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The exclusion criteria were: previous fracture, fixation of slipped capital femoral epiphysis or osteotomy in the ipsilateral femur; PFDO associated to varus or valgus osteotomy; T\u00f6nnis grade 2 or 3 osteoarthritis; and PFDO performed to treat knee abnormalities. Hip function was assessed through the modified Harris Hip Score (mHHS). A subgroup of consecutive patients with low back pain before the PFDO and operated after 2017 had the spine function assessed through the Oswestry disability index (ODI).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      A total of 37 hips (34 patients) were studied: 15 hips with increased femoral torsion and 22 with decreased femoral torsion. Eight patients were male and 26 were female. The average age at PFDO was 33 years (range, 15\u201054 years). At a mean follow\u2010up of 24 months (range, 12\u201065 months), the mean mHHS improved from 58.1 \u00b1 14.3 before PFDO to 82 \u00b1 15.6 at the most recent follow\u2010up (\n                      <jats:italic>P<\/jats:italic>\n                      &lt; .001). Improvement in the mHHS above the minimum clinically important difference (MCID) was observed in 33 hips (89%). In the subgroup of 14 consecutive patients with ODI available, the ODI improved from a mean of 45% \u00b1 16% before the PFDO to 22% \u00b1 17% at the most recent follow\u2010up (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .001). Nine (64.3%) of the 14 patients presented improvement in the ODI above the MCID. Revision procedure with a larger intramedullary nail was necessary in 2 hips to treat nonunion.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Proximal femoral derotation osteotomy improves the hip and spine function in patients with increased or decreased femoral torsion and nonarthritic hips.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Level of Evidence<\/jats:title>\n                    <jats:p>Level IV, therapeutic case series.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1016\/j.arthro.2020.08.008","type":"journal-article","created":{"date-parts":[[2020,8,20]],"date-time":"2020-08-20T21:41:20Z","timestamp":1597959680000},"page":"111-123","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":31,"title":["Femoral Derotation Osteotomy Improves Hip and Spine Function in Patients With Increased or Decreased Femoral Torsion"],"prefix":"10.1002","volume":"37","author":[{"given":"Munif","family":"Hatem","sequence":"first","affiliation":[{"name":"Baylor University Medical Center at Dallas Dallas Texas U.S.A."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anthony Nicholas","family":"Khoury","sequence":"additional","affiliation":[{"name":"Baylor University Medical Center at Dallas Dallas Texas U.S.A."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lane Richard","family":"Erickson","sequence":"additional","affiliation":[{"name":"Baylor University Medical Center at Dallas Dallas Texas U.S.A."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alan Leslie","family":"Jones","sequence":"additional","affiliation":[{"name":"Baylor University Medical Center at Dallas Dallas Texas U.S.A."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hal 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