title: Calcaneocuboid Joint Subluxation After the Calcaneal Lengthening Procedure in Children.
abstract: BACKGROUND
  We investigated radiographic changes of calcaneocuboid (CC) joint subluxation following calcaneal lengthening procedure for the treatment of pediatric planovalgus foot deformities.
  
  
  METHODS
  This study included 44 cases of planovalgus foot deformities in 24 patients with mean age of 9.7 (range, 8 to 13) years who underwent calcaneal lengthening between 1999 and 2011. The mean follow-up period was 25 (range, 12 to 159) months. Anteroposterior (AP) and lateral radiographs of the weight-bearing view of the foot from immediate postoperative, 3-month postoperative, and last follow-up evaluations were reviewed and also used for trend analysis. Percentage of CC joint subluxations was measured on both AP and lateral view of the foot. Correlations between the percentage of CC joint subluxation and follow-up periods were assessed.
  
  
  RESULTS
  All of the feet showed dorsal subluxation of their CC joint on the immediate postoperative lateral plain radiographs. The median percentage of dorsal subluxation of the CC joint improved from 26.0% (range, 10.0 to 67.0) at the immediate postoperative evaluation to 16.5% (range, 7.0 to 47.0, P = .0001) at the 3-month postoperative evaluation and to 11% (range, 2.0 to 30.0, P = .0003) at last follow-up. The trend analysis over time indicated that the CC joint subluxation percentage with calcaneal lengthening generally decreased over time (r s = -.67, P = .001). No patients showed osteoarthritic changes in the CC joint or nonunion at the calcaneal osteotomy site at last follow-up.
  
  
  CONCLUSIONS
  At midterm follow-up, the CC joint subluxation was gradually resolving over time, with no evidence of osteoarthritic change in the CC joint.
  
  
  METHODS
  Level IV, case series.
authors.affiliation: Department of Orthopaedic Surgery, Asan Medical Center Children's Hospital, University of Ulsan, College of Medicine, Seoul, South Korea.
authors.forename: Ji-Yong
authors.initials: JY
authors.lastname: Ahn
authors.affiliation: Department of Orthopaedic Surgery, Asan Medical Center Children's Hospital, University of Ulsan, College of Medicine, Seoul, South Korea.
authors.forename: Ho-Seong
authors.initials: HS
authors.lastname: Lee
authors.affiliation: Department of Orthopaedic Surgery, Asan Medical Center Children's Hospital, University of Ulsan, College of Medicine, Seoul, South Korea.
authors.forename: Chul-Ho
authors.initials: CH
authors.lastname: Kim
authors.affiliation: Department of Orthopaedic Surgery, Asan Medical Center Children's Hospital, University of Ulsan, College of Medicine, Seoul, South Korea.
authors.forename: Jin-Pil
authors.initials: JP
authors.lastname: Yang
authors.affiliation: Department of Orthopaedic Surgery, Asan Medical Center Children's Hospital, University of Ulsan, College of Medicine, Seoul, South Korea sspark@amc.seoul.kr.
authors.forename: Soo-Sung
authors.initials: SS
authors.lastname: Park
mesh_terms: D000293:Adolescent; D001852:Bone Lengthening / Q000379:methods; D002111:Calcaneus / Q000000981:diagnostic imaging / Q000601:surgery*; D002648:Child; D005260:Female; D005500:Follow-Up Studies; D005531:Foot Deformities, Acquired / Q000000981:diagnostic imaging* / Q000209:etiology; D006801:Humans; D007593:Joint Instability / Q000000981:diagnostic imaging* / Q000209:etiology; D008297:Male; D010027:Osteotomy; D011183:Postoperative Complications / Q000000981:diagnostic imaging*; D011859:Radiography; D013640:Tarsal Joints / Q000000981:diagnostic imaging / Q000601:surgery
keywords: calcaneal lengthening; calcaneocuboid joint; children; planovalgus foot; subluxation