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FUNCTIONAL BIOMECHANICAL EVALUATION OF MULTIPLE DESIGN PROGRESSIONS OF DISTAL RADIUS VOLAR PLATES

Addula, Venkateshwar Reddy
http://rave.ohiolink.edu/etdc/view?acc_num=akron1196715761

Abstract Details

2007, Master of Science in Engineering, University of Akron, Biomedical Engineering.
Distal radius fractures are among the most common fractures of human skeleton. These fractures constitute up to 15 % of all extremity fractures. Restoration of the anatomy of the distal radius and ulna is very crucial in achieving and maintaining the normal wrist function. Volar plate fixation with locking screws has become increasingly popular among surgeons for the treatment of unstable distal radius fractures. The purpose of the present study was to evaluate the biomechanical performance of different design progressions of the volar plating systems and to compare the relative biomechanical stability of three commonly used distal radius volar plates, under loading conditions simulating the physiologic forces that are experienced during early active rehabilitation. A total of 15 synthetic radius bones were used for evaluation of the implants with a material testing machine. A one centimeter metaphyseal defect was created at a distance of 2cm from the radial styloid. The fracture fixation stability of three volar plates (Kmi Viper Distal Radius Plate, Hand Innovations 1st generation DVR plate, Hand Innovations 2nd generation DVR plate) was compared. Force orientation was axial compression in the following three clinically significant directions; axial, dorsal 30° and volar 30°. Forces simulating those generated during the early active motion of the wrist and digits were applied. The structural stiffness of the construct, stiffness across the created fracture gap and fracture gap micro motion of all the constructs were measured and compared to assess the relative stability of three implants. In the present study, we found that volar fixed angle plates with fixed angle distal screws provided the greatest construct stiffness, gap stiffness and least micro motion in most of the loading cases. Therefore, the plates with fixed angle locking distal screws appear to reduce fracture gap micro motion compared to volar plates with variable angle locking distal screws. However, surgeons may find the volar plates with variable angle locking screws to be useful in the treatment of certain complex fractures, as these plates allow them to orient the screws in different angles for achieving better anatomic reduction of distal radius articulating surface. The present study provides comparative biomechanical data that may be useful in individualizing plate fixation techniques and postoperative rehabilitation protocol for the treatment of unstable distal radius fractures. Volar plates with fixed angle locking screws allowed significantly less fracture gap motion than volar plates with variable angle locking screws, suggesting that rigid plate fixation through Hand Innovations 2nd generation DVR plate may allow for early assisted finger and wrist motion in the treatment of unstable distal radius fractures.
Glen Njus (Advisor)
67 p.
Engineering, Biomedical
biomechanics; volar plates; distal radius fractures; distal radius volar plates; biomechanical evaluation of distal radius plate; Fixed angle volar plates; Variable angle locking screws; Handinnovations; Kmi; unstable distal radius fractures.

Recommended Citations

Citations

  • Addula, V. R. (2007). FUNCTIONAL BIOMECHANICAL EVALUATION OF MULTIPLE DESIGN PROGRESSIONS OF DISTAL RADIUS VOLAR PLATES [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1196715761

    APA Style (7th edition)

  • Addula, Venkateshwar. FUNCTIONAL BIOMECHANICAL EVALUATION OF MULTIPLE DESIGN PROGRESSIONS OF DISTAL RADIUS VOLAR PLATES. 2007. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1196715761.

    MLA Style (8th edition)

  • Addula, Venkateshwar. "FUNCTIONAL BIOMECHANICAL EVALUATION OF MULTIPLE DESIGN PROGRESSIONS OF DISTAL RADIUS VOLAR PLATES." Master's thesis, University of Akron, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1196715761

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.