Mathematical modeling of glenoid bone loss demonstrate differences in calculations that May affect surgical decision making.

Objective: Two glenoid bone loss calculations are compared across a range of anatomic glenoid sizes.

Methods: 20 cadaveric paired glenoid diameters were measured to create glenoid models with bone loss calculated in 1 mm linear increments up to 50% bone loss comparing the linear measurement percentage (LMP) to the circle line method (CLM) gold standard.

Results: The LMP overestimates glenoid bone loss at every potential 1 mm increment across each glenoid model until bone loss reaches 50%.

The Effect of Instrumentation on Suture Tensile Strength and Knot Pullout Strength of Common Suture Materials.

Objective: To determine the effect of instrumentation of suture material on knot security and tensile strength.

Study Design: In all, 5 types of suture material were used; 10 knots were tied without any instrumentation and 10 knots were tied with a hemostat holding tension on the first throw while the second throw was made for each suture type. Each group was tested to failure with the maximum load and mode of failure recorded.