The question of our research is to determine the effectiveness of the physiotherapy and rehabilitation protocol applied in the postoperative period on the knee joint range of motion, functionality, muscle strength around the knee joint (quadriceps/hamstring ratio) and pain parameters in patients who underwent osteochondral allograft transplantation surgery and to include it in the literature. In this direction, the hypotheses of our study are; H0: The physical therapy and rehabilitation protocol to be applied after osteochondral allograft transplantation surgery has a positive contribution to the patient's knee joint range of motion, functionality, muscle strength and pain.

H1: The physical therapy and rehabilitation protocol to be applied after osteochondral allograft transplantation surgery does not have a positive contribution to the patient's knee joint range of motion, functionality, muscle strength and pain.

The treatment protocol to be applied to the patients after surgery was determined. The protocol includes; cold application, game ready device application, CPM device application, patellar mobilization, soft tissue mobilization application, TENS, conventional TENS and NMES application, ultrasound application, stretching exercises, strengthening exercises, mobilization exercises, balance and proprioception exercises, walking training and kinesio taping.

Knee Injury and Osteoarthritis Outcome Score (KOOS): A health measure used to evaluate knee injuries and knee-related conditions such as osteoarthritis. The KOOS comes in a widely used questionnaire format to assess patients' knee function, pain, quality of life, and other symptoms. By measuring problems in subcategories such as pain, symptoms, quality of life, functional limitations, and sports/dialysis activities, it provides healthcare professionals with an important tool to monitor patients' response to treatment, evaluate treatment plans, and understand patients' quality of life.

The Oxford Knee Score (ODS) is a valid and reliable questionnaire with a Turkish version that allows individuals with knee OA to assess their own function and pain. It is scored on a Likert scale from 0 (absent) to 4 (severe) (0-48). In this questionnaire consisting of 12 questions, questions 2, 3, 7, 11 and 12 assess functional status; questions 1, 4, 5, 6, 8, 9 and 10 assess pain-related status. Scores from ODS pain questions range from 0 to 28 points, with the lowest score being 0 and the highest score being 28. Scores from ODS function 30 parameters range from 0 to 20 points, with the lowest score being 0 and the highest score being 20. High scores indicate worse functional status and pain.