A Biomechanical Comparison of Four Fixation Methods of First Metatarsophalangeal Joint Arthrodesis

Abstract

A simulated metatarsophalangeal joint arthrodesis was performed on 18 pairs of cadaveric great toes. One toe of each pair was fixed with a 4.0-mm oblique AO cancellous screw. The contralateral toe was fixed with one of three techniques: (1) a miniplate placed dorsally; (2) a 4.5-mm Herbert cannulated screw placed from the metatarsal neck into the medullary canal of the proximal phalanx; or (3) a 3/32-inch Steinmann pin placed longitudinally. An oblique 0.045 Kirschner wire was added with each method. The specimens were tested to failure in dorsiflexion. The mini-plate was significantly stronger than the AO screw in force to failure and initial stiffness. The Herbert cannulated screw was also significantly stronger in force to failure than the AO screw. There was no significant strength difference between the Steinmann pin and the AO screw.