The patient is a 70-year-old female with a long history of knee osteoarthritis, presenting with chronic pain, swelling, and limited range of motion in her right knee. Conservative treatments, including physical therapy and medications, failed to provide relief. She underwent a successful total knee arthroplasty under spinal anesthesia. The surgery lasted approximately 2 hours without complications. Postoperative care included pain management, early mobilization, and physical rehabilitation. At 3-month follow-up, the patient reported significant pain reduction and improved knee function, enabling her to resume daily activities independently.