gout and other medical problems known in middle ages, some slowed down knights lasted by being smart, other died. Literature of the time, reports from Crusades had lists of injured, not fit for combat and the elder knights about 30 to 50 years old had various problems. some of documents, letters and copies in British Museums, some in France., Germany and some in Istanbul archives Arthritis and trauma induced crippling of hands, some feet, knees noted for some of troops and knight officers, light duties for some, others regular action. death rate in hospital wasn't good- 75% death from some belly wounds common, amputations 30% for spear, sword slash infections. Medical knowledge and practice of Roman legion times went down after collapse of Roman Empire, Spain in 1500s declined as well after expulsion of Moors and Jews , but some of reports indicated cause of death implications of bacterial infection, gangreen that had previously been treated by Jews and Moors with soured wine of old Roman medics- washing to disinfect replaced by prayer didn't work as good as Pagan witches brews, muslim treatments with Jewish practice of bandages, wine wash. Arthritis treatment with warmed wool , willow bark teas and bit of poppy juice elixer. you want to get fancy with sword and have some pains? try different hold, wrist wraps and consider 2 handed battle axe/halberd instead of rapier. .