Comparison of biomechanics of common compression plate and locking plate fixation for middle and lower complex humeral shaft fracture in the elderly

doi:10.3969/j.issn.2095-4344.2016.26.017

Abstract

Abstract:

BACKGROUND: The lower and middle humeral shaft fractures are common upper limb fractures. Incidence rate and recurrence rate were high in the elderly population. However, there is a lack of a method with ideal curative effect.

OBJECTIVE: To compare and analyze the biomechanical differences between common compression plate and locking plate fixation in the repair of middle and lower complex humeral shaft fracture in the elderly.

METHODS: 30 pairs of antiseptic elderly humerus specimens were selected to make models of middle and lower humeral shaft fracture. Two humeri from the same individual were randomly assigned to two groups, and subjected to locking plate and common compression plate fixation. Experimental mechanics models were used to determine displacement and torsion angle under compression, bending and torsion. Data were analyzed and compared between the two groups.

RESULTS AND CONCLUSION: (1) After exclusion of relevant factors, specimens with high bone density and excellent quality were selected from all specimens. (2) Under axial load of 500 N, the bending load of 7.0 N•m and torsional load of 3 N•m or less, the strain was smaller in locking plate group than in common compression plate group under compression, bending and torsion (P < 0.05). Relative displacement under the above loading was smaller in locking plate group than in common compression plate group (P < 0.05). (3) Above data suggested that locking plate has good compressive, flexural and torsional rigidity, can ensure the stability and integrity of the fracture connection.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Humeral Fractures, Internal Fixators, Biomechanics, Tissue Engineering

CLC Number:

R318

Zhao Feng-feng. Comparison of biomechanics of common compression plate and locking plate fixation for middle and lower complex humeral shaft fracture in the elderly[J]. Chinese Journal of Tissue Engineering Research, 2016, 20(26): 3909-3915.

Figures/Tables 2

2.1 两组构件在不同载荷下的载荷-应变关系 2.1.1 压缩负载-应变关系 2组构件应变和负荷都成正相关关系，应变随负荷增加而增大，总体说来，锁定钢板组在每组压缩负载下，应变均小于普通加压钢板组，差异有显著性意义(P均< 0.05)，说明锁定钢板抗压性更强，见表1。 2.1.2 弯曲载荷-应变关系结果显示，2组钢板在弯曲负载下，负载越大，其应变也越大，呈线性关系；锁定钢板与普通加压钢板在同样大小的负载下，锁定钢板组应变均要小于普通加压钢板组，差异有显著性意义(P 均< 0.05)，说明锁定钢板有更好的抗弯曲性能，见表2。 2.1.3 扭矩-应变关系结果显示，生理条件负载下，2组钢板应变和负载大致上呈线性变化，锁定钢板组应变总体上较普通加压钢板组小，差异有显著性意义(P均< 0.05)，说明锁定钢板在扭转的条件下，也具有较好的抗形变性能，能为骨折断端的稳定性提供保障，见表3。 2.2 肱骨在不同负载下的负载-位移关系 2.2.1 压缩负载-位移关系 2组构件在不同负荷下的位移如表4所示，肱骨位移和负荷成正相关关系，位移随负荷增加而增大，总体说来，锁定钢板组肱骨在不同大小的压缩负载下，骨折断端位移均要小于普通加压钢板组，差异有显著性意义(P均< 0.05)，说明运用锁定钢板固定的骨折两断端在外力作用下，位移相对较小，总体稳定。 2.2.2 弯曲载荷-挠度关系结果显示，2组标本在弯曲负载下，负载越大，其挠度也越大，呈线性关系；所有标本在同样的负载下，锁定钢板组相对应的挠度均要小于普通加压钢板组，差异有显著性意义(P均< 0.05)，说明锁定钢板能为骨折提供更好的稳定性，见表5。 2.2.3 扭矩-扭角关系结果显示，生理条件负载下，扭矩-扭角关系在负载较小时，呈线性变化，在负载较大时，两者变化呈曲线关系，锁定钢板组扭矩总体上较普通加压钢板组小，差异有显著性意义(P均< 0.05)，说明锁定钢板在扭转的条件下，也具有较好的抗形变性能，能为骨折断端的稳定性提供保障，见表6。"

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