The SHRI-CORE Biomechanics Lab focuses on testing various orthopedic devices and implants. The purpose of this biomechanics research is to improve surgical planning and patient outcomes by comparing different surgical approaches and fixation techniques. The lab houses two servo-hydraulic mechanical testing frames for conducting cadaveric bone tests: an axial-only frame and an axial-torsional frame (Shore Western Manufacturing, Inc). These frames can load the samples in tension, compression, or torsion to evaluate many mechanical properties of orthopedic implants and fixation techniques through simulation of real-life movements and stresses. An Optotrak Certus (Northern Digital Inc) motion capture system can be used in conjunction with the test frames to quickly and accurately monitor the complex movements and deformations of specimens under load during movement. Recent studies have focused on the fixation of the sacro-iliac joint after pelvic injury, tibial plateau and distal femur fractures, initial total hip arthroplasty stability, suture anchor fixation, and fixation of greater tuberosity fractures.
The SHRI-CORE Shoulder Controller is a device that simulates in vivo neuromuscular control of the shoulder. The device is driven by custom closed-loop control software that can place anatomic tensions on up to twelve muscle insertions to guide the humerus through lifelike movements. During movement it can simultaneously record humeral position, muscle loads, muscle excursions, and the component joint reaction forces. It was initially created to investigate the change in muscle loading after severe rotator cuff tears, but has since been modified to evaluate shoulder replacement prostheses and other pathologies. This device is currently undergoing development that will allow it to control other joints of the body with minor modifications.
The Biomechanics lab has developed a semi-constrained ‘dancing pelvis’ model for cadaveric pelvic testing. This system allows for the simulation of weight bearing loads during typical daily activities. As one of a handful of facilities in the United States that has this capability, it allows us to perform advanced testing on traumatic pelvic injuries as well as other biomechanics research.
Disclosure: Biomechanics research funding has been provided by the following orthopedic companies. Stryker, Depuy-Mitek, Arthrex, Exactech, Smith & Nephew, Orthopaedic Research and Educational Foundation