Unicompartmental knee arthroplasty in patients under the age of 60 years provides excellent clinical outcomes and 10-year implant survival: a systematic review: a study performed by the Early Osteoarthritis group of ESSKA-European Knee Associates section - Kyriakidis, T; Asopa, V; Baums, M; Verdonk, R; Totlis, T (Knee Surg Sports Traumatol Arthrosc, 2023)