Schütz M, Südkamp N, Frigg R, Hoffman R, Stöckle U, Haas N
Department of Trauma and Reconstructive Surgery, Charité/Virchow Klinikum, Humboldt University of Berlin, Germany.
Clin Orthop Relat Res. 1998 Feb(347):35-42.
A major drawback of conventional fixator systems is the penetration of the fixator pins into the medullary canal. The pins create a direct link between the medullary cavity and the outer environment. The new AO pinless fixator bypasses this disadvantage by clamping its trocar points onto the outer cortex without penetrating it. Thus, exposure and consequent contamination of the medullary cavity does not occur. The clinical use of this easily manageable fixator with no drilling requirement is for tibial fractures in which the general and local conditions are poor or the infrastructure of the clinic is inadequate for primary internal stabilization or both. All options for a later conversion to internal fixation remain open. For highly unstable tibial shaft fractures, the pinless fixator can be applied as an additional, minimally invasive, external, locked system to increase the stability of intramedullary nail fixation. The pinless external fixator can be combined favorably with the standard AO tubular system and is a valuable addition to the existing fixator systems.
传统固定器系统的一个主要缺点是固定针会穿入髓腔。这些针在髓腔和外部环境之间建立了直接联系。新型AO无针固定器通过将其套管尖端夹在外皮质上而不穿透它，从而避免了这一缺点。因此，不会发生髓腔的暴露及随之而来的污染。这种易于操作且无需钻孔的固定器在临床上适用于全身及局部状况较差或诊所基础设施不足以进行一期内固定或两者皆有的胫骨骨折。后期转换为内固定的所有选择仍然可行。对于高度不稳定的胫骨干骨折，无针固定器可作为一种额外的、微创的、外部锁定系统应用，以增加髓内钉固定的稳定性。无针外固定器可与标准AO管状系统良好结合，是现有固定器系统的一个有价值的补充。
