• Ji-Yong Ahn, Ho-Seong Lee, Chul-Ho Kim, Jin-Pil Yang, and Soo-Sung Park.
• Department of Orthopaedic Surgery, Asan Medical Center Children's Hospital, University of Ulsan, College of Medicine, Seoul, South Korea.
• Foot Ankle Int. 2014 Jul 1; 35 (7): 677-82.

BackgroundWe investigated radiographic changes of calcaneocuboid (CC) joint subluxation following calcaneal lengthening procedure for the treatment of pediatric planovalgus foot deformities.MethodsThis 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.ResultsAll 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.ConclusionAt midterm follow-up, the CC joint subluxation was gradually resolving over time, with no evidence of osteoarthritic change in the CC joint.Level Of EvidenceLevel IV, case series.© The Author(s) 2014.

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