Article

Knee and hip pain are all too familiar to many Hong Kong people—from initially feeling soreness after walking a few extra steps, to later needing to hold onto walls when going up and down stairs, and finally even being woken up by pain at night.

Many people endure this for a year, two years, or even longer. While fears of surgery and concerns about post-operative recovery are completely understandable, joint degeneration will not naturally improve by "enduring" it; with every day of delay, the situation only becomes more complex.

The good news is that orthopaedic surgical technology has undergone a fundamental change in the past decade. The introduction of robotic-arm joint replacement surgery has raised the precision and safety of surgery to a new level—resulting in less post-operative pain, faster rehabilitation, and longer-lasting implants.

1. Which Stage of Joint Degeneration Are You In?

Degenerative arthritis forms slowly rather than breaking down suddenly. Understanding which of the four clinical stages you are in is vital for deciding the direction of treatment.

Stage 3: The Stage Where Most People Hesitate
Patients in Stage 3 find it hardest to make a decision. The pain certainly exists, but they seem still able to walk, so they choose to continue observing. The problem is that Stage 3 cartilage can no longer repair itself—conservative treatment can only relieve symptoms but cannot reverse the process of degeneration. The longer the decision is delayed, the more muscle loss occurs, and the post-operative rehabilitation path will only become more difficult. Conducting a comprehensive evaluation with an orthopaedic surgeon at this stage to understand early on whether robotic-arm assisted surgery is suitable can often achieve more ideal post-operative results.

Changing Walking Posture Because of Pain? The Cost is Higher Than You Think
When the knee hurts, many people unconsciously adjust their gait and shift their centre of gravity to the better side. Although this provides short-term relief, it creates another problem in the long run—the lumbar spine, the other knee, and the hip joints all bear additional loads. What was originally only a problem with one joint may eventually lead to the deterioration of several together. Addressing the problem early through robotic-arm assisted surgery is the most direct way to block this chain of deterioration.

2. What is a Prosthesis? How the Robotic Arm Makes It Last Longer

A prosthesis is an artificial joint, a medical implant used to replace a natural joint that has degenerated or been damaged. It is made of medical-grade materials such as titanium alloy, cobalt-chromium alloy, ceramics, or high-molecular-weight polyethylene to simulate the structure and function of human joints. However, whether a prosthesis can function for a long time depends even more on the degree of precision during implantation.

Implantation Angle is the Real Key to Prosthesis Longevity
After the prosthesis is placed, whether the angle is precise and the force is even are the core factors determining how long it can be used. Even with the most wear-resistant ceramic prostheses, if the implantation angle is slightly deviated, uneven force will accelerate wear. Robotic-arm assisted surgery ensures that every angle is executed precisely according to plan through pre-operative 3D planning and real-time intra-operative data. This precision allows for reduced tissue dissection, which minimizes surgical trauma and post-operative pain, while ensuring the advantages of the materials are fully reflected.

Biological Prostheses: Why the Robotic Arm is the Key to Their Success
The bottom of a biological prosthesis has a special porous coating that allows the body's own bone cells to gradually grow in and permanently fuse with the prosthesis. This is more stable than bone cement fixation and eliminates the hidden danger of bone cement ageing in the future. However, this process has a strict prerequisite: the bone-cutting surface must be sufficiently flat and smooth for bone cells to grow in close contact evenly. This is exactly the core advantage of robotic-arm assisted surgery—it can control the bone-cutting error within a sub-millimeter range, significantly increasing the success rate of biological prosthesis integration and allowing more patients to be eligible for this longer-lasting fixation method.

3. Debunking Common Myths

There are many misconceptions regarding joint replacement and robotics. Here is the clinical reality:

“Waiting a Little Longer to See if It Will Naturally Improve”—This Idea Needs Scrutiny Most
The sentence orthopaedic surgeons probably hear most during consultations is this one. This feeling is completely understandable, but one point must be faced squarely: once the cartilage of degenerative arthritis is worn, it will not regenerate. The result of continuing to wait is not “natural improvement”, but rather continued degeneration, continued muscle atrophy, and increased difficulty for future surgery. Conversely, receiving robotic-arm assisted surgery while physical condition is still good leads to faster recovery and the most ideal results.

4. In Special Circumstances, Robotic-Arm Assisted Surgery Can Better Show Its Strengths

While robotic assistance offers advantages for most, it is particularly transformative for these four groups:

• Active Individuals: For those wishing to return to hiking or golf, the robotic arm achieves superior ligament balancing, resulting in a joint that feels more "natural".
• Younger Patients (Under 65): These patients need their implants to last longer. Robotics allows for the preservation of more healthy bone and creates the ideal conditions for "biological fixation".
• Patients with Existing Metalwork (e.g., screws or nails from prior fractures): Patients with previous bone nails or plates from old fractures cannot use traditional surgical tools that go inside the bone canal. Robotic systems use external optical tracking, allowing for precision without needing to remove existing hardware.
• Severe Deformities (O-leg or X-leg): Correcting severe bow-leggedness or knock-knees is complex. The robotic system provides real-time feedback on ligament tension, allowing the doctor to make micro-adjustments for a perfect gait.