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https://www.readbyqxmd.com/read/28095486/three-dimensional-assessment-of-temporomandibular-joint-using-mri-cbct-image-registration
#1
Mohammed A Q Al-Saleh, Kumaradevan Punithakumar, Manuel Lagravere, Pierre Boulanger, Jacob L Jaremko, Paul W Major
PURPOSE: To introduce a new approach to reconstruct a 3D model of the TMJ using magnetic resonance imaging (MRI) and cone-beam computed tomography (CBCT) registered images, and to evaluate the intra-examiner reproducibility values of reconstructing the 3D models of the TMJ. METHODS: MRI and CBCT images of five patients (10 TMJs) were obtained. Multiple MRIs and CBCT images were registered using a mutual information based algorithm. The articular disc, condylar head and glenoid fossa were segmented at two different occasions, at least one-week apart, by one investigator, and 3D models were reconstructed...
2017: PloS One
https://www.readbyqxmd.com/read/28089827/plication-of-the-posterior-capsule-for-intraoperative-posterior-instability-during-anatomic-total-shoulder-arthroplasty
#2
Eduard Alentorn-Geli, Andrew T Assenmacher, John W Sperling, Robert H Cofield, Joaquín Sánchez-Sotelo
BACKGROUND: Restoration of soft tissue balance for intraoperative posterior instability during anatomic total shoulder arthroplasty (TSA) is particularly difficult. The effectiveness of posterior capsular plication (PCP) in restoring soft tissue balance is largely unknown. The purpose of this study was to report the outcomes, complications, and reoperations of primary TSA in which a PCP was performed to correct excessive intraoperative posterior subluxation. METHODS: Thirty-eight shoulders (37 patients) underwent PCP for intraoperative posterior instability during anatomic TSA...
January 12, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28089255/characterization-of-the-walch-b3-glenoid-in-primary-osteoarthritis
#3
Kevin Chan, Nikolas K Knowles, Jean Chaoui, Marc-Olivier Gauci, Louis M Ferreira, Gilles Walch, George S Athwal
BACKGROUND: The type B3 glenoid is an addition to the Walch classification. A potential etiologic theory is that it is a progression of the B2. It is characterized by uniconcavity, absent paleoglenoid, medialization, retroversion, and subluxation. The purpose of this study was to describe the morphology of B3 glenoids. METHODS: Fifty-two patients with B3 glenoids underwent 3-dimensional analysis of computed tomography data. Glenoid measurements (retroversion, inclination, medialization) and humeral head subluxation according to the scapular and glenoid planes were determined...
January 11, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28088244/study-of-the-variability-of-scapular-inclination-and-the-glenoid-version-considerations-for-preoperative-planning-clinical-radiological-study
#4
Petr Fulin, Martin Kysilko, David Pokorny, Radek Padr, Nikola Kasprikova, Ivan Landor, Antonin Sosna
BACKGROUND: Preoperative planning with the aid of imaging methods is a principal factor in successful surgery on the shoulder. This work aims to evaluate the variability of glenoid version, spiralling twist and scapular inclination in relation to the frontal axis. Studies focusing on measuring the variability of scapular inclination in the standardised rest position are lacking in the literature. METHODS: We evaluated 104 CT scans of the shoulder. We measured the glenoid version with respect to the scapular axis at three levels...
January 14, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28078542/glenoid-baseplate-fixation-using-hybrid-configurations-of-locked-and-unlocked-peripheral-screws
#5
Nathan T Formaini, Nathan G Everding, Jonathan C Levy, Brandon G Santoni, Aniruddh N Nayak, Cooper Wilson
BACKGROUND: The use of peripheral locked screws has reduced glenoid baseplate failure rates in reverse shoulder arthroplasty. However, situations may arise when one or more non-locked screws may be preferred. We aimed to determine if different combinations of locked and non-locked screws significantly alter acute glenoid baseplate fixation in a laboratory setting. MATERIALS AND METHODS: Twenty-eight polyurethane trabecular bone surrogates were instrumented with a center screw-type glenoid baseplate and fixated with various combinations of peripheral locked and non-locked screws (1-, 2-, 3- and 4-locked con)...
January 11, 2017: Journal of Orthopaedics and Traumatology: Official Journal of the Italian Society of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/28075438/quantitative-anatomical-differences-in-the-shoulder
#6
Usman Ali Mohammed Syed, Daniel E Davis, Jia-Wei Ko, Brian K Lee, Daniel Huttman, Adam Seidl, Carl Deirmengian, Joseph A Abboud
This study explored the radiographic and anatomical differences in normal shoulders between men and women, as well as factors such as race, height, weight, and age. A total of 205 patients with documented normal anatomical radiographs comprised the study population. Five fellowship-trained orthopedic surgeon reviewers measured head diameter, humeral head size, head to tuberosity distance, greater tuberosity width, neck-shaft angle, surface-arc angle, glenoid neck length, and distance from the lateral acromion process to the greater tuberosity on anteroposterior radiographs with the shoulder in external rotation...
January 11, 2017: Orthopedics
https://www.readbyqxmd.com/read/28068966/glenoid-morphology-in-light-of-anatomical-and-reverse-total-shoulder-arthroplasty-a-dissection-and-3d-ct-based-study-in-male-and-female-body-donors
#7
Sandra Mathews, Marco Burkhard, Nabil Serrano, Karl Link, Martin Häusler, Nakita Frater, Ingeborg Franke, Helena Bischofberger, Florian M Buck, Dominic Gascho, Michael Thali, Steffen Serowy, Magdalena Müller-Gerbl, Gareth Harper, Ford Qureshi, Thomas Böni, Hans-Rudolf Bloch, Oliver Ullrich, Frank-Jakobus Rühli, Elisabeth Eppler
BACKGROUND: Placement of the glenoid baseplate is of paramount importance for the outcome of anatomical and reverse total shoulder arthroplasty. However, the database around glenoid size is poor, particularly regarding small scapulae, for example, in women and smaller individuals, and is derived from different methodological approaches. In this multimodality cadaver study, we systematically examined the glenoid using morphological and 3D-CT measurements. METHODS: Measurements of the glenoid and drill hole tunnel length for superior baseplate screw placement were recorded to define size of the glenoid and the distance to the scapular notch on cadaveric specimens...
January 10, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28064003/a-semi-automated-quantitative-ct-method-for-measuring-rotator-cuff-muscle-degeneration-in-shoulders-with-primary-osteoarthritis
#8
Alexandre Terrier, Julien Ston, Antoine Dewarrat, Fabio Becce, Alain Farron
BACKGROUND: Rotator cuff muscle degeneration is an important parameter to consider when planning shoulder arthroplasty. HYPOTHESIS: We hypothesized that rotator cuff muscle degeneration is correlated with scapulohumeral subluxation in patients planned for anatomical total shoulder arthroplasty (TSA). MATERIALS AND METHODS: We developed a semi-automated quantitative CT method to measure rotator cuff muscle degeneration, and retrospectively analyzed 107 preoperative shoulder CT scans of patients with primary osteoarthritis...
January 4, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28052811/short-term-outcomes-of-mandibular-reconstruction-in-oncological-patients-using-a-cad-cam-prosthesis-including-a-condyle-supporting-a-fibular-free-flap
#9
Achille Tarsitano, Salvatore Battaglia, Valerio Ramieri, Piero Cascone, Leonardo Ciocca, Roberto Scotti, Claudio Marchetti
PURPOSE: Condylar reconstruction and replacement using alloplastic materials currently attracts much surgical interest. The major challenge is to functionally reconstruct the anatomical region; this is crucial in terms of correct mandibular function. The goal of the present study was to evaluate the clinical outcomes of and complications experienced by a series of oncological patients who underwent computer-aided design/computer-aided manufacturing (CAD/CAM) condylar reconstruction following resection-disarticulation of the mandible...
December 16, 2016: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28050992/dautrey-s-procedure-revisited-in-management-of-recurrent-mandibular-dislocation
#10
Joanna Baptist, Mohan Baliga
Mandibular dislocation occurs when the condylar head glides out of the glenoid fossa with the condyle positioned in such a way that its posterior articulating surface lying ahead of the articular eminence. Recurrent mandibular dislocation is relatively uncommon. Patient is extremely distressed and goes through a lot of discomfort. Varied etiologies have been cited in the literature, such as keeping the mouth wide open for long periods of time during dental procedures, yawning, laughing, traumatic injuries to the mandible, psychiatric disturbances, and certain drugs...
January 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28049593/quantitative-and-computed-tomography-anatomic-analysis-of-glenoid-fixation-for-superior-capsule-reconstruction-a-cadaveric-study
#11
Jason M Schon, J Christoph Katthagen, Cameron N Dupre, Justin J Mitchell, Travis Lee Turnbull, Christopher R Adams, Patrick J Denard, Peter J Millett
PURPOSE: To investigate glenoid fixation for superior capsule reconstruction (SCR) and evaluate anchor positions, intraosseous trajectories, and proximity to the suprascapular nerve (SSN) and glenoid fossa. The secondary purpose was to provide technical pearls and pitfalls for anchor insertion on the superior glenoid during SCR. METHODS: Three beath pins were arthroscopically inserted into 12 (n = 12) nonpaired human cadaveric shoulders through Neviaser, anterior, and posterior portals to simulate anchor placement on the superior glenoid during SCR...
December 31, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28049592/traditional-versus-congruent-arc-latarjet-technique-effect-on-surface-area-for-union-and-bone-width-surrounding-screws
#12
Guillaume D Dumont, Bryan G Vopat, Stephen Parada, Randy Cohn, Amun Makani, George Sanchez, Petar Golijanin, Brendin R Beaulieu-Jones, Anthony Sanchez, Matthew T Provencher
PURPOSE: To compare the surface area available for bony contact and the width of bone on each side of the Latarjet fixation screws in the traditional Latarjet technique versus the congruent arc modification of the Latarjet technique. METHODS: Computed tomographic scans of 24 shoulders in patients with glenohumeral instability who underwent multiplanar reconstruction measurements with multiple dimensions of the coracoid. The surface area of the coracoid available for bony contact with the anterior glenoid and width of bone on each side of a 3...
December 31, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28049120/luxatio-erecta-humeri-with-neurovascular-compromise-inferior-glenohumeral-dislocation-illustrating-associated-injuries
#13
David Owen, Mithun Nambiar, Peter Moore, Malcolm Thomas
Luxatio erecta humeri (LEH) is a rare type of shoulder dislocation in which the humeral head becomes trapped beneath the glenoid. Patients present with the arm in a fixed hyperabducted position. LEH is estimated to occur in 0.5% of all shoulder dislocations, most often caused by trauma and has a significant association with local bone, ligament and less frequently neurovascular injury. We present a case with initial neurovascular compromise and sustained neurological impairment at long-term follow-up. Urgent closed reduction is advocated and subsequent treatment is dependent on associated injuries...
October 8, 2016: BMJ Case Reports
https://www.readbyqxmd.com/read/28043316/treatment-of-shoulder-dislocation-with-greater-tuberosity-and-glenoid-fractures
#14
Shah Jehan, Najeeb Mohammad Akhi Baig, Jacob Der Tavitian
Large glenoid fractures are relatively uncommon with shoulder dislocation. Simultaneous glenoid and greater tuberosity fractures with anterior shoulder dislocation are very rare. We report on a 48-year right-handed male who sustained a fall during skiing. He had anterior shoulder dislocation combined with large glenoid fracture and greater tuberosity fracture. He was treated surgically with fixation of the glenoid and greater tuberosity fractures, using two different approaches. The deltopectoral approach with coracoid osteotomy and subscapularis split was used for glenoid fixation...
December 2016: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/28040072/biomechanical-testing-to-evaluate-the-cut-through-resistance-of-intramedullary-nails-for-the-proximal-humerus
#15
Maximilian Wanzl, Peter Foehr, Ulrich Schreiber, Rainer H Burgkart, Andreas Lenich
Intramedullary nailing for stabilization of proximal humeral fractures is well-established. Complications as part of a cut-through, such as backing out of locking screws, loss of reduction, and perforation of the screws into the glenoid, are equally well-known. The test bench presented in this study enables testing of the cut-through behavior of multiple intramedullary implants on a simulated osteoporotic three-part fracture configuration with three different loading circumstances (A, B and C). In situation A, the glenohumeral dynamic force with progressive loadings entered at an angle of 15° to the humeral shaft...
December 2016: Injury
https://www.readbyqxmd.com/read/28038912/effect-of-lateralized-design-on-muscle-and-joint-reaction-forces-for-reverse-shoulder-arthroplasty
#16
William Liou, Yang Yang, Graysen R Petersen-Fitts, Daniel J Lombardo, Sasha Stine, Vani J Sabesan
BACKGROUND: Manufacturers of reverse shoulder arthroplasty (RSA) implants have recently designed innovative implants to optimize performance in rotator cuff-deficient shoulders. These advancements are not without tradeoffs and can have negative biomechanical effects. The objective of this study was to develop an integrated finite element analysis-kinematic model to compare the muscle forces and joint reaction forces (JRFs) of 3 different RSA designs. METHODS: A kinematic model of a normal shoulder joint was adapted from the Delft model and integrated with the well-validated OpenSim shoulder model...
December 27, 2016: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28032029/evaluation-and-treatment-of-internal-impingement-of-the-shoulder-in-overhead-athletes
#17
REVIEW
Keith T Corpus, Christopher L Camp, David M Dines, David W Altchek, Joshua S Dines
One of the most common pathologic processes seen in overhead throwing athletes is posterior shoulder pain resulting from internal impingement. "Internal impingement" is a term used to describe a constellation of symptoms which result from the greater tuberosity of the humerus and the articular surface of the rotator cuff abutting the posterosuperior glenoid when the shoulder is in an abducted and externally rotated position. The pathophysiology in symptomatic internal impingement is multifactorial, involving physiologic shoulder remodeling, posterior capsular contracture, and scapular dyskinesis...
December 18, 2016: World Journal of Orthopedics
https://www.readbyqxmd.com/read/28028575/3d-mr-vs-3d-ct-of-the-shoulder-in-patients-with-glenohumeral-instability
#18
Laurence Stillwater, James Koenig, Bruce Maycher, Michael Davidson
OBJECTIVE: To determine whether 3D-MR osseous reformats of the shoulder are equivalent to 3D-CT osseous reformats in patients with glenohumeral instability. MATERIALS AND METHODS: Patients with glenohumeral instability, who were to be imaged with both CT and MRI, were prospectively selected. CT and MR were performed within 24 h of one another on 12 shoulders. Each MR study included an axial 3D isotropic VIBE sequence. The image data from the isotropic VIBE sequence were post-processed using subtraction and 3D software...
December 27, 2016: Skeletal Radiology
https://www.readbyqxmd.com/read/28025433/three-dimensional-changes-in-the-temporomandibular-joint-after-maxillary-protraction-in-children-with-skeletal-class-iii-malocclusion
#19
Hyunju Lee, Woo-Sung Son, Chun Kwak, Eun-Hee Kang, Seong-Sik Kim, Soo-Byung Park, Yong-Il Kim
We evaluated 3-dimensional changes in the temporomandibular joints of children with skeletal Class III malocclusion and maxillary deficiency after facemask therapy for maxillary protraction. Eighteen children with anterior crossbite and a Class III molar relationship underwent facemask therapy for maxillary protraction, after which they exhibited positive overjet and a Class II molar relationship. Three-dimensional cone-beam computed tomography images of the patients were obtained before (T1) and after (T2) facemask protraction, and the 3-dimensional coordinates of the anatomical landmarks in T1 and T2 images were compared...
2016: Journal of Oral Science
https://www.readbyqxmd.com/read/28024662/quantifying-the-competing-relationship-between-adduction-range-of-motion-and-baseplate-micromotion-with-lateralization-of-reverse-total-shoulder-arthroplasty
#20
Josie Elwell, Joseph Choi, Ryan Willing
Lateralizing the center of rotation (COR) of reverse total shoulder arthroplasty (rTSA) could improve functional outcomes and mitigate scapular notching, a commonly occurring complication of the procedure. However, resulting increases in torque at the bone-implant interface may negatively affect initial fixation of the glenoid-side component, especially if only two fixation screws can be placed. Shoulder-specific finite element (FE) models of four fresh-frozen cadaveric shoulders were constructed. Scapular geometry and material property distributions were derived from CT data...
November 29, 2016: Journal of Biomechanics
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