?
Suitability depends on the location and severity of arthritis, knee stability, imaging findings, and overall function.
Is recovery quicker after partial knee replacement?
Recovery experiences vary between individuals and procedures. Rehabilitation and recovery progression depend on several factors.
Can a partial knee replacement be converted to a total knee replacement later?
In some cases, further surgery may be required over time depending on arthritis progression or implant-related factors.
Will I still need physiotherapy after surgery?
Physiotherapy is commonly recommended to assist with strength, mobility, and recovery following surgery.
Are there alternatives to surgery?
Yes. Non-surgical treatment options are often explored before surgery is considered.
Evidence-Based Knee Care
Dr Alex Nicholls maintains an active involvement in orthopaedic research and education relating to knee surgery, sports knee injuries, and knee arthroplasty.
Treatment recommendations are based on clinical assessment, imaging findings, symptoms, and the individual goals of each patient.