EMG-Untersuchungen nach Frakturen der unteren Extremität im Kindesalter
Auch gedruckt in der BibliothekZ: J-H 14.281; W: W-H 12.733
Ressourcen- / MedientypDissertation, Text
Datum der Freischaltung2011-12-06
Length and torsion discrepancies after leg fractures in children are a frequent problem. The consequences for the affected children vary from pain during walking to the necessity of early joint replacement caused by arthrosis. Aim: Surface electromyography - a radiation-free and painless method ideal for follow-up studies in children was investigated to detect posttraumatic deformities after these fractures. Method: 34 children with a mean age of 9.2 years at time of fracture were examined 6.3 years after operation. At first length and torsion of the leg were defined by 2.5D-ultrasound followed by an simultaneous treadmill gait-analysis and detection of surface-EMG of 5 leg-muscles at two different speeds (2,5 m/s and 4 m/s). According to the ultrasound results the children were separated into 4 groups (normal leg-geometry, isolated length-deformity, isolated torsional-deformity, combined length- and torsional-deformity). Parameters of gait-analysis (time of gait cycle, stance and swing-phase) and EMG-activity were compared for each group. Results: Gait-cycle of the fractured leg was almost equal at the fractured leg compared to the non-fractured. At higher speed gait cycle shortened in all groups but remained in physiological range. EMG-activity was elevated at the fractured leg compared to the non-fractured in all groups except from isolated torsional deformity of the leg. At higher speed levels of activity remained constant. Conclusions: Gait parameters showed no differences at the fractured leg. EMG-activity was mostly higher at the fractured leg. There is no coherence between pathologic leg geometry and gait parameters as well as muscle activation.
LizenzStandard (Fassung vom 01.10.2008)
Fractures. In infancy and childhood