Chronos vivify spacer

In the HTO group, a longitudinal skin incision was created at the medial side of the tibial tuberosity. The superficial medial collateral ligament was completely released below the osteotomy site. Biplanar medial open wedge osteotomy was performed using the ChronOS vivify spacer (DePuy Synthes, Solothurn, Switzerland) and TomoFix plate (DePuy Synthes). The target correction angle was measured at the point where the mechanical axis of the lower limb passed through the Fujisawa point, which was 62.5% from the medial tibial articular margin16) (link).
In the UKA group, a standard medial parapatellar arthrotomy was performed. UKA was performed without extension to the vastus medialis obliquus and without patella eversion. The sigma unicompartmental knee prostheses (DePuy, Warsaw, IN, USA) were applied in all patients in the UKA group.

The surgical indication was medial knee arthritis accompanied by mild varus deformity found in weight bearing radiographic evaluation. In addition, we selected patients who had no osteophyte in the lateral compartment, who had reasonable joint space preservation and who had medial meniscus damage alone. Arthroscopy with microfracture was performed in each patient preoperatively and partial meniscectomy or suture was performed when medial meniscus damage was found. Surgeon pulled the torn meniscus with an arthroscopic probe and decided partial meniscectomy or suture.
A longitudinal skin incision was made on the medial side of the tibial tuberosity. The superficial medial collateral ligament was completely released below the osteotomy site. Biplanar medial open wedge osteotomy was performed using chronOS vivify spacer (DePuy Synthes, Solothurn, Switzerland) and TomoFix plate (DePuy Synthes). Target correction angle was measured at the point where the mechanical axis of the lower limb passed through the Fugisawa point, which is 62.5% from the medial tibial articular margin.