Muscular strength after extensive operative treatment of congenital talipes equinovarus.

Maximum isometric voluntary contraction (MIVC) strength of muscles (extensors, plantar flexors, pronators and supinators of the foot) in children with congenital talipes equinovarus who underwent extensive operative treatment was evaluated. The first group consisted of 28 children (50 clubfeet) operated on with posteromedial-lateral release aged 7 months to 76 months (mean, 22 months), with mean follow-up period of 85 months. The second group consisted of 32 children (39 clubfeet) operated on with complete subtalar release from Cincinnati incision aged from 3 months to 50 months (mean, 11 months), with mean follow-up period of 51 months. In both groups, the muscles moving the foot in the sagittal and coronal plane showed a decreased MIVC. The greatest deficit was observed in the supinators and extensors, less in the pronators and plantar flexors. Better results were accompanied by greater MIVC, but significant relations existed in the first group between the strength of the extensors and the quality of results (better results correlated with better MIVC of the extensors). No significant differences between both patient groups were noted. For the plantar flexors, the difference of the MIVC strength between the normal and affected feet is stable; instead, for the extensors, supinators and pronators, it increases in the analyzed age interval.