Peter A. Gustafson

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A paucity of published data is available describing the methods for the integration of 3-dimensional (3D) printing technology and surgical simulation into orthopedic surgery. The cost of this technology has decreased and the ease of use has increased, making routine use of 3D printed models and surgical simulation for difficult orthopedic problems a(More)
BACKGROUND Clavicle malunion affects the biomechanics of the shoulder joint. The purpose of this study is to establish the abduction, flexion, and internal (medial) rotation biomechanics of the shoulder after clavicle malunion. METHODS A computational study was performed utilizing a three-dimensional, validated computational model of the upper extremity.(More)
BACKGROUND The position, axis, and control of each lower extremity joint intimately affect adjacent joint function as well as whole-limb performance. A review of the literature finds little describing the biomechanics of subtalar arthrodesis and the effect on ankle biomechanics. The purpose of the current study was to establish this effect on sagittal plane(More)
OBJECTIVES The ability of surgeons to optimize screw insertion torque in nonlocking fixation constructs is important for stability, particularly in osteoporotic and cancellous bone. This study evaluated screw torque applied by surgeons during synthetic cancellous fixation. It evaluated the frequency with which screws were stripped by surgeons, factors(More)
OBJECTIVES The objective of this study is to evaluate whether real-time torque feedback may reduce the occurrence of stripping when inserting nonlocking screws through fracture plates into synthetic cancellous bone. METHODS Five attending orthopaedic surgeons and 5 senior level orthopaedic residents inserted 8 screws in each phase. In phase I, screws were(More)
The subtalar joint is important for gait and function of the foot and ankle. With few external landmarks, the joint is difficult to conceptualize and study in vivo. There have been several functional representations put forth in the literature which can be combined to give a broader understanding of the overall function and mechanics of the subtalar joint.(More)
0020-7683/$ see front matter 2008 Elsevier Ltd. A doi:10.1016/j.ijsolstr.2008.11.016 Abbreviations: ASTM, ASTM International; CC, co continuous cohesive zone method; CPE4I, bilinear inc elements; DACE, design and analysis of computer cantilever beam; DCZM, discrete cohesive zone metho finite element; LEFM, linear elastic fracture mech sampling; SLJ, single(More)
A discrete cohesive zone method finite element is used to evaluate traction law efficiency and robustness in predicting decohesion in a finite element model. Three traction laws are reported and are compared from the perspective of their computational efficiency and robustness. The smooth traction laws (based on the beta distribution and sine functions) are(More)
An experimental program to determine the mode I critical energy release rate (GIc) of the T650/AFR-PE-4/FM680-1 material system is reported. Two forms of GIc are determined over the range of 20 to 350 ◦C, the area method critical energy release rate GIc and the inverse method critical energy release rate (GIc). The value of GIc was found to increase with(More)
A thermo-mechanical analytical model and a corresponding macroscopic bonded joint finite element is presented for the analysis of orthotropic double lap joints subjected to combined thermal-mechanical loads. The analytical solution offers an improvement in accuracy over its predecessor, at the cost of increased solution complexity. However, to facilitate(More)