Outcomes of Calcaneal Lengthening Osteotomy in Ambulatory Patients with Cerebral Palsy and Planovalgus Foot Deformity.

Abstract

Background: To date, no studies have evaluated the longevity of calcaneal lengthening osteotomy (CLO) in patients with cerebral palsy (CP) and pes planovalgus. This study aimed to explore the changes in foot alignment following CLO in patients with CP, utilizing both radiographic evaluations and dynamic foot-pressure assessments.

Methods: A retrospective study of 282 feet in 180 ambulatory patients was performed. The mean patient age at the surgical procedure was 8.9 ± 2.6 years. The mean follow-up period was 8.0 ± 4.3 years, and the mean age at the final follow-up 16.9 ± 4.4 years. Weight-bearing radiographs at 3 separate time points (before the surgical procedure, 6 months postoperatively, and at the final follow-up) were used. The feet were classified as corrected, undercorrected, or overcorrected on the basis of the radiographic parameters.

Results: At the final follow-up, we classified 98 feet (34.8%) as corrected, 58 (20.6%) as undercorrected, and 126 (44.7%) as overcorrected. Foot-pressure analysis demonstrated that the undercorrected feet had higher relative vertical impulses in the medial forefoot and medial midfoot than in the other groups, whereas the overcorrected feet had higher impulse in the lateral midfoot. There were no significant differences in preoperative radiographic parameters between the 3 groups, except for the calcaneal pitch angle. At 6 months after the surgical procedure, we classified 181 feet (64.2%) as corrected, 58 (20.6%) as undercorrected, and 43 (15.2%) as overcorrected. However, 53.6% of initially corrected feet changed to being undercorrected or overcorrected during further follow-up, 43.1% of the undercorrected feet became corrected or overcorrected, and 16.3% of the overcorrected feet became corrected. A younger age at the surgical procedure and lower naviculocuboid overlap at 6 months after the surgical procedure were the risk factors for overcorrection.

Conclusions: Although CLO is an effective method for correcting planovalgus foot deformities and enhancing foot-pressure distribution, the extent of correction observed early after the surgical procedure was not necessarily sustained over the follow-up period in individuals with CP. Furthermore, our findings highlight a noticeable tendency toward the overcorrection of the deformity, as evidenced by increased pressure exerted on the lateral midfoot.

Level of evidence: Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.