I injured my knee skiing last year and it seemed to have healed until I went trampolining when it collapsed sideways and inwards. Now I can’t trust it at all and it could giveway at any given moment. Now I am unable to kneel as it feels like the ligament on the inside gets caught on something and when I try to stand up it pops off, this is painful and the more often it happens the sorer my knee becomes. I am English and as yet don’t have health insurance. Any answers as to how I could treat it myself and if not what do I need to do and roughly how much will it cost. Help this just seems to be getting more and more painful!