Biomechanical influences of pin placement and elbow angle on hinge alignment and joint distraction of bridged elbow-pin-fixator construct

Journal of Biomechanics
Kao-Shang ShihSheng-Mou Hou

Abstract

Joint distraction and mobilization with a hinged external fixator preserves elbow stability and mobility. However, the alignment of both elbow and fixator hinges was the initial prerequisite of the arthrodiatasis technique. The main goal of this study was to numerically evaluate the kinematic influence of the device, surgery, and joint factors on hinge alignment. The kinetic effects of the pins placement and elbow angle on concentric distraction and mobilization were also discussed. A unilaterally hinged elbow-fixator system with a 14 links and 10 degrees-of-freedom was instrumented into a humeroulnar model. The Denavit-Hartenberg method with the homogeneous transformation matrixes was applied to perform kinematic analysis of the linkage system. The predicted results revealed that the concurrence of hinge alignment (i.e., kinematic) and concentric distraction (i.e., kinetic) necessitates two telescopic tubes orthogonal to the elbow hinge. The degrees-of-freedom arrangement of the fixator articulators plays a significant role in hinge alignment. After joint distraction, two hinges might be misaligned due to the difference in the structural rigidity of the pins, fixator, and stiffened elbow. Furthermore, those two prerequisite ar...Continue Reading

References

Jan 12, 2000·Journal of Orthopaedic Trauma·S M MadeyT D Brown
Feb 7, 2001·The Journal of Bone and Joint Surgery. British Volume·S L Cheng, B F Morrey
May 18, 2000·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·M BottlangT D Brown
Jun 10, 2003·The Journal of Bone and Joint Surgery. British Volume·A EricsonA Lundberg
Jan 18, 2006·Journal of Shoulder and Elbow Surgery·T C KoslowskyD Pennig

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Citations

Dec 13, 2016·European Journal of Orthopaedic Surgery & Traumatology : Orthopédie Traumatologie·Alexandre Dos SantosMarc Soubeyrand
Nov 20, 2012·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Wei-Shiun LeeChang-Yuan Fan

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