Biomechanical comparison of two implants for the stabilization of incomplete ossification of the humeral condyle lesions in dogs

Abstract

Objective: To compare biomechanical properties of (1) 4.5mm cortical screws and Fitz Fenestrated Tubular Transcondylar (F2T2) screws; (2) normal humeri and humeri with an intracondylar osteotomy; and (3) humeri with an intracondylar osteotomy stabilized with either a 4.5mm cortical screw or a F2T2 screw. Study Design: Cadaveric biomechanical assessment. Sample Population: 4.5mm cortical screws (n=10), 5.85mm F2T2 screws (n=10), and paired dog humeri (n=40). Methods: Cortical and F2T2 screws were loaded to failure in 3-point bending. Ten pairs of humeri with or without an intracondylar osteotomy were axially loaded to failure. Ten additional pairs of humeri with an intracondylar osteotomy were alternately stabilized with a positional cortical or F2T2 screw and axially loaded to failure. Results: Mean stiffness, yield load, and failure load was significantly greater (P