The Relationship between Motor Unit Excitability and Muscle Strength before and after Meniscestomy

2014 Rigakuryoho Kagaku  
Purpose] This study analyzed F-waves to clarify the relationship between muscle strength recovery and motor unit reorganization before and after meniscestomy in a patient with a meniscus injury and investigated changes in lower extremity spinal motor neuron excitability. [Subject] The subject was a female patient with a meniscus injury. [Methods] Thirty-second F-wave samples from the abductor hallucis were recorded bilaterally after stimulation of the tibial nerve at the ankle with the subject
more » ... e with the subject in a supine position, and manual muscle testing and thigh circumference measurements were performed before the operation and 1, 2, and 6 months later. The F-waves were analyzed for persistence, latency, and duration over 30 trials. The value of each sample was calculated relative to the value on the healthy side, which was set as 100%. [Results] Persistence values did not change among the readings. Latency and duration values were shorter from before the operation to 2 months after, but were the same as those on the healthy side at 6 months after the operation. Muscle strength and thigh circumference had increased 6 months after the operation. [Conclusion] These findings indicate that latency and duration values, as well as muscle strength and thigh circumference measurements had changed by 6 months after the operation, suggesting a relationship between motor units and muscle strength.
doi:10.1589/rika.29.1033 fatcat:wgwnot4qzjc4nfz3xcv5vgblie