Are you sure that the ulnar collateral ligament at the metacarpal-phalangeal joint is still intact? No Stener lesion? If you can't answer yes to those questions, you might want to have it checked out, if you haven't already.
As for the workout...think of all the things you could do without your hands, Nautilus style upright flys, planks, tri's and bi's with resistance bands instead of weights...you can get creative and surprise yourself.
2011 Jet Black 135i Vert
2011 Diamond White GL450