[Diagnosis and treatment of periprosthetic fracture after medial unicompartmental knee arthroplasty].

Unicompartmental knee arthroplasty (UKA) is an effective treatment for end-stage anteromedial osteoarthritis of the knee. Medial tibial plateau fracture or femoral condyle fracture may occur after UKA, and its treatment is very challenging. The causes leading to this complication include: surgical technique errors, such as the weakening of posterior cortical strength of the tibial platform during operation, the reduction of bone mass due to too much tibial osteotomy, and the stress concentration in the bone bed due to bad alignment of the prosthesis, etc. Prosthesis design factors, such as press-fit fixation design of cementless UKA prosthesis, and multiple nail holes fixation for tibial osteotomy guide, etc. And the morphology of tibial plateau, such as tibial platform in Asian people with narrow and small shap and medial overhanging condyles. Correct selection of patients, strict surgical principles and standardized surgical techniques are the keys to prevent periprosthetic fractures during and after medial UKA. After the diagnosis is confirmed, the treatment choice mainly depends on the fracture pattern and the stability of the prosthesis.