Comparison of different distal radius dorsal and volar fracture fixation plates: a biomechanical study.
OBJECTIVE
To compare the biomechanical properties of 6 dorsal and volar fracture fixation plate designs in a cadaver model.


METHODS
Six different plating techniques were used on surgically simulated, unstable, extra-articular distal radius fractures in fresh-frozen cadavers. Specimens were tested to failure in axial compression with the Materials Testing System machine, and were analyzed with a motion analysis system. The 6 different fixation systems studied included an AO stainless steel Pi plate (group 1), an AO titanium Pi plate (group 2), a Forte plate (group 3), a dorsally placed Symmetry plate (group 4), a volarly placed Symmetry plate (group 5), and a volarly placed SCS/V plate (group 6).


RESULTS
All dorsal plates (groups 1, 2, 3, 4) failed in apex dorsal angulation and all volar plates (groups 5, 6) failed in apex volar angulation. No group developed an average angular deformity greater than 5 degrees with a load of 100 N, which compares with the physiologic loads expected with active wrist motion. Only the volarly placed SCS/V plated specimens (group 6) resisted deformation of 5 degrees or more at loads up to 250 N, which compares with the physiologic loads expected with active finger motion, and was significantly stronger and more rigid than the other 5 plate groups.


CONCLUSIONS
The SCS/V plate fixation system is the most rigid of the systems tested and may offer adequate stability for the treatment of the distal radius fracture in which the anterior and/or posterior metaphyseal cortex is comminuted severely.
Osada
Denju
D
Division of Research, Department of Orthopaedic Surgery and Rehabilitation, University of Texas Medical Branch, Galveston, TX 77555, USA.
Viegas
Steven F
SF
Shah
Munir A
MA
Morris
Randal P
RP
Patterson
Rita M
RM
D000293:Adolescent; D000328:Adult; D000368:Aged; D001696:Biomechanical Phenomena; D001860:Bone Plates; D004867:Equipment Design; D005260:Female; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D018460:Fractures, Comminuted / Q000503:physiopathology / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011885:Radius Fractures / Q000503:physiopathology / Q000601:surgery*; D016059:Range of Motion, Articular; D014955:Wrist Joint / Q000503:physiopathology