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https://www.readbyqxmd.com/read/28630752/acromion-and-glenoid-shape-why-are-they-important-predictive-factors-for-the-future-of-our-shoulders
#1
Richard W Nyffeler, Dominik C Meyer
The shape of the acromion differs between patients with degenerative rotator cuff tears and individuals without rotator cuff pathology.It can be assessed in the sagittal plane (acromion type, acromion slope) and in the coronal plane (lateral acromion angle, acromion index, critical shoulder angle).The inter-observer reliability is better for the measurements in the coronal plane.A large lateral extension (high acromion index or high critical shoulder angle) and a lateral down-sloping of the acromion (low lateral acromion angle) are associated with full-thickness supraspinatus tears...
May 2017: EFORT open reviews
https://www.readbyqxmd.com/read/28602259/assessment-of-condyle-position-fossa-morphology-and-disk-displacement-in-symptomatic-patients
#2
Katharina Alves Rabelo, Saulo Leonardo Sousa Melo, Marianna Guanaes Gomes Torres, Larissa Rangel Peixoto, Paulo Sérgio Flores Campos, Iêda Margarida Crusoé Rocha Rebello, Daniela Pita de Melo
OBJECTIVE: The aim of the study was to determine whether there are any associations between the morphology of the glenoid fossa, articular spaces, and disk displacement by evaluating the magnetic resonance imaging (MRI) scans of symptomatic patients. Gender and age were also evaluated for any effect on the parameters. STUDY DESIGN: MRI scans of 199 temporomandibular joints were assessed for the morphology of the glenoid fossa and articular spaces in both sagittal and coronal views...
April 19, 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/28600884/physiological-effects-of-anterior-repositioning-splint-on-temporomandibular-joint-disc-displacement-a-quantitative-analysis
#3
Hui-Min Chen, Mu-Qing Liu, Adrian U-Jin Yap, Kai-Yuan Fu
BACKGROUND: Anterior repositioning splints (ARS) are used primarily for the management of temporomandibular joint (TMJ) anterior disc displacement with reduction (ADDwR). However, the exact physiological effects of ARS are still unclear. OBJECTIVE: This study investigated the short and long-term effects of ARS on disc and condyle angles / positions by metric analysis. METHODS: 22 subjects diagnosed with ADDwR were recruited. Maxillary full-coverage ARS were fabricated and MRI of TMJs were obtained before splint treatment, immediate post-insertion and 6 months after splint treatment...
June 10, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28576698/impact-of-shoulder-rotation-on-neck-shaft-angle-a-clinical-study
#4
J H Assunção, E A Malavolta, R A Beraldo, M E C Gracitelli, M Bordalo-Rodrigues, A A Ferreira Neto
BACKGROUND: Two recent experimental studies evaluated the influence of shoulder rotation on neck-shaft angle, with conflicting results. However, there have been no clinical studies of whether this angle varies in different shoulder positions. The present study aimed to determine whether shoulder rotation affects neck-shaft angle on standard radiographs in patients with complaints of shoulder pain. HYPOTHESIS: Shoulder rotation does not affect neck-shaft angle. MATERIALS AND METHODS: A prospective study was conducted in selected patients with shoulder pain...
May 30, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28545718/the-effect-of-glenoid-component-version-and-humeral-polyethylene-liner-rotation-on-subluxation-and-impingement-in-reverse-shoulder-arthroplasty
#5
Vijay N Permeswaran, Andrea Caceres, Jessica E Goetz, Donald D Anderson, Carolyn M Hettrich
BACKGROUND: A previously validated finite element modeling approach was used to determine how changes in glenoid component version and polyethylene liner rotation within the humeral component affect the arm abduction angle at which impingement between the inferior glenoid and the polyethylene liner occurs as well as the amount of subluxation generated by that impingement. MATERIALS AND METHODS: Five glenoid component versions (5° anteversion; neutral; 5°, 10°, and 20° retroversion) and 7 polyethylene liner rotations (20° and 10° anterior; neutral; 10°, 20°, 30°, and 40° posterior) were considered, resulting in 35 different clinically representative models...
May 22, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28528016/the-influence-of-humeral-neck-shaft-angle-and-glenoid-lateralization-on-range-of-motion-in-reverse-shoulder-arthroplasty
#6
Birgit S Werner, Jean Chaoui, Gilles Walch
BACKGROUND: Recent developments in reverse shoulder arthroplasty (RSA) have focused on changes in several design-related parameters, including humeral component design, to allow for easier convertibility. Alterations in humeral inclination and offset on shoulder kinematics may have a relevant influence on postoperative outcome. This study used a virtual computer simulation to evaluate the influence of humeral neck shaft angle and glenoid lateralization on range of motion in onlay design RSA...
May 17, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28514491/3d-image-based-morphometric-analysis-of-the-scapular-neck-length-in-subjects-undergoing-reverse-shoulder-arthroplasty
#7
P Simon, M Diaz, M Cusick, B Santoni, M Frankle
INTRODUCTION: Scapular notching after RSA may, in part, be related to a patient's scapular morphology. The purpose of this study was to develop a novel 3D measurement technique to describe infraglenoid tubercle morphometry. We hypothesize that the parameters describing infraglenoid tubercle would be normally distributed and would correlate with individual's demographics and glenoid morphometry. MATERIALS AND METHODS: A group of 110 subjects treated with RSA were evaluated...
May 17, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28506491/mapping-of-glenoid-bone-loss-in-recurrent-anterior-shoulder-instability-is-there-a-particular-deficit-pattern
#8
Benjamin Bockmann, Arne Johannes Venjakob, Frank Reichwein, Marthe Hagenacker, Wolfgang Nebelung
BACKGROUND: Glenoid bone loss in recurrent anterior shoulder instability is a challenging problem for shoulder surgeons, and knowledge about the anatomy of glenoid deficits is scarce. In this study, we tried to evaluate the pattern of this pathology. METHODS: Our analysis included 44 shoulders from 44 patients with recurrent anterior shoulder instability accompanied by a clinically relevant glenoid bone loss. The defect size, the localization of the inferior defect edge, and the defect angle were measured, and osseous landmarks were identified...
May 11, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28488015/no-relationship-between-critical-shoulder-angle-and-glenoid-erosion-after-shoulder-hemiarthroplasty-a-comparative-radiographic-study
#9
S Cerciello, B J Morris, E Visonà, K Corona, T B Edwards, N Maffulli, G Walch
INTRODUCTION: Symptomatic glenoid erosion is one of the most common causes of functional impairment after shoulder hemiarthroplasty. A decrease in the critical shoulder angle (CSA) has been associated with the development of shoulder arthritis. The inter-observer reliability of the CSA and the relationship between CSA and symptomatic glenoid erosion after shoulder hemiarthroplasty were investigated. MATERIALS AND METHODS: Twenty-eight patients with symptomatic glenoid erosion after anatomic hemiarthroplasty were compared to a control group of 30 patients with no signs of symptomatic glenoid erosion...
May 9, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28463922/ultrasound-screening-for-posterior-shoulder-dislocation-in-infants-with-persistent-brachial-plexus-birth-palsy
#10
Andrea S Bauer, Justin F Lucas, Nasser Heyrani, Ryan L Anderson, Leslie A Kalish, Michelle A James
BACKGROUND: Early detection of posterior shoulder dislocation in infants with brachial plexus birth palsy (BPBP) is essential, but it may be difficult to accomplish with physical examination alone. The aim of this study was to determine the prevalence of shoulder dislocation in patients with BPBP using ultrasound and to identify which physical examination measurements correlated most with dislocation in these patients. METHODS: This study was a retrospective review of data obtained in an ultrasound screening program of infants with BPBP born from January 2011 to April 2014...
May 3, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28451621/is-there-an-association-between-the-critical-shoulder-angle-and-clinical-outcome-after-rotator-cuff-repair
#11
Jacob M Kirsch, Amit Nathani, Christopher B Robbins, Joel J Gagnier, Asheesh Bedi, Bruce S Miller
BACKGROUND: Variations in scapular morphology have been associated with the development of atraumatic rotator cuff tears (RCTs). The critical shoulder angle (CSA) accounts for both glenoid inclination and lateral extension of the acromion. The impact of the CSA on outcomes after rotator cuff repair (RCR) has not been investigated previously. HYPOTHESIS: Our hypothesis was that individuals with smaller CSAs will have better patient-reported outcome scores over time compared with those with larger CSAs...
April 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28412107/glenoid-morphology-in-obstetrical-brachial-plexus-lesion-a-three-dimensional-computed-tomography-study
#12
Lars H Frich, Pernille H Schmidt, Trine Torfing
BACKGROUND: Obstetric brachial plexus lesion (OBPL) frequently leads to glenohumeral dysplasia, and excessive retroversion of the glenoid is among the best known developmental disturbances. Most analyses of the glenoid are based on 2-dimensional (D) imaging and do not address glenoid inclination or provide information on the glenoid in the sagittal plane. We aim to describe the 3-D deformity of the glenoid in children with OBPL. METHODS: Preoperative computed tomography (CT) scans of the nonaffected and the affected scapula of 24 children (aged 5 to 12 years) with developmental disturbances after OBPL years were analyzed...
April 12, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28372967/is-the-two-dimensional-computed-tomography-scan-analysis-reliable-for-coracoid-graft-positioning-in-latarjet-procedures
#13
Johannes Barth, Lionel Neyton, Pierre Métais, Jean-Claude Panisset, Laurent Baverel, Gilles Walch, Laurent Lafosse
BACKGROUND: The aim of the study was to develop a computed tomography (CT)-based measurement protocol for coracoid graft (CG) placement in both axial and sagittal planes after a Latarjet procedure and to test its intraobserver and interobserver reliability. METHODS: Fifteen postoperative CT scans were included to assess the intraobserver and interobserver reproducibility of a standardized protocol among 3 senior and 3 junior shoulder surgeons. The evaluation sequence included CG positioning, its contact area with the glenoid, and the angle of its screws in the axial plane...
March 31, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28359696/partial-thickness-tears-involving-the-rotator-cable-lead-to-abnormal-glenohumeral-kinematics
#14
Gregory J Pinkowsky, Neal S ElAttrache, Alexander B Peterson, Masaki Akeda, Michelle H McGarry, Thay Q Lee
HYPOTHESIS: The objective of this study was to determine the biomechanical function of the rotator cable when a partial-thickness (>50%) tear is present. We compared intact specimens with partial tears of the anterior cable followed by partial anterior and posterior tears in regard to glenohumeral kinematics and translation. The hypothesis was that partial-thickness tears will lead to abnormal glenohumeral biomechanics, including glenohumeral translation and path of glenohumeral articulation...
March 27, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28261432/comparison-of-clinical-and-radiological-results-according-to-glenosphere-position-in-reverse-total-shoulder-arthroplasty-a-short-term-follow-up-study
#15
Chang Hyuk Choi, Sung Guk Kim, Jae Jun Lee, Byung Hoon Kwack
BACKGROUND: In a previous biomechanical study, eccentric glenospheres with more inferior position of the center of rotation were shown to improve range of motion and reduce the incidence of scapular notching after reverse total shoulder arthroplasty (RSA). The purpose of this study was to compare the clinical and radiological results of RSA using an eccentric glenosphere to those using a concentric glenosphere and to determine the usefulness of the eccentric glenosphere. METHODS: From 2009 to 2015, we performed a retrospective review of 20 consecutive patients who underwent RSA using a deltopectoral approach...
March 2017: Clinics in Orthopedic Surgery
https://www.readbyqxmd.com/read/28215115/correlation-between-anatomy-of-the-scapula-and-the-incidence-of-rotator-cuff-tear-and-glenohumeral-osteoarthritis-via-radiological-study
#16
Mohd Fairudz Bin Mohd Miswan, Mohd Shahril Bin Ahmad Saman, Teo Seow Hui, Mohamed Zubair Mohamed Al-Fayyadh, Mohamed Razif Bin Mohamed Ali, Ng Wuey Min
INTRODUCTION: We conducted a study to elucidate the correlation between the anatomy of the shoulder joint with the development of rotator cuff tear (RCT) and glenohumeral osteoarthritis (GHOA) by using acromioglenoid angle (AGA). MATERIALS AND METHODS: The AGA is a new measured angle formed between the line from midglenoid to lateral end of the acromion with the line parallel to the glenoid surface. The AGA was measured in a group of 85 shoulders with RCT, 49 with GHOA and 103 non-RCT/GHOA control shoulders...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28211284/decreased-axial-coracoid-inclination-angle-is-associated-with-rotator-cuff-tears
#17
Carlos Torrens, Eduard Alentorn-Geli, Juan Francisco Sanchez, Anna Isart, Fernando Santana
PURPOSE: Coracoid morphology has been related to coracoid impingement mainly resulting in anterior shoulder pain aggravated by forward flexion and internal rotation. However, the coracoid process morphology can also affect the inclination of the coracoacromial ligament and subsequently the subacromial space in the same way that acromial slope does. The purpose of this study was to evaluate the influence of the coracoid body-glenoid surface, coracoid tip-glenoid surface, and coracoid body-coracoid tip angles (coracoid inclination angles) on rotator cuff tears (RCTs)...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28159312/effects-of-anterior-offsetting-of-humeral-head-component-in-posteriorly-unstable-total-shoulder-arthroplasty-finite-element-modeling-of-cadaver-specimens
#18
Gregory S Lewis, William K Conaway, Hwabok Wee, H Mike Kim
A novel technique of "anterior offsetting" of the humeral head component to address posterior instability in total shoulder arthroplasty has been proposed, and its biomechanical benefits have been previously demonstrated experimentally. The present study sought to characterize the changes in joint mechanics associated with anterior offsetting with various amounts of glenoid retroversion using cadaver specimen-specific 3-dimensional finite element models. Specimen-specific computational finite element models were developed through importing digitized locations of six musculotendinous units of the rotator cuff and deltoid muscles based off three cadaveric shoulder specimens implanted with total shoulder arthroplasty in either anatomic or anterior humeral head offset...
February 28, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28131692/radiographic-characterization-of-the-b2-glenoid-is-inclusion-of-the-entirety-of-the-scapula-necessary
#19
Peter N Chalmers, Dane Salazar, Aaron Chamberlain, Jay D Keener
BACKGROUND: Computed tomography (CT) scans are often obtained before total shoulder arthroplasty to assess glenoid deformity. To allow correction of the slice axis into the plane of the scapula, these scans have typically required inclusion of the entirety of the scapula. The purpose of this study was to determine whether inclusion of the medial border and inferior angle is necessary for accurate measurement of scapular version, inclination, and humeral subluxation. METHODS: Fourteen CT scans in preoperative total shoulder arthroplasty patients with Walch B2 type glenoids underwent a standardized measurement protocol...
May 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28128440/evolution-of-the-hominoid-scapula-and-its-implications-for-earliest-hominid-locomotion
#20
Michael S Selby, C Owen Lovejoy
OBJECTIVES: The higher primate scapula has been subject to many explanations of the putative "adaptive value" of its individual traits. However, the shift from the bone's position in above branch quadrupeds to its more posterolateral position in recent hominoids obviously required fundamental changes to its general form. We hypothesize that most features argued to be individually adaptive are more likely secondary consequences of changes in its fundamental bauplan, a view more consistent with modern developmental biology...
April 2017: American Journal of Physical Anthropology
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