Publications by authors named "Jason K Otto"
Article Synopsis
- This study explores the effectiveness of robot-assisted multi-compartmental knee arthroplasties in maintaining near-normal knee mechanics in patients with arthritis, focusing on retaining undamaged compartments while addressing the diseased ones.
- Thirteen patients underwent various types of unicompartmental and bicondylar knee arthroplasties, and their knee movements were analyzed using video-fluoroscopy an average of 13 months after surgery, revealing specific patterns during activities like stair climbing and kneeling.
- Results indicated that knees with uni- or bi-compartmental implants had stable kinematics, resembling healthy, functioning knees, which suggests that this approach may effectively preserve knee mechanics post-surgery.
Article Synopsis
- The study aimed to investigate dynamic contact stress changes and kinematic instability in posterior malleolar ankle fractures, contrasting static loading studies.
- The research involved testing seven fresh cadaver specimens in a biomechanics lab, simulating different fracture scenarios while monitoring ankle movement and contact stresses during motion.
- Findings showed no signs of joint instability or increased peak contact stress compared to unfractured ankles, but there was a noteworthy shift in stress distribution towards areas that typically experience less load, suggesting these areas might experience increased wear post-fracture.
Gait cycle finite element comparison of rotating-platform total knee designs.
Clin Orthop Relat Res
May 2003
Functional load transmission and kinematic performance were compared for standard versus posterior-stabilized versions of a rotating-platform total knee implant, over a standardized loading cycle, using three-dimensional contact finite element analysis. These two design variants differ primarily in terms of the latter's polyethylene insert having a cam that engages with the femoral component during appreciable flexion, thereby inducing femoral component rollback. The finite element model, previously validated experimentally, afforded direct comparisons of anterior lift-off of the insert from the tibial tray, of bearing mobility (insert rotation about the pivot post), of femoral rollback, and of metal-on-polyethylene contact stresses at the bearing and backside surfaces of the insert.
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