Abstract

Neurological deficit resulting in the lack of motor control in children with myelomeningocele often leads to a valgus position of the feet and ankles, usually in combination with planovalgus and pronation of the forefoot. The purpose of the study was to evaluate long-term patient satisfaction and clinical effects in ambulating children with lumbosacral myelomeningocele after having performed a Grice arthrodesis of a valgus unstable foot. The clinically most relevant radiographic measurements, such as the frontal and lateral talo-calcaneal angles, were used to evaluate the anatomical effects of the surgery, whereas the main research question was to reveal the patient satisfaction and usefulness of the procedure. The modified Grice-Green extraarticular subtalar arthrodesis was performed by the same surgeon on one standing and 22 walking patients (12 female) with lumbosacral myelomeningocele and valgus instability during the period 1985-1999. Twelve patients had bilateral surgery, giving a total of 35 operated feet. The patients attended a thorough check-up at a mean of 12.8 years (standard deviation [SD] +/- 3.2, range 7.7-20.2 years) after surgery. The mean age at surgery was 6.6 years (SD +/- 1.8) and at follow-up 19.4 years (SD +/- 3.8). Functional parameters, such as walking ability, pain and skin problems, and the need for braces and supportive orthopaedic shoes were noted at the follow-up interview. The parents were interviewed along with the patients in order to obtain all of the necessary information. Loaded radiographs in the lateral and frontal planes were taken of both feet and ankles pre-operatively and at follow-up, except for pre-operative radiographs in six patients that were not loaded and, thus, not included, except for the assessment of ankle valgus. Ankle valgus was assessed from lateral and frontal views of the ankle on a scale from grade 0 to grade 3 according to Malhotra. Frontal and lateral talo-calcaneal angles were measured for the assessment of subtalar varus or valgus. Lateral talo-first-metatarsal (Meary's) angles were measured to investigate the longitudinal arches of the feet. The mean lateral talo-calcaneal angle was reduced significantly (P < 001) from 55.1 degrees (SD +/- 8.9) to 38.8 degrees (SD +/- 8.1). The mean frontal talo-calcaneal angle was reduced from 24.7 degrees (SD +/- 9.7) pre-operatively to 16.6 degrees (SD +/- 6.3) at follow-up (P < 0.001). The mean lateral talo-first-metatarsal angle improved significantly from -16.1 degrees (SD +/- 24.7) pre-operatively to 0.9 degrees (SD +/- 15.1) at follow-up (P = 0.0015). The calcaneal pitch did not change significantly. In general, ankle valgus worsened during follow-up time, but not significantly (P = 0.113). The visual analogue scale (VAS) score of patient satisfaction improved significantly from 3.7 (SD +/- 1.7) prior to surgery to 7.2 (SD +/- 1.5) at follow-up (P < 0.005). Nineteen patients (83%) were satisfied with the surgery and would thus recommend the procedure. Based on the radiological findings and patient satisfaction, the patients participating in this study benefited from having had Grice arthrodeses performed on their valgus unstable feet. The results indicate good long-term correctional effect on valgus deformity after Grice arthrodesis, as the talo-calcaneal and talo-first-metatarsal angles improved significantly. A great majority of the patients were content with the surgery, and none claimed that any residual deformity was the cause for any reduced ability to ambulate.

Highlights

  • Neurological deficit resulting in the lack of motor control in children with myelomeningocele often leads to a valgus position of the feet and ankles, usually in combination with planovalgus or pronation of the forefoot

  • A modified Grice–Green extraarticular subtalar arthrodesis was performed on 22 walking patients and one standing patient with lumbosacral myelomeningocele and foot valgus instability during the period 1985–1999

  • When Grice introduced the extraarticular arthrodesis of the subtalar joint in 1952 [1, 20], it was originally devised to treat children with polio

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Summary

Introduction

Neurological deficit resulting in the lack of motor control in children with myelomeningocele often leads to a valgus position of the feet and ankles, usually in combination with planovalgus or pronation of the forefoot. This deformity may be difficult to correct by orthoses alone, and surgical correction may be needed to enable the child to walk. The neurological condition deteriorates during childhood in some cases due to complications from tethered cord releases, hydrocephalus treatment and scoliosis corrections, and the neurological status cannot in all cases be regarded as non-progressive

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