@inproceedings{Amadi:2010, author = {Amadi, HO and Bull, AMJ}, title = {Protocol and Validation of a Computer Method for Determining Glenohimeral Ligament Attachments in vivo}, year = {2010} }
TY - CPAPER AB - INTRODUCTION:Modelling the glenohumeral ligaments (GHL) kinematics in vivo has been hampered by poor imaging contrast of their bony attachments during function. The overcome of this problem may lead to a better understanding of their functions during different aspects of glenohumeral joint (GHJ) manoeuvres. A previous study has published a computational tool that reconstructs specified physiological kinematics of the glenohumeral joint (GHJ) bones1. Tracking the motion of the position vectors of GHL attachments on these bones would allow information on how the tissues are stretching, folding, and wrapping around the bones to be gained. The aim of this work was to develop and validate a protocol that allows the prediction of GHL attachments on a patient-specific glenoid and humerus.METHOD:Computed tomography scans of GHJ bones (humerus and scapula) were used in this study. All bones and their respective anatomical neck (AN) and glenoid rim (GR) outlines were individually reconstructed into 3-D surface meshes with interconnecting nodal vectors. Four reference nodal vectors were extracted. These corresponded to the positions of the humeral fovea capitis (f), humeral central superolateral point (p), scapular biceps insertion (b) and an arbitrary glenoid anterior point (a). The AN and GR were applied to quantify the normal vectors (vn) to their host plane-fits and the centres (c) of circle-fits. These were used in a ‘face-of-the-clock’ coordinate with early hours in the anatomical anterior direction. Dial unit vectors ucf and ucb (from centres c to reference points f and b respectively) were applied to a vector rotation algorithm2 to quantify the direction of a GHL attachment v when an angular position input φ° specified this in clock-face. The quantified direction was finally applied to the bone volume to identify the closest surface node as the locus of the attachment position.Algorithm Validation: 50 specimens (21 humeri and 29 scapulae) were ap AU - Amadi,HO AU - Bull,AMJ PY - 2010/// TI - Protocol and Validation of a Computer Method for Determining Glenohimeral Ligament Attachments in vivo ER -