Softened state of the cartilages and bones of the knee joint

Watercolour medical illustration depicting disease of the knee joint. It has the alternative reference number 1735 and P19A on the front. There is no Richmond Hospital Museum reference. The artist's name is in the bottom right corner 'J. Connolly Del.t' and in the bottom left 'Case of J.s Rooney Aet 15'. The handwritten note on the back reads 'This drawing is intended to show a softened state of the cartilages & bones of the knee joint. The knife penetrated deep into the [?] tissue with the utmost [?]'.