 This study presents a new absorbable spacer for medial compartmental knee osteoarthritis, OA, that provides adequate stability during open-wedge high tibial osteotomy, HTO, and proximal fibula osteotomy. The functional and radiographic results of patients treated with the novel surgical technique were evaluated to investigate its clinical feasibility, and the study found that the spacer improved both the radiographic appearance and the function of the knee in patients with knee OA. This article was authored by Rui Pingzhong, Chiluan Li, Ying Chaoying, and others.