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Angle to the glenoid

Timothy L Kahn, Erin K Granger, Heath B Henninger, Robert Z Tashjian, Peter N Chalmers
BACKGROUND: It remains unclear whether changes in scapular rotation influence the surgeon's ability to achieve resting radiographic neutral or inferior baseplate tilt at final follow-up. The purposes of this study were (1) to determine whether reverse total shoulder arthroplasty (RTSA) changes the resting scapular rotation, (2) to determine the association between glenoid inclination with respect to the scapula (β angle) and resting scapular rotation, and (3) to determine the β angle threshold that will most likely lead to resting radiographic neutral or inferior baseplate tilt relative to the thorax...
April 13, 2019: Journal of Shoulder and Elbow Surgery
Pascal Boileau, Marc-Olivier Gauci, Eric R Wagner, Gilles Clowez, Jean Chaoui, Mikaël Chelli, Gilles Walch
BACKGROUND: Avoiding superior inclination of the glenoid component in reverse shoulder arthroplasty (RSA) is crucial. We hypothesized that superior inclination was underestimated in RSA. Our purpose was to describe and assess a new measurement of inclination for the inferior portion of the glenoid (where the baseplate rests). METHODS: The study included 47 shoulders with rotator cuff tear arthropathy (mean age, 76 years). The reverse shoulder arthroplasty angle (RSA angle), defined as the angle between the inferior part of the glenoid fossa and the perpendicular to the floor of the supraspinatus, was compared with the global glenoid inclination (β angle or total shoulder arthroplasty [TSA] angle)...
March 29, 2019: Journal of Shoulder and Elbow Surgery
Matthijs Jacxsens, Shireen Y Elhabian, Sarah E Brady, Peter N Chalmers, Robert Z Tashjian, Heath B Henninger
BACKGROUND: Although scapular morphology contributes to glenohumeral osteoarthritis and rotator cuff disease, its role in traumatic glenohumeral instability remains unknown. We hypothesized that coracoacromial and glenoid morphology would differ between healthy subjects and patients with recurrent traumatic anterior shoulder instability. METHODS: Computed tomography scans of 31 cadaveric control scapulae and 54 scapulae of patients with recurrent traumatic anterior shoulder instability and Hill-Sachs lesions were 3-dimensionally reconstructed...
March 27, 2019: Journal of Shoulder and Elbow Surgery
Riccardo Maria Lanzetti, Marco Spoliti
PURPOSE: To propose a geometric model to quantify the bone defect and the glenoid medialisation (in millimetres) compared to the native joint line. We also evaluated the reliability of this geometric model. METHODS: Using two-dimensional CT imaging, we built a hypothetical triangle on the axial scan consisting of the following: side A, length (millimetres) of the glenoid bone; side B, average length (millimetres) of the glenoid in a healthy population; side C, the missing side; and angle α, the retroversion angle calculated using the Friedman method...
March 27, 2019: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
Jun Kawakami, Nobuyuki Yamamoto, Toshimitsu Etoh, Taku Hatta, Mitsuyoshi Mineta, Eiji Itoi, Ryohei Isawa
BACKGROUND: The glenoid track concept has been widely used to assess the risk of instability caused by a bipolar lesion. The mean glenoid track width is reported to be 83% of the glenoid width. However, this width seems to be affected by the range of motion of the shoulder. By clarifying the relationship between the range of shoulder motion and the glenoid track width, a more precise determination of the glenoid track width for each individual could be possible. PURPOSE: To determine the relationship between the glenoid track width and the range of motion of healthy volunteers...
March 2019: American Journal of Sports Medicine
Sung-Min Rhee, Jeong Dong Lee, Yong Bok Park, Jae Chul Yoo, Joo Han Oh
Background: Despite the growing use of reverse shoulder arthroplasty (RSA), it is associated with relatively frequent complications and uncertain clinical outcomes. We investigated radiological factors affecting clinical outcomes of RSA in the Korean population. Methods: We evaluated physical findings, radiographic findings, visual analog scale scores for pain and satisfaction, and several functional scores in 179 consecutive patients who underwent RSA at two centers between 2008 and 2014...
March 2019: Clinics in Orthopedic Surgery
Nikhil N Dixit, Daniel C McFarland, Katherine R Saul
Children affected with brachial plexus birth injury (BPBI) undergo muscle paralysis. About 33% of affected children experience permanent osseous deformities of the glenohumeral joint. Recent evidence suggests that some cases experience restricted muscle longitudinal growth in addition to paralysis and reduced range of motion at the shoulder and elbow. It is unknown whether altered loading due to paralysis, muscle growth restriction and contracture, or static loading due to disuse is the primary driver of joint deformity after BPBI...
February 2, 2019: Journal of Biomechanics
Aude Griffart, Pauline Joly-Monrigal, Julien Andrin, Cyril Lazerges, Michel Chammas, Bertrand Coulet
BACKGROUND: Malunion of the proximal humerus is common and variably tolerated. Classifications developed for proximal humerus malunion (PHM) rely on standard radiographs, which underestimate bone fragment displacement and lack accuracy. The clinical tolerance of PHM is subjective, and revision surgery is not always necessary. The primary objective of this study was to assess the reproducibility and relevance of four CT angle measurements for objectively quantifying the morphological disharmony caused by PHM in a control population then in a population with PHM...
February 7, 2019: Orthopaedics & Traumatology, Surgery & Research: OTSR
Paolo Di Benedetto, Alessandro Beltrame, C Cicuto, C Battistella, Renato Gisonni, Vanni Cainero, Araldo Causero
BACKGROUND AND AIM OF THE WORK: It is recognised that a significant percetage of large and massive rotator cuff tears (RCT) cannot be anatomically repaired and this correlates with a worste outcome in terms of pain, active range of motion, increased incidence of retair. The aim of our work is to find reliable index on preoperative MRI shoulder image to assist orthopaedist in surgical planning of rotatator cuff tears repair. METHODS: We performed a retrospective study on a population on 131 patients undergoing arthroscopic cuff repair by a single expert surgeon...
January 10, 2019: Acta Bio-medica: Atenei Parmensis
Giovanni Di Giacomo, Luigi Piscitelli, Mattia Pugliese
Shoulder stability depends on several factors, either anatomical or functional. Anatomical factors can be further subclassified under soft tissue (shoulder capsule, glenoid rim, glenohumeral ligaments etc) and bony structures (glenoid cavity and humeral head).Normal glenohumeral stability is maintained through factors mostly pertaining to the scapular side: glenoid version, depth and inclination, along with scapular dynamic positioning, can potentially cause decreased stability depending on the direction of said variables in the different planes...
December 2018: EFORT Open Reviews
Taiki Matsuo, Fumio Morita, Daisuke Tani, Hitomi Nakamura, Yasuo Higurashi, Junji Ohgi, Claudius Luziga, Naomi Wada
The mammalian forelimb is adapted to different functions including postural, locomotor, feeding, exploratory, grooming and defence. Comparative studies on morphology of the mammalian scapula have been performed in an attempt to establish the functional differences in the use of the forelimb. In this study, a total of 102 scapulae collected from 66 species of animals, representatives of all major taxa from rodents, sirenians, marsupials, pilosa, cetaceans, carnivores, ungulates, primates and apes, were analysed...
January 29, 2019: Anatomia, Histologia, Embryologia
Abdul Hadi Abdul Wahab, Amir Putra Md Saad, Muhammad Noor Harun, Ardiyansyah Syahrom, Muhammad Hanif Ramlee, Mohd Ayob Sulong, Mohammed Rafiq Abdul Kadir
Intact glenoid labrum is one of passive stabilizer for glenohumeral joint, which have various stiffness at different region. The aim of this study is to develop new artificial glenoid labrum from Polyvinyl Alcohol (PVA) hydrogel, which known as good biomaterial due to its biocompatibility and ability to tailor its modulus. PVA hydrogel was formed using freeze-thaw (FT) method and the stiffness of PVA was controlled by manipulating the concentration of PVA and number of FT cycles. Then, the gradual stiffness was formed using simple diffusion method by introducing the pre-freeze-and-thaw steps...
December 26, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Jonathan Rassi, Naveen Subhas, Jennifer Bullen, Michael Forney, Joshua Polster
OBJECTIVE: To characterize the appearance, location, severity, and prevalence of focal glenoid retroversion on shoulder MRI in professional baseball pitchers versus age-matched controls. MATERIALS AND METHODS: In this retrospective review, two musculoskeletal radiologists evaluated shoulder MRI examinations from 40 professional baseball pitchers and 40 age-matched controls. Images were scored for the presence of a focal posterior glenoid convexity and the clock face positions involved...
January 21, 2019: Skeletal Radiology
Matthaeus Cieciera, Ralf Schoeniger, Ujwal Bhure, Klaus Strobel
Scapular notching (SN) is a unique complication in reverse shoulder arthroplasty, caused by repetitive impingement of the humeral polyethylene liner against the inferior scapular neck. It occurs in up to 96% of cases, with bone loss beneath the glenoid baseplate and polyethylene wear. SN can be associated with pain, decreased range of motion, and might result in glenoid implant failure. Modification of glenosphere design and humeral neck angle showed substantially less SN. SPECT/CT is a promising tool providing combined morphologic and metabolic information in symptomatic SN...
January 4, 2019: Clinical Nuclear Medicine
Pallavi Sirana, Narendra Kumar, Anshu Malhotra, Nandini Singhal, Nisha Chaudhary
AIM: To compare the intraoral gothic tracing method with panoramic radiographs in patients requiring complete dentures. MATERIALS AND METHODS: The present study was conducted on 20 edentulous subjects of both genders. Hanau Wide-Vue semi-adjustable articulator was used to record sagittal condylar guidance in all patients. Panoramic radiographs were taken in all patients and Frankfurt horizontal plane was traced on both sides of orthopantomogram (OPG) and second plane was marked by joining the most superior and most inferior point on the glenoid fossa curvature...
November 1, 2018: Journal of Contemporary Dental Practice
Benjamin Bockmann, Martin Bäumlein, Rainer Koch, Jens Figiel, Philipp Lechler, René Aigner, Christopher Bliemel, Ludwig Oberkircher, Steffen Ruchholtz, Michael Frink
INTRODUCTION: Cuff tear arthritis and complex proximal humeral fractures are common pathologies that are frequently addressed by the implantation of a reversed shoulder prosthesis. The present cadaveric study aimed to analyze the effect of cement augmentation of the glenoid component on the primary stability in geriatric patients. HYPOTHESIS: Cement augmentation of glenoid baseplate screws has an influence on primary stability in reversed shoulder arthroplasty (RSA)...
December 20, 2018: Orthopaedics & Traumatology, Surgery & Research: OTSR
Wataru Sahara, Takaharu Yamazaki, Shoji Konda, Kazuomi Sugamoto, Hideki Yoshikawa
BACKGROUND: Although the elevation angle of the arm affects the range of rotation, it has not been evaluated up to the maximal abduction angle. In this study we conducted an evaluation up to maximal abduction and determined the contact patterns at the glenohumeral (GH) joint. METHODS: Fourteen healthy volunteers (12 men and 2 women; mean age, 26.9 years) with normal shoulders (14 right and 8 left) were instructed to rotate their shoulders at 0°, 90°, 135°, and maximal abduction for each shoulder at a time...
December 17, 2018: Journal of Shoulder and Elbow Surgery
Jianqiao Hong, Yiting Huang, Chiyuan Ma, Guoxin Qu, Jiahong Meng, Haobo Wu, Mingmin Shi, Yangxin Wang, Chenhe Zhou, Zexin Chen, Shigui Yan, Wei Wang
BACKGROUND: Anatomic skeletal features of the shoulder play important roles in anterior shoulder dislocation. However, studies on the effect of the humeral structure are few. This case-control study aimed to analyze the risk factors of anterior shoulder instability, including glenoid and humeral factors. METHODS: Anterior shoulder instability was found in 64 of 10,035 individuals who underwent magnetic resonance imaging. Propensity score matching was used to select controls matched for age, sex, height, and weight...
November 30, 2018: Journal of Shoulder and Elbow Surgery
Tiffany S Lung, David Cruickshank, Heather J Grant, Michael J Rainbow, Timothy J Bryant, Ryan T Bicknell
BACKGROUND: Reverse shoulder arthroplasty (RSA) is typically performed in patients with cuff tear arthropathy. A common type of RSA baseplate has a central peg and 4 peripheral screws inserting into the glenoid surface. Baseplate failure is a significant postoperative complication that reduces prosthetic longevity and usually requires revision surgery. This study evaluated the contribution of mechanical factors on initial baseplate fixation. MATERIALS AND METHODS: This study simulated glenoid baseplate loading in a RSA...
November 30, 2018: Journal of Shoulder and Elbow Surgery
Sung-Min Rhee, Jung Youn Kim, Jae Yoon Kim, Seong Jin Cho, Jae Hyung Kim, Yong Girl Rhee
HYPOTHESIS: We hypothesized that a new method considering the humeral head would distinguish rotator cuff tears (RCTs) and osteoarthritis (OA) better than the critical shoulder angle (CSA). METHODS: A total of 1011 patients were tested in this study and divided into 4 groups: those with RCTs (n = 493), those with OA (n = 73), those with anterior instability (n = 361), and those with adhesive capsulitis (n = 84). The CSA and new radiologic parameters including the humeral head were measured in the true anterior-to-posterior view: the Y angle connecting the lower end of the glenoid (LG), the center of the humeral head (CH), and the upper end of the glenoid (UG); the G angle connecting UG, CH, and the lateral tip of the acromion; the YG angle connecting LG, CH, and the lateral tip of the acromion; and the R angle connecting UG, LG, and CH...
April 2019: Journal of Shoulder and Elbow Surgery
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