Woodstock shattered his ankle and tibia whilst chasing rabbits. The surgeon did a superb job and managed to save the leg but a lot of the cartilage in the joint was lost and there was a large chance that the bones wouldn't take.
The pins which go right through Woodstock's leg were left open, making the risk of infection high. If the leg didn't heal then fusing the leg was also an option and to an extent still is. Thankfully the bones have knitted back together and things are looking reasonably good, but even if he makes a full recovery the chances of him having arthritis problems are very high.
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