Watercolour medical illustration depicting disease in the knee joint. It has the alternative reference number 1750, P19A and 261 on the front. There is no Richmond Hospital Museum reference. The handwritten note on the back reads 'This drawing represents a number of vascular fimbriated productions from the synovial membrane of the knee. The external semilunar cartilage is [?] in form & larger than natural. History of case unknown'.