Moroni A, Aspenberg P, Toksvig-Larsen S, Falzarano G, Giannini S
Ninth Department of Orthopaedic Surgery, Bologna University, Rizzoli Orthopaedic Institute, Italy.
Clin Orthop Relat Res. 1998 Jan(346):171-7.
Three groups of seven patients had external fixation of middiaphyseal tibial fractures using uncoated pins, uncoated bicylindrical pins, and hydroxyapatite coated bicylindrical pins, respectively. All fractures were fixed with six pins, and all fractures united. Median pin insertion torque was 0.6, 1.2, and 1.3 Nm in the three groups, respectively. Median extraction torque was 0.1, 0.1, and 2.1 Nm, respectively. Both types of stainless steel pins showed a lower extraction torque than insertion torque in all cases, whereas the mean extraction torque in the hydroxyapatite coated pins was unchanged. Seven of the 14 patients receiving uncoated pins had pin tract infection, compared with none of the patients receiving hydroxyapatite coated pins. Hydroxyapatite coating of external fixation pins increases stability and thereby reduces the risk for pin tract infection and mechanical failure of fracture fixation.
三组患者，每组七人，分别使用未涂层钢针、未涂层双圆柱钢针和羟基磷灰石涂层双圆柱钢针进行胫骨干中段骨折的外固定。所有骨折均用六根钢针固定，且所有骨折均愈合。三组的钢针插入扭矩中位数分别为0.6、1.2和1.3牛米。拔出扭矩中位数分别为0.1、0.1和2.1牛米。在所有病例中，两种类型的不锈钢钢针的拔出扭矩均低于插入扭矩，而羟基磷灰石涂层钢针的平均拔出扭矩没有变化。接受未涂层钢针治疗的14名患者中有7人发生针道感染，而接受羟基磷灰石涂层钢针治疗的患者无一发生针道感染。外固定钢针的羟基磷灰石涂层可增加稳定性，从而降低针道感染风险和骨折固定的机械故障风险。
