A knee replacement is a surgical procedure that can significantly improve the quality of life for individuals suffering from severe knee pain and dysfunction. However, determining the right time for this surgery is crucial for optimal outcomes.

When is a knee replacement indicated?

The most common reason for considering a knee replacement is osteoarthritis, a degenerative joint disease that causes cartilage breakdown, leading to pain, stiffness, and reduced mobility. Patients typically experience persistent pain despite conservative treatments such as physical therapy, medications, or corticosteroid injections.

If knee pain interferes with daily activities like walking, climbing stairs, or participating in recreational activities, it may be time to consult an orthopaedic surgeon. Another indicator for a knee replacement is the degree of joint damage visible on imaging studies. X-rays can reveal significant cartilage loss and bone spurs, which often correlate with the severity of symptoms.

Additionally, if patients find themselves relying heavily on assistive devices like canes or walkers to move around comfortably, this may signal that their condition has progressed to a point where surgery could be beneficial. Timing is also essential; waiting too long can lead to muscle atrophy and decreased overall fitness, making recovery more challenging post-surgery.

Conversely, undergoing surgery too early may not yield the desired results if less invasive treatments could still provide relief. Ultimately, the decision should involve thorough discussions between the patient and their healthcare provider. Factors such as age, activity level, overall health status, and personal preferences play significant roles in determining the right timing for a total knee replacement. By carefully weighing these considerations, patients can make informed decisions that align with their lifestyle and health goals.

What is the success rate of knee replacement surgery?

Total joint arthroplasty has been shown to significantly improve function and a patient's quality of life in the long term. Studies show that 85 per cent of patients consider their outcome as good or excellent, and the risk of complications is relatively low. Outcomes have been shown to be better in hospitals or with surgeons who perform a high volume of joint replacements.

What are the different types of knee replacement?

Most knee replacements in the UK are bicondylar, which resurfaces the femoral joint surface with a metal cap, the tibial joint surface with a metal and UHMWPE liner and some surgeons resurface the patella with a UHMWPE button. Established knee replacement designs have 95% 10-year and 85% 20-year implant survival results.

Unicompartmental or 'half' knee replacements are used if there is significant arthritis in the lateral or medial compartment, a functional anterior cruciate ligament, minimal deformity and in young patients. They replace the tibial surface and the posterior condyle of the femur on the affected side.