how many muscles are in your shoulder

A crazy. left field idea perhaps but,

go to the doctor?

The muscles in the shoulder are all joined to the back muscles. When you imjure one, any movement makes it hurt.

has someone been crying on it ?

doctor told them it would take 6 months to heel but he never examined it in any way

who did he tell,your friends shoulders :^0

Remove the large chip, pain should subside.

do you mean 1 muscle not working - in which case it shouldn't take 6 months! or 1 shoulder not working? if it's a frozen shoulder then 6 months is optimistic.

The supraspinatus is the most problematic muscle where the shoulder joins the arm. Tell him to stop masturbating quite so vigorously.

yes 1 muscle ot working

there are 7 muscles directly connected to shoulder strength & mobility(4 active & 3 held in reserve)
your friend simply has to disengage the faulty muscle & engage any 1 of the 3 backups