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      Biomechanical comparison of different pin configurations during percutaneous pinning for the treatment of proximal humeral fractures.

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          Abstract

          We investigate the influence on fracture stability of different pin configurations during percutaneous pinning for the treatment of proximal humeral fractures. We performed a matched-paired study of 18 pairs of adult fresh-frozen humeri (36 humeri), which were divided into 4 groups. A 2-part surgical neck fracture model was used in all humeri, and 4 terminal threaded pins (2.5 mm in diameter) were used for fixation. Parallel-type pinning (box type) was carried out in 2 groups, and convergent-type pinning (fan-shaped type) was used in the other 2 groups. For each specimen, both anti-shear ultimate load and anti-torsion ultimate load were measured. There was no statistical difference between the parallel pin construct and convergent construct with regard to anti-shear resistance (P = .73). However, the parallel pin construct had a significant advantage over the convergent construct regarding anti-torsion resistance. The parallel pin construct has better torsional stability when 1 cm is used for the pin-to-pin distance. We suggest that parallel pin fixation should be applied whenever possible.

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          Author and article information

          Journal
          J Shoulder Elbow Surg
          Journal of shoulder and elbow surgery
          1532-6500
          1058-2746
          : 16
          : 2
          Affiliations
          [1 ] School of Medicine, Peking University, Beijing, China. chunyanj@hotmail.com
          Article
          S1058-2746(06)00259-X
          10.1016/j.jse.2006.05.011
          17275352
          5a03caae-f075-4a34-91a0-7e74aad68d21
          History

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