Table 1.

Breakdown of the scoring system used to assess each intervention

1	2	3
Ultrasound visibility
Poor ultrasound visibility (essential structures can be recognized, but no exact borders delineated)	Average ultrasound visibility (essential structures can be recognized, exact borders can be delineated in most cases)	Good ultrasound visibility (essential structures can be recognized and exact borders delineated)
Outcome
Unsuccessful transection of the A1-pulley (less than three quarters of the ligament)	Partial transection of the A1-pulley (more than three quarters of the ligament)	Complete transection of the A1 pulley
Safety
Injury to vessels, nerves or the A2-pulley, flexor tendon lacerations	Slight traces on underlying flexor tendons	No injury to adjacent structures