Sir, Injury to the fingertip or toe often results in a subungual haematoma. Some of these patients, and we do not know the exact proportion, wil have sustained a fracture of the terminal phalanx. If the haematoma is painful, the usual treatment is to trephine the nail.' Presumably this converts a closed fracture (if present) to a compound one. This being the case, it seems possible that trephin...