• Taotao Hui, Zhi Bo Chang, Feng Han, and Yongjun Rui.
• Department of orthopedics, The Wuxi Ninth People's Hospital affiliated to Soochow University, Wuxi, Jiangsu, China McGill University, Montreal, QC, Canada Department of Orthopedics, Dalian Municipal Friendship Hospital of Dalian Medical University, Dalian, Liaoning, China.
• Medicine (Baltimore). 2018 Jun 1; 97 (23): e10774e10774.

RationaleMonomelic amyotrophy (MMA) is a benign motor neuron disease with bilateral muscular atrophy in asymmetry and abnormal in the electromyography (EMG). However, we report a case by the muscle biopsy which shows symptoms of slowly progressive amyotrophy despite having a normal EMG.Patient ConcernsA 51-year-old male was diagnosed with a lower limb amyotrophy, insidious at the onset and located in the distal thigh and the proximal crus near the knee, slowly progressive weakness, and wasting of his right gastrocnemius muscle for the last 20 years.DiagnosesHe was diagnosed with MMA by the clinical profile, natural history, examinations, and the biopsy.InterventionsWe perform dynamic physical therapy for the patient in this case.OutcomesThe positive effects of dynamic physical therapy in this case with MMA were shown in this report.LessonsThe outcome of physical therapy is satisfactory.

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