title: Letter to editor.
authors: Rodney
authors: R
authors: Grahame
authors: Rosemary
authors: R
authors: Keer
authors: Jane
authors: J
authors: Simmonds
mesh_terms: D005260:Female; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology*; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D004856:Postural Balance / Q000502:physiology*