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Sheena S. Philip, Joy C. Macdermid, Saranya Nair, Dave Walton and Ruby Grewal

Distal radius fracture (DRF) is a common, debilitating injury of the upper extremity with a crude incidence of 175.5/100,000 persons in the United States ( Orces & Martinez, 2010 ). The number of older adults (>50 years) who received treatment for forearm and hand fractures increased by 15.2% in U

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Katie Crockett, Saija A. Kontulainen, Jonathan P. Farthing, Philip D. Chilibeck, Brenna Bath, Adam D.G. Baxter-Jones and Catherine M. Arnold

Distal radius fractures (DRF) are the most common fractures in women over the age of 50 years ( Edwards et al., 2006 ; Handol, Madhok, & Howe, 2006 ; Mulhall, Ahmed, Khan, & Masterson, 2002 ), with the incidence increasing from 9% at age 50–59 to 38% after age 80 ( Barrett-Conner, Weiss, McHorney

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Alexander Synek, Yan Chevalier, Christian Schröder, Dieter H. Pahr and Sebastian F. Baumbach

The variety of experimental setups used during in vitro testing of distal radius fracture treatments impairs interstudy comparison and might lead to contradictory results. Setups particularly differ with respect to their boundary conditions, but the influence on the experimental outcome is unknown. The aim of this biomechanical study was to investigate the effects of 2 common boundary conditions on the biomechanical properties of an extra-articular distal radius fracture treated using volar plate osteosynthesis. Uniaxial compression tests were performed on 10 synthetic radii that were randomized into a proximally constrained group (ProxConst) or proximally movable group (ProxMove). The load was applied distally through a ball joint to enable distal fragment rotation. A significantly larger (ProxConst vs ProxMove) stiffness (671.6 ± 118.9 N·mm−1 vs 259.6 ± 49.4 N·mm−1), elastic limit (186.2 ± 24.4 N vs 75.4 ± 20.2 N), and failure load (504.9 ± 142.5 N vs 200.7 ± 49.0 N) were found for the ProxConst group. The residual tilt did not differ significantly between the 2 groups. We concluded that the boundary conditions have a profound impact on the experimental outcome and should be considered more carefully in both study design and interstudy comparison.

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Woochol J. Choi, Harjinder Kaur and Stephen N. Robinovitch

Distal radius fractures are common on playgrounds. Yet current guidelines for the selection of playground surface materials are based only on protection against fall-related head injuries. We conducted “torso release” experiments to determine how common playground surface materials affect impact force applied to the hand during upper limb fall arrests. Trials were acquired for falls onto a rigid surface, and onto five common playground surface materials: engineered wood fiber, gravel, mulch, rubber tile, and sand. Measures were acquired for arm angles of 20 and 40 degrees from the vertical. Playground surface materials influenced the peak resultant and vertical force (P < .001), but not the peak horizontal force (P = .159). When compared with the rigid condition, peak resultant force was reduced 17% by sand (from 1039 to 864 N), 16% by gravel, 7% by mulch, 5% by engineered wood fiber, and 2% by rubber tile. The best performing surface provided only a 17% reduction in peak resultant force. These results help to explain the lack of convincing evidence from clinical studies on the effectiveness of playground surface materials in preventing distal radius fractures during playground falls, and highlight the need to develop playground surface materials that provide improved protection against these injuries.

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Mohamed Abdelmegeed, Everett Lohman, Noha Daher, June Kume and Hasan M. Syed

and hand, concomitant distal radius fractures, radial-sided wrist pain, and surgery(ies) of the affected upper-extremity within the past 6 months. In total, 30 subjects met the inclusion criteria, but 2 subjects were lost to follow-up. We analyzed the data based on the remaining 28 eligible

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Garrett M. Hester, Zachary K. Pope, Mitchel A. Magrini, Ryan J. Colquhoun, Alejandra Barrera-Curiel, Carlos A. Estrada, Alex A. Olmos and Jason M. DeFreitas

. , Krentz , J.R. , & Farthing , J.P. ( 2013 ). Cross-education for improving strength and mobility after distal radius fractures: A randomized controlled trial . Archives of Physical Medicine and Rehabilitation, 94 ( 7 ), 1247 – 1255 . PubMed ID: 23529145 doi:10.1016/j.apmr.2013.03.005 10.1016/j