What are the treatment options for a dislocated shoulder that has been left untreated for years?

I’m sorry to hear about your pain. For an active sportsman, that certainly can be quite distressing. I don’t think you have dislocated as that will really really be painful and will be hard to walk. But popping sounds can be a sign of other illnesses, perhaps you might want to see a doctor to get it properly diagnosed, there are some “childhood” diseases that can predispose patients to hip injuries.

Tendinopathy can be challenging to treat but the mainstay of treatment remains rehabilitation with physiotherapists and load management. In situations where this is not helping, then you might be offered Extracorporeal Shock Wave Therapy (ESWT) to help stimulate the tendon to heal itself, or in situations where tearing is noted within the substance, a Platelet-rich plasma (PRP) injection could be considered. Other injection treatments include prolotherapy or high volume tendon stripping. However, all injections, care must be taken to offload the tendon afterward.