<s>[INST] About 5 months ago i broke my thumb play footy (AFL) and the bone came through my nail now it is all repaired but now it is very weak and sore when weight is put on it, whenever I bend my thumb it always seems to crack sometimes a small crack and sometimes a large sore crack. Do you have any ideas of what I could do preventing this reducing the crack? [/INST] Hi... The reason for the crack in your thumb is bone on bone friction and rubbing due to muscle imbalance around the joint... So I suggest you to Reduce tightness in the forearm and their muscles by stretching them frequently... Apply a lot of ice to reduce soreness and inflammation caused due to excessive compressive forces placed in the joint due to imbalance.  Strengthen your forearm muscles ... Strengthening your trip and thumb extension will help you to recover faster...Don't keep checking the pain and pooping sensation... Hope this is helpful for you... Kindly revert in case you need any further help in this regard . </s>