An account of the authors' experience in strength measurement using a hand-held dynamometer in 16 patients with Duchenne muscular dystrophy (DMD) is given. A rapid decrease of knee extension strength was observed, between 6 and 8 years of age, analysing among patients of different ages. At the same time loss of the ability to walk has occurred. An unexplainable increase in strength was observed in two patients examined in a six month interval. A short review of the literature is given and the conclusion of the importance on the wider use of the instrument.
muscular function; myometry; Duchenne muscular dystrophy