RESUMO
PURPOSE: Idiopathic clubfoot (ICF) involves structural abnormalities in the lower extremities. Approximately half of patients have unilateral ICF, which could be due to differences in limb formation. The contralateral unaffected foot may have subclinical ICF. The objectives were to compare ankle and foot kinematics and pedobarography findings between the unaffected foot of patients with unilateral ICF and controls. METHODS: Eleven children with unilateral ICF (11 unaffected feet, 11.7 ± 3.8 years) and 15 age-matched controls (30 control feet, 11.1 ± 3.0 years) were enroled. Five complete gait trials were performed. Data were collected using ten cameras and a two m long Footscan system and compared between groups using the Wilcoxon rank sum test. RESULTS: All children with ICF underwent the selective soft tissue release procedure. The unaffected feet showed limited ranges in inversion-eversion and dorsiflexion-plantar flexion on kinematic analysis. There was a delay in landing time in all regions of the foot during heel rise and propulsion. The peak time was achieved significantly later in the unaffected feet compared to the controls. Although plantar pressure parameters were comparable, unaffected feet showed a larger contact area in the midfoot region. CONCLUSIONS: Gait data on the unaffected foot in unilateral ICF patients do not correspond to those of controls despite an indistinguishable clinical appearance. This could be due to the effect of treatment, the process of foot development, or a combination. The relationship between genetics and gait deviation in patients with unilateral ICF needs further evaluation. The unaffected foot should receive similar attention during follow-up.
RESUMO
PURPOSE: Surgery for idiopathic clubfoot, though limited in indications, should be performed by a selective soft tissue release. Aims of the study were to evaluate the pedobarography and ankle kinematics of the clubfoot post-surgery and compare with controls. METHODS: Twenty-two patients (33 clubfeet) and 22 normal children (44 feet) were enrolled into the cross-sectional study. Demographic data were recorded. Plantar force measurements and ankle kinematic data were obtained and compared between clubfoot patients and controls by pedobarography and 3-dimensional gait analysis. RESULTS: Clubfoot patients were operated at an average age of 12.8 ± 8.1 months. The average follow-up was 9.9 ± 3.9 years. Demographic data were comparable between the two groups. The plantar force in clubfoot patients was significantly lower than controls (108.2 ± 86.7 vs. 150.9 ± 73.9 N, p = 0.03). Clubfoot patients demonstrated a longer contact time, larger contact area, lower peak pressure, and force relative to body weight in toe, midfoot, and heel areas. The impulse was comparable between the two groups but the contact area, force, and force time integral concentrated at the midfoot region of the clubfoot. The ankle kinematics in clubfoot patients demonstrated a dorsiflexed position through late toe off. Range of dorsiflexion in the clubfoot was significantly higher than in controls. Foot adduction during stance, limited inversion-eversion, and limited plantar flexion during loading response and toe off were observed. CONCLUSION: The results underscore the importance of limited soft tissue release during clubfoot surgery. Although the procedure could preserve range of motion at the ankle joint, muscle weakness and flatfoot deformity are prevalent.