Alexandre Dos Santos1, Maud Creze2, Matthieu Begin3, Elisabeth Laemmel4, Bouchra Assabah5, Marc Soubeyrand6,7. 1. Department of Orthopaedic Surgery, Universitary Hospital of Bicêtre, Public Assistance Hospital of Paris, 78 Rue General Leclerc, 94270, Le Kremlin-Bicêtre, France. 2. Department of Radiology, Universitary Hospital of Bicetre, Public Assistance Hospital of Paris, 78 Rue General Leclerc, 94270, Le Kremlin-Bicêtre, France. 3. Clinique de l'Yvette, 67 Route de Corbeil, 91160, Longjumeau, France. 4. Laboratoire de Microcirculation, Faculté de Médecine de Lariboisière, Université Paris-Diderot, 10 Avenue de Verdun, 75010, Paris, France. 5. Faculty of Medicine, University Paris Sud-XI, 63 rue Gabiel Peri, 94270, Le Kremlin-Bicêtre, France. 6. Department of Orthopaedic Surgery, Universitary Hospital of Bicêtre, Public Assistance Hospital of Paris, 78 Rue General Leclerc, 94270, Le Kremlin-Bicêtre, France. soubeyrand.marc@gmail.com. 7. Faculty of Medicine, University Paris Sud-XI, 63 rue Gabiel Peri, 94270, Le Kremlin-Bicêtre, France. soubeyrand.marc@gmail.com.
Abstract
INTRODUCTION: Proper implantation of a hinged external elbow fixator (HEEF) is demanding since it requires precise alignment between the flexion-extension's and HEEF's axis. In order to optimize this alignment, we have developed a 3D-printed aiming device. The primary goal of the study was to compare the aiming device-based technique with the conventional pin technique. The secondary goal was to determine whether it is possible to share the aiming device with the surgical community. MATERIALS AND METHODS: A HEEF was implanted in cadavers with either the aiming device (n = 6) or the conventional pin technique (n = 6). For both techniques the duration of the procedure, the radiation exposure as well as the offset and angular divergence between the HEEF's and flexion-extension's axis were compared. To achieve the secondary goal, two surgeons used aiming devices 3D-printed from files sent by email in order to implant HEEF on cadaveric specimens (n = 6). RESULTS: Duration of the procedure was not significantly different between both techniques. However, the aiming device allowed for reduction of the number of image intensifier shots (p = 0.005), angular divergence (p = 0.02) and offset between both axes (p = 0.05). The aiming devices have been delivered less than 15 days after ordering, and they have allowed proper implantation of six HEEF. CONCLUSION: The 3D-printed aiming device allowed less irradiant and more accurate implantation of HEEF. It is possible to share it with other surgeons.
INTRODUCTION: Proper implantation of a hinged external elbow fixator (HEEF) is demanding since it requires precise alignment between the flexion-extension's and HEEF's axis. In order to optimize this alignment, we have developed a 3D-printed aiming device. The primary goal of the study was to compare the aiming device-based technique with the conventional pin technique. The secondary goal was to determine whether it is possible to share the aiming device with the surgical community. MATERIALS AND METHODS: A HEEF was implanted in cadavers with either the aiming device (n = 6) or the conventional pin technique (n = 6). For both techniques the duration of the procedure, the radiation exposure as well as the offset and angular divergence between the HEEF's and flexion-extension's axis were compared. To achieve the secondary goal, two surgeons used aiming devices 3D-printed from files sent by email in order to implant HEEF on cadaveric specimens (n = 6). RESULTS: Duration of the procedure was not significantly different between both techniques. However, the aiming device allowed for reduction of the number of image intensifier shots (p = 0.005), angular divergence (p = 0.02) and offset between both axes (p = 0.05). The aiming devices have been delivered less than 15 days after ordering, and they have allowed proper implantation of six HEEF. CONCLUSION: The 3D-printed aiming device allowed less irradiant and more accurate implantation of HEEF. It is possible to share it with other surgeons.
Entities:
Keywords:
3D printing; Elbow instability; Hinged elbow fixator; Terrible triad
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