Hi & welcome. It's good to hear the screws were inserted due to a medical procedure rather than a random act of wanton recklessness That said, ultimately the final decision with regard medical suitability for service in the Royal Marines will revolve around the specific reason for the stabilisation - presumably due to repeat dislocations? If so it will depend on the specific history and the implications of the surgical procedure with regard mobility & future potential for the requirement for further treatment arising during the rigours of Royal Rarines Recruit Training (RT). In short - providing you are fully able to undertake all elements of arguably the most physically demanding combat infantry training in NATO: Without hinderance or limitation No more likely than any other potential recruit to suffer repeat recurrance of the injury requiring surgery Not likelly to be initiating litigation for incurring injuries related to the known, declared pre-existing problem by retrospectively claiming you were negilgently permitted to join Are at least twelve months clear of surgery The nuts & bolts do not need removing...then you maybe in with a chance. Otherwise: You're having a giraffe. Best of luck.