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Augmented Statistical Shape Modeling for Orthopedic Surgery and Rehabilitation
Published in de Azevedo-Marques Paulo Mazzoncini, Mencattini Arianna, Salmeri Marcello, Rangayyan Rangaraj M., Medical Image Analysis and Informatics: Computer-Aided Diagnosis and Therapy, 2018
Bhushan Borotikar, Tinashe Mutsvangwa, Valérie Burdin, Enjie Ghorbel, Mathieu Lempereur, Sylvain Brochard, Eric Stindel, Christian Roux
As described earlier, the scapular bone data consisted of two sets, one with 27 bones and another with 54 healthy bones. The test of anatomical validity required manual selection of clinically significant anatomical landmarks on scapula SSM and checking its correspondence quality with scapulae models within or outside the training set. However, scapula SSM, being the probabilistic representation of all the instances, was too smooth to exhibit the correct location of anatomical landmarks, and, thus, selecting landmarks directly on the SSM was not realistic. Instead, landmarks were selected on the MV estimates of the training scapulae models, and later, the mean of these landmarks was transferred to MV shape to build augmented SSM(s). This was achieved by selecting a set of 16 anatomical landmarks on the MV estimates of the scapula models. Specifically, (1) six landmarks were located on glenoid rim surrounding glenoid cavity (Figure 17.29a), (2) four landmarks were located on the medial and superior edges of subscapular fossa (scapula blade) (Figure 17.29b), (3) four landmarks were located on the acromion (Figure 17.29c), and (4) one landmark each was located on the coracoid process and the notch made by scapular spine with supraspinous fossa (Figure 17.29d). Reliability of this manual selection process was determined using intra- and inter-observer reliability tests. A landmark selection guide (Appendix 17B) was prepared in order to train future users and to guide the observers of this study.
The effect of intracortical bone pin on shoulder kinematics during dynamic activities
Published in International Biomechanics, 2019
Maryam Hajizadeh, Benjamin Michaud, Mickael Begon
Data collection was performed in two sessions in a single day, for each participant. For session 1 (SKIN), 22 skin markers were attached to the left clavicle (5), scapula (4), humerus (7) and thorax (6) based on the model introduced by Jackson et al. (2012). Their locations were previously marked on the skin with a pencil to replace them accurately if they had to be removed during the surgery. For session 2 (PIN), three intercortical bone pins were added (left clavicle, scapular spine and deltoid insertion). The insertion of pins was performed by a surgeon, following local anaesthesia (see Dal Maso et al. (2014) for details). Pin locations were adjusted to avoid muscles, nerves and blood vessels as well as any contact of pins with head, neck and skin markers during movements. Marker trajectories were recorded using 18-camera VICONTM optoelectronic motion analysis system (Oxford Metrics Ltd, Oxford, UK) at 300 Hz.