Do loose joints always require surgery? what causes loose joints and what are some treatment options to strengthen it back

Loose joints R due 2: lax ligaments. It usually a form of milder Marfan's. Nothing can B done to tighten the ligaments. I am aware of a girl who had grade I Marfan's & had an ACL reconstruction using her hamstring tendons. It failed because her own diseased tissue was used & it stretched out. Had it redone with cadaver bone-tendon-bone grafting using patellar tendon and not being diseased, did well.