Knee Revision Surgery
Expert Care for Failed Knee Implants
Total knee replacements give excellent long-term results. Sometimes an implant loosens, wears out, or develops problems. Knee revision surgery replaces the failed implant and restores pain-free function. Knee revision is more complex than the first knee replacement. Dr. Nabeel Moosa has extensive experience with these demanding cases.
Why Knee Revision Surgery Is Needed
Loosening
Loosening is the most common reason for revision. The implant separates from the bone over time. This causes pain with activity. Loosening worsens gradually over years.
Wear and Bone Loss
The plastic surfaces of an implant wear over time. Wear particles can trigger bone loss around the implant. When bone loss threatens the implant, revision becomes necessary.
Infection
An infected knee implant is a serious problem. Treatment often needs two operations. First we remove the implant and treat the infection. Later we insert a new implant.
Stiffness
Excess scar tissue sometimes makes a knee stiff. Severe stiffness that does not respond to other treatment may need revision surgery.
Instability
A knee that feels wobbly or gives way may need revision. New implants and careful balancing restore stability.
Fracture Around the Implant
A fracture near the implant may compromise its fixation. Revision may be needed to restore stability.
Why Knee Revision Is More Complex
Bone Loss
Wear and loosening destroy bone around the implant. Removing old cement takes more bone. We often need metal wedges or bone grafts to rebuild support.
Soft Tissue Damage
Scar tissue from the first surgery makes the operation harder. Ligaments may be damaged or stretched. Balancing the new knee takes skill and time.
Technical Demands
We choose from a wider range of specialised implants. The operation takes 1.5 to 3 hours instead of 1 to 2.
Slower Healing
Recovery takes longer than a first replacement. Weight-bearing may be limited for longer.
How We Evaluate Your Failed Knee
Your History
- When did you have your first knee replacement?
- When did the problems start?
- What is the main problem: pain, stiffness, or instability?
- How does it affect your daily life?
Physical Examination
- Movement and stability of your knee
- Pain with specific movements
- Comparison with your other knee
- Your walking pattern
Imaging
- Standing X-rays show the implant position and any loosening
- CT scan if we need more detail on bone loss and alignment
- Comparison with older X-rays
Blood Tests
- Infection markers if we suspect infection
- Standard tests before surgery
Planning Your Surgery
Dr. Moosa decides:
- Whether we replace the whole implant or only one part
- Which revision implants suit your knee
- Whether you need bone grafts or metal wedges
- The timing of your operation
The Knee Revision Procedure
The Steps of the Operation
Step 1 — Incision
We usually follow your old scar. We may extend it for better access.
Step 2 — Exposure
We work carefully through scar tissue to open the knee.
Step 3 — Removal
We remove the old femoral and tibial components. We remove the kneecap button if present. We remove cement carefully to protect your bone.
Step 4 — Bone assessment
We measure bone loss in each area of the knee.
Step 5 — Rebuilding
We fill areas of bone loss with bone graft or fit metal wedges to the new implant.
Step 6 — New components
We fit revision implants. These often have longer stems for extra stability.
Step 7 — Balancing
We balance the soft tissues so the knee moves smoothly and feels stable.
Step 8 — Testing
We bend and straighten the knee. We check alignment, stability, and balance.
Step 9 — Closure
We close all the tissue layers carefully.
Operation time: 1.5 to 3 hours.
Recovery from Knee Revision
Recovery takes longer than a first knee replacement.
Hospital Stay
You stay 2 to 3 days. Physiotherapy starts immediately. We manage your pain closely.
Early Recovery (Weeks 1 to 8)
- Pain may be greater than after your first surgery
- Use a walker or crutches as instructed
- Weight-bearing may be limited for 2 to 4 weeks
- Do gentle bending and straightening exercises daily
- Attend physiotherapy 2 to 3 times per week
- No driving until you are safe and pain is controlled
Progressive Recovery (Weeks 8 to 16)
- You stop using crutches as your strength returns
- Walking distances increase
- Desk workers return to work at 8 to 12 weeks
- Standing jobs take 12 weeks or more
- You start cycling and swimming with approval
Long-Term Recovery (3 to 12 Months)
By 6 months, most patients have:
- Minimal pain
- Good movement
- A return to many activities
What to Expect from Knee Revision
Realistic Outcomes
Knee revision restores good function and pain relief for most patients. Results may not match a first knee replacement because the surgery is harder.
- Pain relief: Most patients achieve significant relief
- Function: Most patients return to reasonable activity
- Lifespan: Revision implants usually last 10 to 15+ years
What Affects Your Result
- The reason your first implant failed (loosening usually does better than infection)
- The quality of your remaining bone
- Your commitment to physiotherapy
- Your general health
Frequently Asked Questions
Why did my first knee replacement fail?
Several factors can contribute. Dr. Moosa explains the specific cause in your case and how we protect the new implant.
How long will the revised knee last?
Usually 10 to 15+ years. Lifespan varies with your bone quality and activity.
Will I need another revision in the future?
Possibly, but many patients never do. Modern implants and techniques have improved durability.
Is recovery harder than the first surgery?
Often yes, especially if you need bone grafts. Recovery typically takes 25 to 50 percent longer.
Can I return to my activities?
Most activities become possible again. The timeline is longer than after a first replacement.
Do you accept medical aid?
Yes. Dr. Moosa accepts most major schemes and helps with authorisation and billing.
Need Knee Revision Surgery?
If your knee implant is failing, book a consultation with Dr. Nabeel Moosa. He will assess your knee thoroughly and explain your options.