Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (42): 7843-7846.doi: 10.3969/j.issn.1673-8225.2010.42.037

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Axial stability of lateral-hole dynamic hip screw fixation using type Ⅲ polymethylmethacrylate bone cement argumentation

王红兵1，徐瑞生2，王雪松2，吴洁石2，薛  骏2，袁凤来2   

  1. 1 Jiangyin Wenlin Hospital, Jiangyin   214100, Jiangsu Province, China;    2 The Third People’s Hospital of Wuxi, Wuxi   214041, Jiangsu Province, China
  • Online:2010-10-15 Published:2010-10-15
  • Contact: Xu Rui-sheng, Doctor, Chief physician, The Third People’s Hospital of Wuxi, Wuxi 214041, Jiangsu Province, China xuruisheng@medmail.com.cn
  • About author:Wang Hong-bing, Attending physician, Jiangyin Wenlin Hospital, Jiangyin 214100, Jiangsu Province, China wanghb-zhu@hotmail.com
  • Supported by:

    Youth Project by the National Natural Science Foundation of China, No. 30901526*

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Abstract:

BACKGROUND: Dynamic hip screw (DHS) is the commonest instrument for treatment of osteoporosis intertrochanteric fracture in aged patients, but the fixation is strongly impacted by osteoporosis, leading to a higher failure.
OBJECTIVE: To study the fixation effect of a lateral-hole DHS together with bone cement argumentation by biomechanical test.
METHODS: Lateral-hole DHS were designed by drilling four lateral holes in the thread part of the screw. Bone cement was injected into femoral cancellous bone via DHS “central hole-lateral hole”. Biomechanical study with axial loading was performed in six matched pairs of fresh frozen human cadaver femurs, unstable intertrochanteric fracture models were produced, then each paired model was randomly distributed to lateral-hole DHS fixation together with bone cement argumentation and standard DHS fixation group. Biomechanical study of “load-strain” and “load-displacement” test, anti-torsion and pull-out strength were performed.
RESULTS AND CONCLUSION: There was no statistical difference of biomechanical strength between lateral-hole DHS fixation together with bone cement argumentation group and standard DHS fixation group; axial loading “load-strain” test showed the strain at the tension side in the bone cement argumentation group was significantly less than that in standard DHS fixation group (t=2.795, P < 0.05). The same result was seen in the pressure side (t=2.621, P < 0.05). When axial loading increased to 600 N, vertical displacement decreased by 31% and horizontal displacement decreased by 29% in bone cement argumentation group as compared with standard DHS fixation group, with significant difference (P < 0.05). The augmentation technique of injecting bone cement to femoral head through central channel and lateral holes of DHS can significantly increase biomechanical strength of DHS fixation for intertrochanteric fracture.

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