A Biomechanical Study of Calcaneal Tuberosity Avulsion Fracture: A Comparison Between Three-Screw Versus Two-Screw Fixation Strength.

A calcaneal tuberosity avulsion fracture constitutes a sub-group of calcaneal fractures and it poses a high risk of soft tissue compromise, necessitating urgent reduction and fixation. This fracture was commonly treated with screw fixation, and fixation failure associated with this method has been reported in the literature. In light of this, we tested and compared the strength of two-screw (2S) versus three-screw (3S) fixations, where the third screw was fixed from the posterior calcaneal tuberosity towards the anterior process in addition to the two parallel screws.

Comparing the mechanical strength of hip spica cast between a conventional and a new method of application.

Purpose: The current technique of hip spica application is mostly based on a publication by Kumar (J Pediatr Orthop 1(1):97-99, 1981). We modified the technique of hip spica application in order to reduce the rate of breakage across the hip joint and designed this study to compare the strength between hip spica applied according to Kumar's technique and the new technique.

Methods: We created 12 hip spica casts with 24 hips according to Kumar's technique, and another 12 casts according to a new technique.