I have just become friendly with someone whose dc has a condition which affects muscle development, mostly in the shoulders, arms and hands (or at least in this child's case). The mum said the condition was called 'arthro....' - it sounded like arthropogrosis which I'm sure I've misheard as I can't find it on google
Apparently it's somewhere between arthritis and cerebral palsy.
Does anyone have any knowledge of this?