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Representative patient of D group (48-year-old woman). (A) Arthroscopic findings at HTO showed slight fibrillation of patellofemoral cartilage (ICRS grade 1). (B) At hardware removal, osteoarthritis of patellofemoral cartilage was worse (ICRS grade 3). HTO = high tibial osteotomy, ICRS = International Cartilage Repair Society.
