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Among these, 29 patients with unilateral HCO were enrolled and 19\u00a0were available for review at a mean of 14.2 years (10 to 15.7) post-operatively. For these 19 patients, the mean Hospital for Special Surgery knee score was 60 (57 to 62) pre-operatively and 85 (82 to 87) at final follow-up (p &lt; 0.001; paired t-test). The femorotibial angle and tibial inclination angle (IA) were measured at short-term follow-up, one to four years post-operatively, and showed no significant subsequent changes. The clinical scores and radiological measurements showed little change over time. One patient required conversion to total knee replacement during this time. These results suggest that the coronal angle achieved at operation is maintained at long-term follow up after HCO without alteration of the IA, providing a good long-term clinical outcome. <\/jats:p><jats:p> Cite this article: Bone Joint J 2014;96-B:467\u201372. <\/jats:p>","DOI":"10.1302\/0301-620x.96b4.31345","type":"journal-article","created":{"date-parts":[[2014,4,1]],"date-time":"2014-04-01T10:08:50Z","timestamp":1396346930000},"page":"467-472","update-policy":"http:\/\/dx.doi.org\/10.1302\/crossmark-policy","source":"Crossref","is-referenced-by-count":6,"title":["The long-term outcome of open-wedge osteotomy of the proximal tibia with hemicallotasis"],"prefix":"10.1302","volume":"96-B","author":[{"given":"E.","family":"Nakamura","sequence":"first","affiliation":[{"name":"Kumamoto University, Department\rof Orthopaedic Surgery, Faculty of Life Sciences, 1-1-1\rHonjo, Chuo-ku, Kumamoto-City, Kumamoto, 860-8556, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"N.","family":"Okamoto","sequence":"additional","affiliation":[{"name":"Kumamoto University, Department\rof Orthopaedic Surgery, Faculty of Life Sciences, 1-1-1\rHonjo, Chuo-ku, Kumamoto-City, Kumamoto, 860-8556, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"H.","family":"Nishioka","sequence":"additional","affiliation":[{"name":"Kumamoto University, Department\rof Orthopaedic Surgery, Faculty of Life Sciences, 1-1-1\rHonjo, Chuo-ku, Kumamoto-City, Kumamoto, 860-8556, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"T.","family":"Karasugi","sequence":"additional","affiliation":[{"name":"Kumamoto University, Department\rof Orthopaedic Surgery, Faculty of Life Sciences, 1-1-1\rHonjo, Chuo-ku, Kumamoto-City, Kumamoto, 860-8556, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J.","family":"Hirose","sequence":"additional","affiliation":[{"name":"Kumamoto University, Department\rof Medical Information Science and Administration Planning, 1-1-1\rHonjo, Chuo-ku, Kumamoto-City, Kumamoto, 860-8556, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"H.","family":"Mizuta","sequence":"additional","affiliation":[{"name":"Kumamoto University, Department\rof Orthopaedic Surgery, Faculty of Life Sciences, 1-1-1\rHonjo, Chuo-ku, Kumamoto-City, Kumamoto, 860-8556, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"42","reference":[{"key":"r1","doi-asserted-by":"crossref","first-page":"192","DOI":"10.3928\/01477447-20120123-08","volume":"35","author":"Haviv B","year":"2012","journal-title":"Orthopedics"},{"key":"r2","doi-asserted-by":"publisher","DOI":"10.1002\/art.24466"},{"key":"r3","doi-asserted-by":"publisher","DOI":"10.1177\/0363546505286144"},{"key":"r4","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-200301000-00013"},{"key":"r5","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.93B7.26124"},{"key":"r6","first-page":"205","volume":"72","author":"Turi G","year":"1987","journal-title":"Chir Organi Mov"},{"key":"r7","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2474-10-154"},{"key":"r8","doi-asserted-by":"publisher","DOI":"10.1007\/s00402-006-0130-9"},{"key":"r9","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-197658060-00003"},{"key":"r10","doi-asserted-by":"publisher","DOI":"10.1136\/ard.16.4.494"},{"key":"r11","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-197456010-00016"},{"key":"r12","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.83B8.0831111"},{"key":"r13","first-page":"739","volume":"80","author":"Perusi M","year":"1994","journal-title":"Rev Chir Orthop Reparatrice Appar Mot"},{"key":"r14","doi-asserted-by":"publisher","DOI":"10.1080\/00016470410001475"},{"key":"r15","unstructured":"Huo MH. 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