Which option is best? Total vs partial knee replacement

Knee replacement surgery is a common and effective treatment for advanced osteoarthritis and other degenerative knee conditions. Surgery may be recommended when conservative treatments no longer provide relief. There are two main types of knee replacement procedures: total knee replacement (TKR) and partial knee replacement (PKR). Choosing the right one depends on the extent of the damage in your knee and your individual circumstances.

What’s the difference between total and partial knee replacement?

A total knee replacement involves replacing all three compartments of the knee: the inside (medial), outside (lateral), and front (patellofemoral). The surgeon removes the damaged cartilage and bone from the ends of the thigh bone (femur) and shin bone (tibia), then fits a metal and plastic prosthesis to resurface the joint.

In contrast, a partial knee replacement replaces only the damaged portion of the knee—usually one compartment—while preserving the healthy bone, cartilage, and ligaments in the rest of the joint. This is often suitable for patients with localised damage, most commonly in the medial compartment.

Who is a good candidate for partial knee replacement?

Partial knee replacement is generally considered for patients who:

Have arthritis limited to one part of the knee
Have a stable knee with intact ligaments
Are not significantly overweight
Are relatively active and healthy
Do not have significant knee stiffness or deformity

Because the procedure is less invasive than total knee replacement, recovery may be quicker and function may feel more natural. However, not all patients are eligible.

What are the advantages and disadvantages?

Partial knee replacement

Advantages

Smaller incision and quicker recovery
Less pain and blood loss
More natural knee movement
Lower risk of complications such as infection and blood clots

Disadvantages

Not suitable for widespread arthritis
Slightly higher risk of needing revision surgery in future
Less predictable long-term durability in some patients

Total knee replacement

Advantages

Suitable for widespread or severe arthritis
Long-term results are well studied with good success rates
Addresses all affected parts of the joint

Disadvantages

Longer recovery period
May result in less natural-feeling movement
Higher risk of post-operative stiffness

How is the right option decided?

The decision is made based on clinical examination, imaging (usually X-rays or MRI), and your symptoms. An orthopaedic surgeon will assess the pattern and extent of arthritis, joint stability, and overall health to determine the most appropriate procedure.

What if arthritis worsens after a partial replacement?

If arthritis develops in another part of the knee after a partial replacement, revision to a total knee replacement is possible. While revision procedures are generally more complex, a well-performed partial knee replacement that later requires revision is still considered a valid treatment pathway.

Could a less invasive approach work for you?

If you have isolated damage in one part of your knee and meet the criteria, a partial knee replacement may offer quicker recovery and more natural knee function. However, if arthritis is more advanced or widespread, a total knee replacement is usually the more appropriate option. A thorough assessment by a specialist is the best way to decide which approach is right for you.