- M.B.B.S.
- M.S. Orthopaedics
- Fellow in Knee and Hip Replacement, Mumbai
- Fellow In Knee and Hip Surgery, Germany
- Fellow in Knee and Hip Surgery, NHS, Singapore
- Fellowship in Complex and revesion knee and Hip replacement, London, Lancaster, UK
When patients with knee arthritis come for consultation, one of the first questions is whether they need a “full” knee replacement or whether a “smaller” surgery can be done. The honest answer: it depends on exactly which part of the knee is damaged.
The knee has three separate joint compartments medial (inner side), lateral (outer side), and patellofemoral (kneecap-thigh bone interface). Arthritis can affect one, two, or all three compartments.
- Total Knee Replacement (TKR): replaces all three compartments.
- Partial Knee Replacement (PKR), also called unicondylar knee replacement (UKR), replaces only the damaged compartment.
Choosing the correct procedure impacts recovery time, function, longevity, and cost.
When Total Knee Replacement Is the Right Choice?
Total knee replacement is recommended when:
- Two or three compartments of the knee are affected
- Cruciate ligaments are damaged or deficient
- Significant deformity is present (bow-leg or knock-knee beyond 15 degrees)
- Inflammatory arthritis (rheumatoid, psoriatic) is the underlying disease
- Previous knee surgery has altered the anatomy
- The patient is significantly overweight or expected to put high stress on the joint
TKR is the more common operation worldwide since most patients have multi-compartmental arthritis by the time they require surgery.
Not sure which procedure is right for you? Send Dr. Utsav your knee X-rays on WhatsApp for an assessment of whether you might be a partial knee replacement candidate.
Comparison: TKR vs PKR Side by Side
| Aspect | Total Knee Replacement | Partial Knee Replacement |
|---|---|---|
|
Surgery duration |
60-90 minutes |
45-60 minutes |
|
Incision length |
8-10 inches typically |
3-5 inches |
|
Hospital stay |
4-5 days |
2-3 days |
|
Time to walk independently |
4-6 weeks |
2-3 weeks |
|
Time to return to
office work |
6-8 weeks |
3-4 weeks |
|
Time to drive |
6 weeks |
3-4 weeks |
|
Blood loss |
Moderate (sometimes
transfusion needed) |
Low |
|
Post-op pain |
Moderate, multimodal
management |
Less intense |
|
Range of motion
regained |
110-130 degrees typically |
110-130 degrees typically |
|
Knee feels “natural” |
Slight difference in feel –
implant is more “mechanical” |
Closer to native knee feel – cruciate ligaments preserved |
|
Implant survival at 15 years |
92-95% |
88-92% |
|
Cost (Nagpur, cash) |
₹1,80,000-₹2,80,000 |
₹1,60,000-₹2,40,000 |
Why Patients Often Prefer PKR - When It's Appropriate?
Patients who undergo well-indicated partial knee replacement consistently report that their operated knee feels more “natural” than a TKR knee.
The reason is anatomical: in PKR, the cruciate ligaments, which provide the knee’s “proprioception” or sense of position in space, and the other compartments are preserved. The knee retains more of its original biomechanics.
Recovery is also typically faster and easier. Many PKR patients return to walking, light work, and driving within 3-4 weeks — significantly faster than typical TKR recovery.
Why Some Surgeons Avoid PKR?
-Partial knee replacement has a slightly higher long-term failure rate than total knee replacement in some series — primarily because the unreplaced compartments can develop arthritis later, requiring conversion to TKR. The conversion is a more complex surgery than primary TKR.
Patient selection is therefore everything.
A poorly-selected PKR patient, with subtle multi-compartmental arthritis missed at screening, can fail within 5-10 years. A correctly-selected PKR patient has implant survival nearly comparable to TKR.
This is why PKR is best performed by surgeons with high-volume joint replacement experience and strict selection criteria — not as a “quick easy alternative” by general orthopaedic surgeons.
Robotic Assistance: Particularly Useful for PKR?
-One area where robotic-assisted surgery genuinely helps is partial knee replacement.
The small implants of PKR require precise positioning – even 2-3 degree errors can affect long-term outcomes. Robotic systems improve positioning accuracy in PKR more meaningfully than in TKR.
If PKR is being considered, asking whether the surgeon uses robotic, navigation, or computer-assisted techniques is a reasonable question.-
What This Means in Practical Terms?
If you’ve been told you “need” a total knee replacement, it’s worth a second consultation with a high-volume joint replacement surgeon to confirm whether PKR is an option.
Roughly 1 in 5 patients told they need TKR are actually PKR candidates — and the difference in recovery experience is significant.
If TKR is genuinely the right operation, that’s important to know too. Choosing PKR when arthritis affects multiple compartments only delays inevitable revision and adds avoidable complexity.
FAQ
Yes. If the unreplaced compartments develop arthritis years later, conversion to TKR is possible. It is a more complex surgery than primary TKR but is a well-established option.
At 15 years, implant survival is approximately 88-92% for well-selected PKR versus 92-95% for TKR. The difference is smaller than commonly believed if patient selection is rigorous.
Slightly. PKR typically costs 10-20% less than TKR because the implant is smaller and hospital stay is shorter. The difference is not dramatic.
Yes, if both knees meet the criteria for PKR and the patient is medically fit. Bilateral PKR has a faster combined recovery than bilateral TKR.
PKR requires very specific patient selection and surgeon experience. Many general orthopaedic surgeons don’t perform enough joint replacements annually to maintain PKR proficiency, so they default to TKR for all cases.
Have your own questions about knee replacement?
Dr. Utsav personally reviews patient queries. Whether you’re considering surgery in 6 months or 6 years, get clear, honest answers based on your specific situation. WhatsApp: Start conversation | Call: +91 7447799000