My tennis elbow from, hmm, about 1995 has never totally gone away. Swinging an axe which I do a fair bit for firewood in the winter is not good for it and sometimes if I carry a briefcase that is too heavy I can find that I feel it when playing guitar. There was one doctor in Harley Street who got the steroid injection just right every time but eventually even he said "no more steroid injections in that tendon". I had private insurance in those days.

Nowadays I just try to be nice to it and it's mostly OK - but I'm sure that if I tried to play tennis again my service would just kill it again - heavy topspin slice "indiarubber serve" - and I doubt I could redesign my serve after all these years.