Knee Resurfacing vs Full Knee Replacement — How FT3D Changes the Decision

By Dr TS Gill  ·  Max Super Speciality Hospital, Mohali  ·  May 2026

This is a conversation I have several times a week. A patient comes in having been told they need a total knee replacement. They’ve done some reading, come across “resurfacing” or “partial replacement”, and they want to know if that’s an option. Sometimes it is. Sometimes it isn’t. And sometimes the question itself reveals a misunderstanding about what each procedure involves.

Let me walk through the actual clinical differences, who benefits from each, and why — in my practice — the introduction of RoboLens FT3D has changed some of these conversations.

The Basic Difference

A total knee replacement removes the entire articulating surface of the knee — the ends of the femur, the top of the tibia, and typically the back of the kneecap — and replaces all of it with metal and polyethylene components. It’s a comprehensive solution for widespread joint destruction.

Knee resurfacing (also called unicompartmental or partial knee replacement) replaces only the damaged compartment. The knee has three compartments: medial (inner), lateral (outer), and patellofemoral (the joint between the kneecap and the thigh bone). When arthritis is significant in one compartment but the others are largely preserved, resurfacing targets only that area. The healthy bone and cartilage — and crucially, the natural ligaments — stay in place.

Why Resurfacing Feels More Natural

This is the thing most patients want to know about. A properly performed partial knee replacement does feel more natural than a total replacement — and there’s a biological reason for it.

In a total knee replacement, the ACL and PCL — the cruciate ligaments that control the way the femur rolls and glides on the tibia — are removed. The implant design compensates for this with built-in stability features, but it changes the kinematics of the joint. Most patients adapt well, but there’s a subset who always feel that their replaced knee is a mechanism rather than a joint.

In resurfacing, the cruciate ligaments are preserved. The knee still moves the way a knee is supposed to move — guided by your own ligaments and soft tissues, not a plastic post inside the implant. Patients who undergo resurfacing consistently describe their knee as feeling closer to normal. Several of my resurfacing patients have told me they forget which knee was operated on, which is the best possible outcome.

Why Resurfacing Has Historically Had Higher Failure Rates

If resurfacing sounds better, why doesn’t everyone do it? The answer comes down to precision — and this is where FT3D becomes directly relevant.

Resurfacing is more technically demanding than total replacement. The implant is smaller, the tolerances are tighter, and the margin for malalignment is lower. Studies over the past two decades have shown that when resurfacing is done with conventional instruments — even by experienced surgeons — the revision rate is higher than total replacement at 10–15 years. The most common reason for early failure is implant malalignment causing uneven loading and accelerated wear.

This is what changed with robotic guidance — and specifically with real-time systems like FT3D. When implant position is guided to sub-millimetre accuracy during the procedure, the main driver of early resurfacing failure is largely eliminated. The survival curves for robotically assisted partial replacement are now approaching those of conventional total replacement, while preserving the functional advantages of resurfacing.

In other words: resurfacing used to carry a precision penalty that made it riskier. FT3D removes most of that penalty.

The Decision Framework

When a patient sits across from me with their X-rays, here is roughly how I think about the decision:

No single factor is determinative. I’ve done resurfacing on patients who ticked most of the “total replacement” boxes because their overall picture still favoured it. The X-ray, the examination, and the conversation about your goals all factor in.

What If I Need the Other Side Done Later?

A common worry: “If I have resurfacing now and arthritis develops in the other compartments, do I need another surgery?” The answer is yes, potentially — but it’s not as bad as it sounds.

Conversion from a well-performed partial replacement to a total replacement is a significantly less complex procedure than revision of a failed total replacement. The intact bone stock, preserved soft tissues, and well-placed original implant make conversion straightforward. In the meantime, you’ve had years of better function and natural knee movement that you wouldn’t have had with a total replacement from the start.

For a proper assessment of whether resurfacing is right for your specific knee, bring your standing X-rays to a consultation. That’s the only honest starting point. → Book at Max Hospital Mohali

Related: What is RoboLens FT3D resurfacing? · RoboLens FT3D full guide · Partial knee replacement in Chandigarh