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https://www.readbyqxmd.com/read/28792929/new-gliding-mammaliaforms-from-the-jurassic
#1
Qing-Jin Meng, David M Grossnickle, Di Liu, Yu-Guang Zhang, April I Neander, Qiang Ji, Zhe-Xi Luo
Stem mammaliaforms are Mesozoic forerunners to mammals, and they offer critical evidence for the anatomical evolution and ecological diversification during the earliest mammalian history. Two new eleutherodonts from the Late Jurassic period have skin membranes and skeletal features that are adapted for gliding. Characteristics of their digits provide evidence of roosting behaviour, as in dermopterans and bats, and their feet have a calcaneal calcar to support the uropagatium as in bats. The new volant taxa are phylogenetically nested with arboreal eleutherodonts...
August 9, 2017: Nature
https://www.readbyqxmd.com/read/28777666/shoulder-bone-geometry-affects-the-active-and-passive-axial-rotational-range-of-the-glenohumeral-joint
#2
Alexander Humphries, Srdjan Cirovic, Aliah F Shaheen
BACKGROUND: The range of motion of the glenohumeral joint varies substantially among individuals and is dependent on humeral position. How variation in shape of the humerus and scapula affects shoulder axial range of motion at various positions has not been established. PURPOSE: To quantify variation in the shape of the glenohumeral joint and investigate whether the scapula and humerus geometries affect the axial rotational range of the glenohumeral joint. STUDY DESIGN: Descriptive laboratory study...
August 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28750960/the-effects-of-opposite-directional-static-contraction-of-the-muscles-of-the-right-upper-extremity-on-the-ipsilateral-right-soleus-h-reflex
#3
Tomoko Shiratani, Mitsuo Arai, Hironobu Kuruma, Kazue Masumoto
The objective of this study was to explore the neurophysiological remote after-effects of resistive static contraction (SC) of the muscles of the upper extremity, considering the resistant direction on the ipsilateral (right) soleus H-reflex. The participants included 12 normal subjects with a mean (SD) age of 23.8 (2.8) years. The subjects were asked to maintain their upper extremity against the traction force, at a level of resistance that was 50% of the maximal SC strength. A 20-s SC of the muscles of the upper extremity utilizing contraction of the upper extremity muscles using a diagonal flexion (shoulder flexion-adduction-external rotation) or extension (shoulder extension-abduction-internal rotation), a proprioceptive neuromuscular facilitation (PNF) pattern was induced...
July 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28739300/the-critical-shoulder-angle-is-associated-with-osteoarthritis-in-the-shoulder-but-not-rotator-cuff-tears-a-retrospective-case-control-study
#4
Arnar O Bjarnison, Thomas J Sørensen, Thomas Kallemose, Kristoffer W Barfod
BACKGROUND: In 2013 Moor et al introduced the concept of the critical shoulder angle (CSA) and suggested that an abnormal CSA was a leading factor in development of rotator cuff tear (RCT) and osteoarthritis (OA) of the shoulder. This study assessed whether the CSA was associated with RCT and OA and tested the inter- and intrarater reliability of the CSA when measuring RCT and OA. MATERIALS AND METHODS: The study was performed as a retrospective case-control study...
July 21, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28735412/variability-in-attachment-of-the-coracoacromial-ligament-in-relation-with-its-morphology
#5
Abdulrahman Alraddadi, Abduelmenem Alashkham, Clare Lamb, Roger Soames
PURPOSE: The coracoacromial ligament (CAL) presents with variable morphology and plays a significant role in the development of subacromial impingement syndrome. Sectioning the CAL has been suggested to relieve impingement of the rotator cuff. The aim of the current study was to investigate the CAL attachment in relation with ligament morphology. MATERIALS AND METHODS: The CAL was investigated in 220 cadaveric shoulders from 58 males and 59 females, with a median age of 82 years (range 53-102 years)...
July 22, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28707116/rotator-cuff-degeneration-of-the-healthy-shoulder-in-patients-with-unilateral-arm-amputation-is-not-worsened-by-overuse
#6
S Gumina, V Candela, L Mariani, T Venditto, C Catalano, S Castellano, V Santilli, G Giannicola, A Castagna
PURPOSE: In order to evaluate whether overuse has a significant role in rotator cuff tear (RCT) aetiology, we evaluated both shoulders of patients with old unilateral arm amputation expecting a higher rate of RC degeneration in the healthy side. METHODS: Nineteen males and six females (mean age: 57.3 ± 10.1) with an old (>20 years) unilateral arm amputation were submitted to an MRI of both shoulders. Tendon status and muscle tropism were evaluated according to Sugaya and Fuchs classifications, respectively; the acromion humeral distance was measured...
July 13, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28687304/superior-shoulder-suspensory-complex-fracture-dislocation-case-report
#7
T Lidgett, E Bate, L Pittock
BACKGROUND: Acromioclavicular joint dislocation can be more complex than it first appears. The presented case had an unusual combination of injuries to the superior shoulder suspensory complex, which yielded some interesting learning points. CASE SUMMARY: The injuries were sustained after a fall from a push bike and included acromioclavicular dislocation with coracoid process, clavicle and acromion process fractures. These were identified on the initial X-ray examination, which was followed by computed tomography for surgical planning...
August 2017: Radiography
https://www.readbyqxmd.com/read/28643366/inter-rater-reliability-of-ultrasound-measurements-of-acromion-greater-tuberosity-distance-between-experienced-and-novice-raters-in-healthy-people
#8
Praveen Kumar, Matthew Attwood
No abstract text is available yet for this article.
June 23, 2017: Musculoskeletal Care
https://www.readbyqxmd.com/read/28634924/chondroblastoma-in-adult-age
#9
Andrea Angelini, Mohammad Hassani, Andreas F Mavrogenis, Giulia Trovarelli, Carlo Romagnoli, Antonio Berizzi, Pietro Ruggieri
PURPOSE: Chondroblastoma (CB) is a rare benign tumor that occurs most commonly in the second decade of life. No studies on CB in adulthood have been reported. Our purposes were to report a single-institution experience on CB in adults and to discuss the clinical and imaging findings, type of treatment, oncologic and functional outcomes. PATIENTS AND METHODS: All patients diagnosed and treated for CB from 1981 to 2014 were reviewed. The main inclusion criterion was patients above their 30 years of age at diagnosis...
August 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/28630752/acromion-and-glenoid-shape-why-are-they-important-predictive-factors-for-the-future-of-our-shoulders
#10
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/28619059/critical-shoulder-angle-combined-with-age-predict-five-shoulder-pathologies-a-retrospective-analysis-of-1000-cases
#11
Philipp R Heuberer, Fabian Plachel, Lukas Willinger, Philipp Moroder, Brenda Laky, Leo Pauzenberger, Fritz Lomoschitz, Werner Anderl
BACKGROUND: Acromial morphology has previously been defined as a risk factor for some shoulder pathologies. Yet, study results are inconclusive and not all major shoulder diseases have been sufficiently investigated. Thus, the aim of the present study was to analyze predictive value of three radiological parameters including the critical shoulder angle, acromion index, and lateral acromion angle in relationship to symptomatic patients with either cuff tear arthropathy, glenohumeral osteoarthritis, rotator cuff tear, impingement, and tendinitis calcarea...
June 15, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28609319/comparing-corticosteroid-preparation-and-dose-in-the-improvement-of-shoulder-function-and-pain-a-randomized-single-blind-pilot-study
#12
Matthew B Carroll, Spencer A Motley, Benjamin Smith, Bryan C Ramsey, Alan S Baggett
INTRODUCTION: Shoulder pain may arise from inflammation of the bursa separating the supraspinatus tendon from the coracoacromial ligament and acromion. The optimal treatment dose and preparation of intrabursal corticosteroid injection are unknown. METHODS: This single-blinded equivalence study recruited 62 subjects randomizing them to one of following four arms: methylprednisolone 20 mg, methylprednisolone 40 mg, triamcinolone acetonide 20 mg, or triamcinolone acetonide 40 mg...
June 12, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28604191/establishing-a-new-appropriate-intramuscular-injection-site-in-the-deltoid-muscle
#13
Yukari Nakajima, Kanae Mukai, Kana Takaoka, Toshiko Hirose, Keiko Morishita, Takuya Yamamoto, Yuka Yoshida, Tamae Urai, Toshio Nakatani
It is becoming increasingly important for clinicians to identify a safer intramuscular (IM) injection site in the deltoid muscle because of possible complications following the vaccine administration of IM injections. We herein examined 4 original IM sites located on the perpendicular line through the mid-acromion to establish a safer IM injection site. Thirty healthy volunteers participated in this study and the distances from our 4 IM sites to some anatomical landmarks on their left arms were measured. Ultrasonography (US) was also performed to measure the thickness of the deltoid muscle and identify the posterior circumflex humeral artery (PCHA) along the course of the axillary nerve...
June 12, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28588662/management-of-painful-reverse-shoulder-arthroplasty
#14
REVIEW
Anders L Ekelund
Even though reverse shoulder arthroplasty is a very successful procedure, painful complications occur. During the initial postoperative years, the most common reasons for pain are instability, postoperative fracture of the acromion or spine, and periprosthetic infection. Later, aseptic loosening, with humeral loosening being more frequent that glenoid loosening, can be a source of pain and reduction in function. A careful patient history, clinical examination, plain radiographs, computed tomography and blood tests give an explanation for the pain in most cases...
July 2017: Shoulder & Elbow
https://www.readbyqxmd.com/read/28567226/acromion-index-in-korean-population-and-its-relationship-with-rotator-cuff-tears
#15
Dong Ho Kum, Jun Ho Kim, Keun Min Park, Eun Su Lee, Yong Bok Park, Jae Chul Yoo
BACKGROUND: Among the many causes of rotator cuff tears, scapular morphology is associated with the accelerating degenerative process of the rotator cuff. Acromion index (AI) was previously introduced and compared in two populations. METHODS: We enrolled 100 Korean patients diagnosed with full-thickness rotator cuff tears by magnetic resonance imaging and intraoperative arthroscopic findings between January and December 2013. Another 100 Korean patients with an intact rotator cuff tendon identified on magnetic resonance imaging and other shoulder diseases, such as frozen shoulder and instability, were enrolled as controls...
June 2017: Clinics in Orthopedic Surgery
https://www.readbyqxmd.com/read/28530477/reliability-and-validity-of-an-acromion-marker-cluster-for-recording-scapula-posture-at-end-range-clavicle-protraction-retraction-elevation-and-depression
#16
Yaheli Bet-Or, Wolbert van den Hoorn, Venerina Johnston, Shaun P O'Leary
Acromion Marker Cluster (AMC) methods have been shown to accurately track scapula motion during humeral elevation below 90°, however, their accuracy has not been assessed in shoulder girdle motion such as clavicle protraction, retraction, elevation and depression independent of humeral movement. The aim of this study was to examine the reliability and validity of the AMC method to record scapula orientation at end range clavicle protraction, retraction, elevation and depression. The right scapulae of twenty-two female and twenty male asymptomatic volunteers were assessed with an AMC and Scapula Locator (SL) method during end range clavicle protraction, retraction, elevation and depression (without humeral elevation) using an eight-camera 3D movement registration system...
May 22, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28507874/a-10-year-follow-up-of-a-free-vascularized-fibula-flap-clavicle-reconstruction-in-an-adult
#17
Louie Ye, G Ian Taylor
The free vascularized fibula flap has been widely used for clavicle reconstruction. Limited evidence exists for the long-term outcome of clavicle reconstruction using the free vascularized fibula flap in adults. We report the functional and aesthetic outcome in a 52-year old man a decade after clavicle reconstruction using a free vascularized fibula flap in combination with a modified Richardson Hook Plate. At the 10-year follow-up, panoramic shoulder X-ray showed the modified Richardson Hook Plate had remained firmly in place with the fibula and the hook positioned beneath the acromion...
April 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28483432/reverse-shoulder-arthroplasty-in-patients-with-os-acromiale
#18
William R Aibinder, Bradley S Schoch, Robert H Cofield, John W Sperling, Joaquin Sánchez-Sotelo
BACKGROUND: Os acromiale has been reported in up to 15% of the general population. Reverse total shoulder arthroplasty (RTSA) increases deltoid tension, which could potentially lead to excessive stress on a pre-existent os acromiale. The purpose of this study was to determine the outcome and complications of primary RTSA in patients with radiographic evidence of an os acromiale. METHODS: Between 2005 and 2013, 25 shoulders underwent primary RTSA with an associated os acromiale, which was classified preacromion (3), mesoacromion (20), and meta-acromion (2)...
May 5, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28451621/is-there-an-association-between-the-critical-shoulder-angle-and-clinical-outcome-after-rotator-cuff-repair
#19
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/28436372/unusual-location-of-osteoid-osteoma-in-the-acromion
#20
Łukasz Chojecki, Janusz Płomiński, Artur Pepłoński
We present the clinical case of a 14-year-old female patient complaining of omalgia. A focus of osteoid osteoma located in the acromion was diagnosed. The lesion was removed using the arthroscopic technique, and the symptoms subsided completely. We also present a review of published papers regarding unusual locations of osteoid osteoma.
January 26, 2017: Ortopedia, Traumatologia, Rehabilitacja
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