What happens during partial knee replacement?
During a partial knee replacement, also known as unicompartmental knee replacement or partial knee arthroplasty, only a specific portion of the knee joint is replaced with artificial components. This procedure is typically performed when one compartment of the knee joint is significantly damaged due to conditions such as osteoarthritis, while the other compartments are relatively healthy. The goal of a partial knee replacement is to alleviate pain, restore function, and improve the overall quality of life for the patient.
Here is a general overview of what happens during a partial knee replacement:
Preparation: Before the surgery, the patient is thoroughly evaluated through physical examination, imaging studies (such as X-rays or MRI), and medical history review. This helps the surgeon determine if the patient is a suitable candidate for a partial knee replacement.
Anesthesia: The patient is administered either general anesthesia (puts the patient to sleep) or regional anesthesia (numbs the lower body) to ensure they are comfortable and pain-free during the procedure.
Incision: The surgeon makes a small incision over the affected compartment of the knee joint.
Access to the Joint: The surgeon carefully moves muscles, tendons, and ligaments aside to access the damaged compartment of the knee joint while leaving the healthy portions untouched.
Reshaping: The damaged bone and cartilage within the affected compartment are removed using specialized tools. The remaining bone surfaces are prepared to accommodate the artificial components.
Component Placement: Metal and plastic implants, often made of cobalt-chrome or titanium, are then placed in the prepared areas of the bone. These implants mimic the natural anatomy of the knee joint and work together to create a smooth joint surface.
Stabilization: The implants are secured in place using cement or are designed to bond directly with the bone over time through a process called osseointegration.
Closure: After ensuring proper implant placement and stability, the surgeon closes the incision with sutures or staples. Sometimes, a small drainage tube may be inserted to help remove excess fluid from the surgical site.
Recovery and Rehabilitation: Following surgery, the patient is taken to a recovery area where they are closely monitored as they wake up from anesthesia. Physical therapy and rehabilitation play a crucial role in the recovery process, helping the patient regain strength, mobility, and function in the affected knee. Patients are typically encouraged to bear weight on the knee shortly after surgery, but the intensity and progression of activities depend on the surgeon’s guidance.
Long-Term Care: Partial knee replacements can provide significant relief from pain and improved joint function. However, like all surgical procedures, there are potential risks and considerations. Patients need to follow their surgeon’s recommendations for post-operative care, which may include exercises, medication, and regular follow-up appointments.