title: Do we need to do overcorrection in Blount's disease?
abstract: OBJECTIVE
  In order to prevent recurrent deformity, overcorrection in Blount's disease has been a common practice by most paediatric orthopaedic surgeons. However, some patients have persistent valgus alignment resulting in awkward deformity. The femoro-tibial angle (FTA) was measured in this series of cases to determine the necessity of such practice.
  
  
  METHODS
  During 1998-2010, patients with Blount's disease stage 2 by Langenskiold, aged from 30 to 40 months who had failed from bracing and underwent valgus osteotomy were included. Seventeen legs had postoperative FTA 7-13° (group 1) and 48 legs had postoperative FTA more than 13° (group 2). ROC curve was used to determine the appropriate FTA that was suitable to prevent recurrence.
  
  
  RESULTS
  Four legs had recurrence (28.6%) in group 1 and six legs (12.5%) had recurrence in group 2. Chi-square test between two groups were not statistically significant in recurrence (p = 0.434). Age and BMI were not statistically significant between recurrent and non-recurrent groups. The ROC curve shows that overcorrection more than 15° did not show benefit to prevent the recurrence in Blount's stage 2.
  
  
  CONCLUSIONS
  Our study showed that the overcorrection group had non-statistically significant recurrence compared to the non-overcorrection group, and overcorrection more than valgus 15° has no benefit to prevent recurrence.
authors.affiliation: Department of Orthopedics Surgery, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand, Peerajite@gmail.com.
authors.forename: Perajit
authors.initials: P
authors.lastname: Eamsobhana
authors.forename: Kamolporn
authors.initials: K
authors.lastname: Kaewpornsawan
authors.forename: Kittipong
authors.initials: K
authors.lastname: Yusuwan
mesh_terms: D001848:Bone Diseases, Developmental / Q000000981:diagnostic imaging* / Q000601:surgery*; D017760:Bone Malalignment / Q000000981:diagnostic imaging / Q000601:surgery; D001915:Braces; D002675:Child, Preschool; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D008297:Male; D055034:Osteochondrosis / Q000151:congenital* / Q000000981:diagnostic imaging / Q000601:surgery; D010027:Osteotomy / Q000379:methods*; D011859:Radiography; D012008:Recurrence; D012189:Retrospective Studies; D012720:Severity of Illness Index; D013977:Tibia / Q000000981:diagnostic imaging / Q000601:surgery; D016896:Treatment Outcome