Fig. 4From: Trends in knee surgery research in the official journal of the Korean Knee Society during the period 1999–2018: a bibliometric reviewPie chart demonstrating the percentage of categories by surgery. APCL anterior or posterior cruciate ligament, AS arthroscopy, HTO high tibial osteotomy, TKA total knee arthroplasty, UKA unicompartmental knee arthroplastyBack to article page