The upper arm bone in the front leg is called the humerus. This bone has an unusual shape and fractures are more difficult to repair than the other bones in the legs. If the centre of the bone breaks we typically repair the fracture using a contoured plate and screws made of stainless steel. These implants are stiff and function to hold the two bone segments rigidly while the bone heals back to normal strength. Sometimes, if there are many large fragments, we place wire around the outside of the bone first and then insert a large smooth pin down the inside of the canal (interlocking nail). Smaller breeds can develop a joint fracture after being dropped by children, we call this a humeral condyle fracture. The ideal reair for this one uses a compression screw and pin as shown in the sketch. Again, due to the irregular surfaces of this bone, it is very important to have an experienced vet perform this surgery.