Realtively new Lead Trad Climber, first time climbing on Gritstone, struggled at the crux traverse / long reach. Had a couple of goes, sat on the gear (which held), then went for it - during which a cam worked itself free (must have walked out). Climber realised and started to downclimb as was not happy to continue, then fell off on nut believed to be good as previously weighted but which ripped - next gear was too low to prevent a ground fall from about 7 meters. Landed badly, Mountain Rescue called and stretchered to hospital where surgery was required for broken bones.