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The Modified Modified Ashworth Scale (MMAS) is a clinical instrument for measuring spasticity. Few studies have been performed on the reliability of the MMAS. The aim of the present study was to in vestigate the intrarat er reliability of the MMAS for the assessment of spas ticity in the lower li mb. We conducted a test-retest study on sp asticity in the hip adductors, knee extensors, and ankle plantar flexors. Each patient was measured by a hospital-based clinical physiotherapist. Twenty-three patients with stroke or multiple sclerosis (fourteen women, nine men) and a mean+/–standard deviation age of 37. 3+/–14.1 years participated. The weighted kappa was moderate for the hip adductors (weighted kappa= 0.45, standard error [SE]= 0.16, p= 0.007), good for the knee extensors (weighted kappa= 0.62, SE= 0.12, p< 0.001), and very good for the ankle plantar flexors (weighted kappa= 0.85, SE= 0.05, p< 0.001). The kappa value for overall ag reement was very good (weigh ted kappa= 0.87, SE= 0.03, p< 0.001). The reliability for the ankle plantar flexors was significantly higher t han that fo r the hi p adductors. The intrarater reliability of the MMAS in patients wit h lower-limb muscle spasticity was very good, and it can be used as a measure of spasticity over time.