My oldest gymmie has HMS and also suspected EDS, her ankles, wrists (new pain area) and hips are most effected, her ankles can give way on her several times a day if she walks too far (we have now been given a wheel chair for when things get too much pain wise), she has just finished a course of physio and has a referral to the feet specialist, she doesn't get pain in her hips at the moment which s a good thing.
My daughter has been getting increasing problems in her right wrist which takes days to become pain free again, it is a bit of a bark as she is right handed, she has low muscle tone and despite being in gymnastics for three years cannot do a full pull up yet, getting close though. My daughter is now 12 and I cannot see her being able to continue with the side if the sport she does and are seriously thinking of going back to rec gymnastics once a week for fitness reasons if she keeps getting problems, her physio also recommended trampolining which she loves, she currently goes for half hour a week and makes sure her ankles are well supported, this is at a recreational level and is doesn't matter if she has time off here and there.
We are going for a referral to a joint specialist, she already has an OT