• Fabrice Alexander Külling, Lukas Ebneter, Georg Stefan Rempfler, and Vilijam Zdravkovic.
• Department of Orthopaedics and Traumatology, Kantonsspital St. Gallen, Rorschacherstrasse 95, 9007, St. Gallen, Switzerland. fabrice.kuelling@kssg.ch.
• Eur Spine J. 2018 May 1; 27 (5): 1172-1177.

PurposeTo prove that a modified closing mechanism of the rongeur gives better precision compared to the old Kerrison rongeur.MethodsForty persons from the departments of orthopaedic surgery, urology and neurosurgery (35 orthopaedic, 2 urology and 3 neurosurgery) took part in the study. All participants were asked to punch ten times in a first step with either the old Kerrison rongeur with the scissors-like handle or the modified punch with a new parallel closing mechanism. In a second step, they punched 10 times with the other instrument. Shaft movement in three dimensions was measured with a stereoscopic, contactless, full-field digital image correlation system.ResultsThe new rongeur is significantly more precise with less movement in all three dimensions. The mechanical model of the new rongeur shows that the momentum needed to keep the tip at the initial position changes only minimally during the closing act on the new model.ConclusionThe new rongeur is more precise compared to the old Kerrison model. It is more robust against changes in the direction of the finger forces and may reduce soreness, fatigue and CTS in spine surgeons.Level Of EvidenceNot applicable: technical study.

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