Assessment of surface electromyographic clinical analysis of selective femoral neurotomy on cerebral palsy with stiff knee.

This study aimed to explore the role of surface electromyography (sEMG) on the changes of myoelectric activities of quadriceps femoris and the assessment of its clinical effect before and after selective femoral neurotomy on spastic cerebral palsy with stiff knee. Selective femoral neurotomy was carried out in 15 patients on 26 sides. The electromyography of quadriceps femoris was recorded before and after the operation. Passive and voluntary movements were performed during recording. The root mean square (RMS) and integrated electromyography (iEMG) was calculated by time domain analysis. Meanwhile, the range of the patients' knee joint motion (ROM) was measured by a joint goniometer. The RMS and iEMG of the quadriceps femoris during passive movement was significantly decreased post-operation when compared to those pre-operation (both P<0.05, n=26). Meanwhile, the RMS and iEMG of the quadriceps femoris during voluntary movement post-operation was significantly reduced than those pre-operation (both P<0.05, n=26). Additionally, total excursion on the sagittal plane and the peak knee flexion in the swing phase were significantly raised post-operation than those pre-operation (both P<0.05, n=26). The spasms in the quadriceps femoris in spastic cerebral palsy patients with stiff knee was clearly improved, and the ROM of the knee was significantly enhanced after the selective femoral neurotomy. Importantly, surface EMG can objectively evaluate the clinical therapeutic effect of spastic cerebral palsy stiff knee as a noninvasive detection method.