Biomechanical Analysis of Lateral Humeral Condyle Fracture Pinning

• DOI: 10.1097/bpo.0b013e3182074c5b
• Publication Date: 2011-03-30T07:57:37Z
• Authors: Tamir Bloom; Linda Y. Chen; Sanjeev Sabharwal
• Keywords: Biomechanics

Background The purpose of this study was to determine the optimum pin configuration and number pins needed stabilize Milch type II lateral humeral condyle fractures in a pediatric bone model. Methods Forty synthetic humeri were sectioned through distal humerus simulate fracture. Each fracture stabilized with 0.062-in K-wires 1 5 configurations: 2 convergent pins, parallel divergent 30-degree 60-degree 3 (n=8/group). Models tested extension, flexion, varus, valgus by applying translational force fragment at 0.5 mm/sec oscillating between N 50 for 10 cycles. For internal external rotation, constructs degree/sec ±1 Nm more than maximum torque values also recorded. bending loads, stiffness calculated mm displacement, whereas torsional degree degrees rotation. Data analyzed 1-way analysis variance 2-sample t test (P<0.05). Results Among 2-pin configurations, (60 degrees) provided statistically greater stability less loading, loading. Three had all configurations tended provide secure fixation varus Conclusions constructs, maximizing divergence site loading addition third orientation increases compared valgus, internal, rotation Clinical Relevance Bicortical placed spread maximizes fractures. If is questionable after are inserted, enhances stability.