”The results of this unicondylar replacement surgery are simply wonderful,” said patient Ms. Wang, as did almost everyone familiar with her. A year ago, 68-year-old Ms. Wang was diagnosed with unicompartmental osteoarthritis of the right knee, and several hospitals said she would be treated with an artificial total knee replacement, but Ms. Wang was older, had poor cardiopulmonary function, and was afraid of artificial total knee replacement. When she learned that our hospital could treat unicompartmental osteoarthritis in the knee with a micro-innovation method, she was overjoyed and skeptical, so she took the treatment with a try. After the surgery, Ms. Wang’s recovery was smooth, and the pain at the surgical site was very mild, and basically disappeared 3 days after the surgery. With the development and advancement of joint replacement technology, a minimally invasive procedure, unicondylar knee arthroplasty (UKA), is gaining more and more recognition from patients and doctors, bringing a boon to patients with severe osteoarthritis in the unicompartmental knee joint. Compared with total knee arthroplasty, unicondylar arthroplasty replaces only the tibial articular surface of the diseased compartment of the knee, resulting in a small incision, no need to turn the patella, avoiding damage to the suprapatellar capsule and thus reducing postoperative pain; the amount of osteotomy and bleeding is only one-fourth of that of total knee replacement, and the anterior and posterior cruciate ligaments are preserved, leaving the occlusion of the patellofemoral joint intact and allowing rapid and complete recovery of joint flexion after surgery. The patient avoided blood transfusion during the unicondylar replacement and was able to walk without crutches the day after the surgery, and was able to walk normally within 2 weeks, and the joint function recovered closer to the physiological state after 2 months. This procedure has relieved joint pain for many patients who are not in a position to have total knee replacement or are afraid of the risk of total knee replacement, and is very popular among patients. Since its establishment, the Fourth Orthopedic, Joint and Sports Medicine Unit has adhered to the concept of “minimally invasive treatment and pain-free ward” and applied arthroscopy, combining the techniques of orthopedics, minimally invasive surgery and sports trauma to treat various joint and intra-articular diseases. We are the first in Northeast China to carry out unicompartmental surface replacement of knee (including unicondylar replacement and patellofemoral joint replacement), orthopedic surgery for severe internal and external knee deformity, artificial joint replacement for severe rheumatic and rheumatoid osteoarthritis, difficult hip prosthesis loosening and revision surgery, and arthroscopic reconstruction surgery for preserved ligament stump, etc. This marks that our joint sports medicine is at the international advanced and domestic leading level.