A lateral x-ray of the finger can be helpful to exclude the presence of a fracture at the DIPJ. The avulsed tendon can become lodged close to the DIPJ, or in the finger, or in the palm. Identification of it’s location helps plan the extent of surgery.
In some patients the avulsed tendon will pull off a small fragment of bone, which can be seen on x-ray, helping to identify the position of the avulsed tendon.
If uncertainty persists an ultra-sound scan can help identify the position of the tendon end before surgery.