Simon Lambert1, Nawfal Al-Hadithy1, Mathew David Sewell1, Ralph Hertel2, Norbert Südkamp3, Hansrudi Noser4, Lukas Kamer4. 1. Shoulder Unit Royal National Orthopaedic Hospital, Stanmore, Brockley Hill, Middlesex HA7 4LP, Stanmore, United Kingdom. 2. Lindenhofspital, Bremgartenstrasse, 117-3001, Bern, Switzerland. 3. Department Chirurgie, Klinik für Orthopädie & Unfallchirurgie, Universitätsklinikum Freiburg, Hugstetter Str. 55, D-79117, Freiburg, Germany. 4. Human Morphology Services, AO Research Institute, Davos, Switzerland.
Abstract
UNLABELLED: Previous studies have suggested clavicular morphology is highly variable, particularly in the lateral retrocurved section. Current clavicle fracture plating systems require three dimensional intra-operative contouring to achieve adequate fit and necessitate variable soft tissue dissection placing fracture perfusion and muscular attachments at risk. The aim of this study was to search for a surgically relevant superficial shape pattern. This is a retrospective CT-based analysis of 174 non-pathological clavicles in 95 adults (45 females, 50 males). Using the principle of cylindrical parameterisation generated 3-D computer models, we identified an implant preferred pathway (IPP), defined as a continuous linear region where the least possible soft tissue disruption would be necessary for plate fixation. The IPP mean form was within 3.04 mm (SD ± 1.34) on all clavicles. Clavicle length, and not shape, was found to be the biggest variable (correlation between size and form co-ordinates r = 0.99, p < 0.05), accounting for 79% of overall variability. This length variation was mainly located in the medial antecurved section. Superior convexity and recurvatum were the main shape variables, however they only contributed 8% and 5% to the overall variation, respectively. Three IPP lengths were shown to match all clavicles when aligned at the acromial end first. In contrast to previous studies, we have shown that the IPP is fairly consistent with respect to the general shape with the exception of length variation which mainly affected the medial antecurved section.
UNLABELLED: Previous studies have suggested clavicular morphology is highly variable, particularly in the lateral retrocurved section. Current clavicle fracture plating systems require three dimensional intra-operative contouring to achieve adequate fit and necessitate variable soft tissue dissection placing fracture perfusion and muscular attachments at risk. The aim of this study was to search for a surgically relevant superficial shape pattern. This is a retrospective CT-based analysis of 174 non-pathological clavicles in 95 adults (45 females, 50 males). Using the principle of cylindrical parameterisation generated 3-D computer models, we identified an implant preferred pathway (IPP), defined as a continuous linear region where the least possible soft tissue disruption would be necessary for plate fixation. The IPP mean form was within 3.04 mm (SD ± 1.34) on all clavicles. Clavicle length, and not shape, was found to be the biggest variable (correlation between size and form co-ordinates r = 0.99, p < 0.05), accounting for 79% of overall variability. This length variation was mainly located in the medial antecurved section. Superior convexity and recurvatum were the main shape variables, however they only contributed 8% and 5% to the overall variation, respectively. Three IPP lengths were shown to match all clavicles when aligned at the acromial end first. In contrast to previous studies, we have shown that the IPP is fairly consistent with respect to the general shape with the exception of length variation which mainly affected the medial antecurved section.
Authors: Charlotte Arand; Daniel Wagner; Robert Geoff Richards; Hansrudi Noser; Lukas Kamer; Takeshi Sawaguchi; Pol M Rommens Journal: J Anat Date: 2018-12-21 Impact factor: 2.610
Authors: Arabella D Fontana; Harry A Hoyen; Michael Blauth; André Galm; Marcel Schweizer; Christoph Raas; Martin Jaeger; Chunyan Jiang; Stefaan Nijs; Simon Lambert Journal: JSES Int Date: 2020-06-19