Do I Need a Total or Partial Knee Replacement Surgery?
Dr Alan Cheung
Senior Consultant Orthopaedic Surgeon in Singapore
MBBS (London), MRCS (England), FRCS (Trauma and Orthopaedics, England), Diploma in Sport and Exercise Medicine (UK), Fellow of the European Board of Orthopaedics and Traumatology, American Academy of Orthopaedic Surgeons (AAOS)
Knee pain can greatly affect one’s mobility and day-to-day life. For those with severe joint damage, knee replacement surgery may be recommended. The two main options are total knee replacement (TKR) and partial knee replacement (PKR). Here, we describe the two and explain which might be more suitable for your circumstances.
When is Knee Replacement Needed?
The knee is a complex joint where the thighbone, shinbone and kneecap meet. Smooth cartilage covers the ends of the bones, which allows for pain-free movement. However, over time, or after injury, this cartilage can wear away. When that happens, bones rub directly against each other, leading to pain, swelling, stiffness and loss of mobility.
Osteoarthritis is the most common reason for knee replacement surgery. Other causes include rheumatoid arthritis, post-traumatic arthritis after an injury, or deformities that lead to uneven wear of the joint.
While conservative measures like medications, injections and physiotherapy can relieve symptoms for a time, severe cases usually require surgery for long-term and substantial relief.
What Is Total Knee Replacement?
In a total knee replacement, the surgeon replaces all three compartments of the knee—the inner (medial), outer (lateral) and front (patellofemoral) compartments. The damaged bone and cartilage are removed and replaced with artificial implants made of metal and medical-grade plastic.
This operation is recommended when arthritis or damage is widespread across the entire knee. Because all compartments are resurfaced, patients often experience dramatic pain relief and improved function.
Recovery from total knee replacement involves a hospital stay followed by a rehabilitation programme. Physiotherapy helps patients regain mobility and build strength in the surrounding muscles and most people return to normal activities within a few months.
What Is Partial Knee Replacement?
Partial knee replacement, sometimes called unicompartmental knee replacement, is a less extensive surgery. Instead of resurfacing the entire knee, only the damaged compartment is replaced. The healthy cartilage, bone, and ligaments in the rest of the knee are preserved.
This procedure is suitable when arthritis or damage is limited to just one part of the knee, usually the medial (inner) compartment. Because the surgery is smaller in scale, it is often performed through smaller incisions and may result in faster recovery and more natural joint movement.
Patients who undergo partial knee replacement often report that the knee feels “more like their own” compared to total replacement, since much of the natural joint remains intact.
Comparing Total vs Partial Knee Replacement
Although both surgeries are designed to reduce pain and restore function to the knee, there are some notable differences between them:
Extent of Surgery
Total replacement addresses all three compartments, making it more suitable for widespread damage.
Partial replacement is reserved for patients with isolated disease.
Recovery
Partial knee replacement generally involves less blood loss, smaller scars, shorter hospital stays, and a quicker return to daily activities.
Total replacement requires more rehabilitation, but it provides long-term relief in cases of severe arthritis.
Longevity
Because more of the knee is preserved in a partial replacement, there is a chance that arthritis may eventually develop in the remaining compartments, leading to the need for revision surgery later on.
Total replacements tend to provide more predictable long-term outcomes in advanced cases.
Functionality
Partial replacements often feel more natural because key ligaments are preserved. This allows the knee to move more like it did before arthritis set in.
Total replacements, while highly effective, may not replicate the natural feel of the joint as closely.
Who Is a Candidate for Total Knee Replacement?
Total knee replacement is usually recommended for patients with:
- Severe arthritis affecting multiple compartments of the knee
- Pain that persists despite non-surgical treatments
- Significant stiffness and limited range of motion
- Deformities such as bowed legs or knock knees
It is particularly suitable for older patients or those with extensive joint damage who are looking for long-lasting relief.
Who Is a Candidate for Partial Knee Replacement?
Partial knee replacement may be considered for patients who:
- Have arthritis limited to a single compartment
- Maintain good range of motion in the knee
- Have stable ligaments, particularly the ACL
- Do not have severe deformity or widespread damage
It is often recommended for younger, more active patients who wish to preserve as much of their natural joints as possible.
If you are considering knee replacement, consult an orthopaedic specialist who can evaluate your condition and guide you toward the most suitable option. With today’s surgical expertise and technology in Singapore, patients can look forward to safe, effective treatment and a return to active living.
