Just an addenda to this old thread.
As someone who has had major shoulder surgery in the past, and still sails with bad shoulders 20 years later, I hope the following practical, cheap observations can help someone.
Before my practical advices:
- rest: this has never helped me, but it's probably because I was a lost cause to start with, damage-wise (at least 3 O-Ss told me so). However still recommended to others, it falls in the category of "it can't hurt". The items below apply only once you've rested until no pain, and that you have a strong feeling that you're getting better.
- don't take anyone's advice, including mine

: the shoulder, like the back, seems to be an incredibly complex set of joints - everyone's pathology seems to be different. Certainly one single individual can't apply his-her own experience to someone else. Of course the right doctors can apply 100-1000 cases to generalise for a specific case.
Practical advices:
- ice, ice, ice soon after the outing. I do not know that there is a down-side when this is well-applied, but it really seems to work all the time. Work as in "don't hurt", "feels better", "seems to help in the medium run", "I can sail longer for the same level of pain". Of course as with any treatment, one can never formally prove that it works, but after 20+ years, there is a very strong correlation.
Basically, it works wonders here. I had a couple of comps where in fact I was freezing myself before just in order not to feel myself for the duration of the routine. This has got to be wrong though, don't do it. (I have a comp in a month, and I'll do it again, times 2-3-4 routines

)
- the grip: changing the grip often helps, and I believe it can't possibly hurt just to try. Basically there are 8 different grips, right? (up-down front-rear hand, left & right). I mix them a lot, never stay for a long time with the same grip on a same tack. Of course some boom types lend themselves better to the front-hand underhand grip. Just switch 1-2 minutes makes a diff. I actually do the Codman exercises whilst sailing, and I find it helps too.
- boom height: boom height really makes a big diff here. Obviously it changes drastically the angles at the shoulder joints - how I don't know, me not a doctor nor a quack. For non-planing freestyle or small-Goya freestyle (fooling around), low booms !! Anyways look at some of the pros on the circuit, booms are often low indeed.
- variety: I find cruising for 3 hours on a tack before gibing makes me prone to soreness, even when fully hooked in and reading a book. Probably a case of repetitive strain or something like that. I hurt less with frequent transitions, they seem to change the hurt around, or something like that. As I said, me no doctor. Can't hurt to try short tacks for a couple of outings just to see if there's a diff, right?
- variety: I find freestyling my 95L in 20-25 knots hurts much less than racing around or simply cruising in strong winds. Probably because the joints move around. Of course I break or bruise all of the other bones in the process, but that's a different topic...
- use the front-to-back (pushing the sail) a lot, often: this rests the entire shoulders set, with the bonus that it allows you to use the opposite set of muscles (pushing instead of pulling, triceps, abs instead of dorsals, etc.). This applies to most types of sailing - freestyle, cruising 90-95+ liters, and non-planing. In strong winds this is an excellent exercise. I was at a freestyle jam last year in a 20-25 knot wind, and basically we all spent about one-third our sailing time pushing, in various formats.
- keeping in shape: there are long lulls here, and you have some in NSW too (Canberra!). In the 10-15 knot range, I go out on a larger board and I fool around, with no harness. I find this keeps the muscles in shape for when the wind picks up. The non-doctor of me reckons it's no good to be out for a month as a wind-snob, and then go out for 2 hours in a 25 knotter with borderline shoulders.
Hope any or all of these help a bit,
'luck,
PC45.