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首页> 外文期刊>Veterinary and Comparative Orthopaedics and Traumatology >A biomechanical comparison of unilateral and bilateral string-of-pearlsTM locking plates in a canine distal humeral metaphyseal gap model.
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A biomechanical comparison of unilateral and bilateral string-of-pearlsTM locking plates in a canine distal humeral metaphyseal gap model.

机译：犬肱骨远端干phy端间隙模型中单侧和双侧珍珠线 TM 锁定板的生物力学比较。

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摘要

Objective: To compare the in vitro biomechanical performance of two String-of-Pearls (SOP) plate constructs in a canine distal humeral metaphyseal gap model. Methods: Seven pairs of canine cadaveric humeri, including the elbow joints, were prepared. One group consisted of a unilateral medially placed SOP plate with bicortical screws (UNI). The second group consisted of bilateral caudo-medial and caudo-lateral SOP plates applied with monocortical screws (BI). A 2 cm ostectomy was performed immediately proximal to the supratrochlear foramen. Constructs were tested in torsion and axial compression. Results: The UNI constructs had significantly lower stiffness in torsion and axial compression than the BI group. However, UNI constructs had a significantly higher ultimate strength than BI constructs. All UNI constructs failed by bending of the transcondylar screw and SOP plate. All BI constructs failed by axial pullout of the distal most screws. Clinical significance: In stabilizing canine supracondylar humeral fractures as modeled here, both the UNI model and the BI model demonstrated biomechanical advantages. The incorporation of a transcondylar screw through the medial plate appears to be beneficial to construct strength.
机译：目的：在犬远端肱骨干meta端间隙模型中，比较两种珍珠串（SOP）板结构的体外生物力学性能。方法：准备7对犬的尸体肱骨，包括肘关节。一组由单侧内侧放置的SOP板和双皮质螺钉（UNI）组成。第二组由应用单皮质螺钉（BI）的双侧颅骨内侧和外侧颅骨SOP板组成。立即在上睑上孔的近端进行2 cm骨切除术。对结构进行了扭转和轴向压缩测试。结果：与BI组相比，UNI结构的扭转和轴向压缩刚度明显更低。但是，UNI构造的最终强度明显高于BI构造。所有UNI构造均因con突螺钉和SOP板弯曲而失效。所有BI构造都由于轴向拉远了大多数远端螺钉而失败。临床意义：在稳定此处所模拟的犬con上肱骨骨折中，UNI模型和BI模型均显示出生物力学优势。通过con骨板穿入plate突螺钉似乎有利于增强强度。

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