HKA angle: (2009). "Association between knee alignment and knee pain in patients surgically treated for medial knee osteoarthritis by high tibial osteotomy. A one year follow-up study". BMC Musculoskeletal Disorders10 (1). DOI:10.1186/1471-2474-10-154. ISSN1471-2474.
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Authors of source article: Hiroshi Inui, Shuji Taketomi, Kensuke Nakamura, Seira Takei, Hideki Takeda, Sakae Tanaka and Takumi Nakagawa