Yep, the weights would definitely cause it ... watch out for your shoulders too. A buddy who started weights when she was well into her 50s (and was lifting serious weights - even doing comps) has had to have shoulder reconstruction. I don't think she is doing weights any more.
Did your EP know about your medical history & age? If 'yes' it is Surprising that they put you onto the biggish weights fairly quickly! ... Repetition of smaller weights would probably do the job just as well .... and hopefully not cause injuries!
take care & I hope it heals well xx