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[Halm-Zielke instrumentation (Munster Anterior Double Rod System) as an improvement over Zielke-VDS. Surgical method
H Halm1, U Liljenqvist, T Niemeyer
1Klinik und Poliklinik für Allgemeine Orthopädie, Westfälische, Withelms-Universität, Münster.
Introduction And Aim Of The Study:
Halm-Zielke Instrumentation (HZI), in german speaking countries also named the Münster Anterior Doublerod System, was developed to eliminate the disadvantage of VDS-Zielke in terms of lack of primary stability. Additionally sagittal plane control should be improved. Within a prospective clinical trial it was examined, if HZI fulfilled these demands.
Methods:
HZI is an anterior doublerod system with a two screw per vertebral body fixation. The longitudinal components consist of a threaded VDS-rod and a solid rod. 12 consecutive patients with idiopathic scoliosis and curves ranging from 36 degrees to 77 degrees were treated with HZI.
Results:
Correction of the frontal plane averaged 75% and 73.8% postoperatively and at follow-up, respectively. Derotation averaged 49.3%. Thoracolumbar kyphosis was present in four patients and always completely corrected. Implant related complications were not noted. All patients were treated without any additional external immobilisation.
Conclusion:
The aim of improvement of VDS in terms of primary stability and control or improvement of the sagittal plane was completely achieved.