Partial Knee Replacement

Not every knee condition requires a full replacement. You may be a suitable candidate for partial knee replacement if your pain is localized to one side of the knee, your knee ligaments, especially the ACL, are intact, there is minimal deformity such as bowing or a knock kneed alignment, conservative treatments have not worked, you have a good range of motion in the knee, and you lead an active lifestyle and want a faster recovery than a full replacement typically allows. A skilled partial knee replacement surgeon in Chennai will confirm suitability through a clinical evaluation, imaging, and a functional assessment before recommending this approach over a total replacement.

Partial knee replacement is most commonly performed for osteoarthritis, a degenerative joint disease that causes the cartilage in the knee to wear away, and it can also benefit patients with post traumatic arthritis or cartilage damage from a previous injury. Other conditions it can address include medial compartment arthritis, where arthritis affects the inner side of the knee joint, isolated cartilage defects that do not involve the entire joint, and chronic knee pain that stays localized to one section of the knee and does not improve with physical therapy or medication.

Understanding how the knee is built helps explain why a partial replacement works. The knee is a hinge joint formed by the femur, or thigh bone, the tibia, or shin bone, and the patella, or kneecap. These bones are covered with smooth cartilage that allows frictionless movement, with synovial fluid between them acting as a natural lubricant, while ligaments and surrounding muscles provide stability.

When cartilage in one compartment wears out due to osteoarthritis or injury, the bones in that area begin rubbing against each other, causing pain, swelling, and stiffness. Rather than replacing the entire joint, partial knee replacement targets only the damaged compartment, leaving the rest of the knee's natural structure and function intact.

Before undergoing partial knee replacement, patients go through a thorough evaluation, including a physical examination, a review of medical history, and imaging such as X rays or an MRI to assess the extent of joint damage. Preparation often includes physical therapy to strengthen the surrounding muscles ahead of surgery, blood tests to check for any underlying health issues, and a consultation about anaesthesia options, either general or regional. Patients are also told which medications to pause before surgery, such as blood thinners, to reduce the risk of bleeding during the operation.

Partial knee replacement is typically performed under general or spinal anaesthesia, and the surgery itself generally takes one to two hours. The surgeon makes a small incision over the damaged part of the knee, removes the damaged cartilage and bone from that compartment, and replaces it with a metal and plastic implant designed to mimic natural knee movement. Only the affected compartment, inner or outer depending on the case, is treated, while the surrounding healthy tissue and bone are preserved. Because the incision is smaller than with a total knee replacement, patients typically stay in the hospital for just one to two days.

Rehabilitation usually begins almost immediately after surgery, with physical therapy helping to restore the knee's range of motion and strength. In the early days, care focuses on managing pain with medication, icing the knee to reduce swelling, and elevating the leg, while patients are gradually encouraged back toward walking and low impact activity. Most people return to light, low impact activities within six to eight weeks, while complete recovery, including regaining full strength and mobility, generally takes three to six months. Sticking closely to the physiotherapy plan is one of the biggest factors in how smoothly and quickly this recovery goes.

Benefits of Partial Knee Replacement

• Faster recovery: Because only part of the knee is replaced, patients typically recover faster than with a total knee replacement.
• Less pain: Patients usually experience less postsurgical pain than with a total knee replacement.
• Less invasive procedure: It needs a smaller incision.
• Less tissue disruption: There is less damage to the surrounding muscle and tissue.
• Preserves natural structures: More of the knee's natural bone and ligaments are kept.
• More natural feel: Preserving the natural structures tends to give a more natural feel and movement after surgery.

Longevity varies depending on the patient's activity level, weight, and overall health, but modern implants are generally designed to last ten to fifteen years, with some lasting considerably longer. Regular checkups with your orthopedic surgeon help ensure the implant stays in good condition, and more active individuals may see wear develop somewhat sooner than those with a more sedentary lifestyle.

As with any surgical procedure, partial knee replacement carries some risk. Infection at the incision site or within the joint is possible, though uncommon, and is reduced through sterile technique and proper wound care. Blood clots can form in the legs after surgery, and early mobility, physiotherapy, and blood thinning medication where appropriate help prevent this. Over time, the implant may loosen or wear, which can eventually require further surgery to correct. Your surgeon can walk you through which of these risks are most relevant to your specific case.

Dr. Vijay Kumar Sohanlal is a knee and hip replacement surgeon with over eighteen years of experience at MAHI Hospitals in Chennai, specializing in robotic assisted, navigation guided, and minimally invasive knee surgery. His training includes fellowships in joint replacement surgery in Mumbai, Germany, and Australia, and he has treated more than twelve thousand patients across his career.

For his full qualifications, career history, and professional memberships, see the why choose us page and his profile as an orthopedic surgeon in Kilpauk.

Locations

MAHI Hospitals, No. 118, Poonamallee High Road, Vepery, Chennai 600084. Phone: +91 91597 11355 

Partial knee replacement is an effective surgical option for people struggling with knee pain and stiffness caused by localized arthritis. It offers quicker recovery, reduced postsurgery discomfort, and preservation of natural knee structures compared to a full replacement. Consulting an experienced orthopedic surgeon is the best way to find out whether this approach is the right fit for your knee.