Lundy D W, Albert M J, Hutton W C
Department of Orthopaedic Surgery, Georgia Baptist Medical Center, Atlanta, USA.
J Orthop Trauma. 1998 Sep-Oct;12(7):496-503. doi: 10.1097/00005131-199809000-00013.
To determine the stiffness characteristics of the hybrid ring fixator in the treatment of (OTA 41-C) proximal metaphyseal and shaft tibial fractures.
Five identical composite tibiae were fixed with a Synthes, ACE Fischer, Howmedica Monticelli-Spinelli, or Smith & Nephew Trauma Ilizarov hybrid external fixator or with the conventional Ilizarov wire fixator. The Synthes and Monticelli-Spinelli fixators were tested twice, the first time with the connectors on the outside of the ring and the second time with the connectors on the inside of the ring.
A materials testing machine was used to apply pure compression, anterior and posterior bending, medial and lateral bending, and torsion. Stiffness values were calculated from the load deformation and torque angle curves.
Overall, the Synthes and Monticelli-Spinelli fixators were the most rigid of the fixators when the wire-to-ring connectors were placed inside the ring. In general, the fixators were stiffest in axial compression and least stiff in posterior bending. Wire length had a significant effect on overall stiffness.
This study suggests that the four hybrid external fixators in standard configuration have stiffness characteristics similar to those of the conventional Ilizarov fixator when used to treat proximal metaphyseal and shaft fractures of the tibia.
确定混合环形固定器在治疗（OTA 41-C型）胫骨近端干骺端和骨干骨折时的刚度特性。
用Synthes、ACE Fischer、Howmedica Monticelli-Spinelli或史赛克创伤Ilizarov混合外固定器或传统Ilizarov钢丝固定器固定五根相同的复合胫骨。对Synthes和Monticelli-Spinelli固定器进行了两次测试，第一次将连接器置于环的外侧，第二次将连接器置于环的内侧。
使用材料试验机施加纯压缩、前后弯曲、内外侧弯曲和扭转。根据载荷变形和扭矩角度曲线计算刚度值。
总体而言，当钢丝与环的连接器置于环内时，Synthes和Monticelli-Spinelli固定器是固定器中最坚固的。一般来说，固定器在轴向压缩时最坚固，在后弯曲时最不坚固。钢丝长度对整体刚度有显著影响。
本研究表明，当用于治疗胫骨近端干骺端和骨干骨折时，四种标准配置的混合外固定器的刚度特性与传统Ilizarov固定器相似。
