Classication of muscles fibers and ultra-structural study on adductor magnus muscles in children with spastic hip adduction from cerebral palsy

Objective To study ultrastructural damages and classification of types in muscles fibers in the adductor magnus muscles with spastic hipadduction of cerebral palsy. Methods Specimens of the adductor magnus muscles were ta ken from 16 surgically treated children with spastic hip adduction of cerebral palsy,histochemistry examined with muscles globulin ATP ase olye for the classification of muscles fibers and ultra structure also studied. Results The type I fibers,slow twitch fibers,were found to occupy a significantly higher ratio(70.92%)than controls( 57.93% ),and were often gathered to form type grouping.Ultra structural damages were found in all of the specimens. Conclusion It is suggested that these abnormalities are one of the factors a which cause spastic contraction of muscles without long term effects by surgical treatment.The reason which leads to transformation of the fiber types needs further investigation.