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Jia-Hua Lin, Xu Xu
Cranking the landing gear is a common task performed by truck drivers to raise or lower trailers. This task poses a risk to the shoulder joint due to the required forceful exertion and the posture constrained to the hand-handle interface. As a potential occupational risk, there has been no definitive guideline for best practices among truck drivers. An operator can crank perpendicular (frontal) or parallel (sagittal) to the crank rotation. In this laboratory study, the effects of cranking method and resistance on scapular range of motion and shoulder muscle activity were observed in 12 participants...
February 2019: Applied Ergonomics
Redouane Kadi, Annemieke Milants, Maryam Shahabpour
The shoulder joint is functionally and structurally complex and is composed of bone, hyaline cartilage, labrum, ligaments, capsule, tendons and muscles. It links the trunk to the upper limb and plays an important biomechanical role in daily activities. Indications for imaging of the shoulder have considerably increased in the last few years. The article focuses mainly on Magnetic Resonance Imaging (MRI) as well as MR and CT arthrography, diagnostic procedures of choice for assessment of internal derangement of the shoulder...
December 16, 2017: Journal of the Belgian Society of Radiology
Jieun Kwon, Sae Hoon Kim, Ye Hyun Lee, Tae In Kim, Joo Han Oh
BACKGROUND: Scoring systems integrating possible prognostic factors and predicting rotator cuff healing after surgical repair could provide valuable information for clinical practice. PURPOSE: To determine the prognostic factors predictive of rotator cuff healing after surgical repair and to integrate these factors into a scoring system. STUDY DESIGN: Case-control study; Level of evidence, 3. METHODS: The authors reviewed the records of 603 patients who, at least 12 months after primary rotator cuff repair by a single surgeon, had magnetic resonance imaging or computed tomographic arthrography to assess repair integrity...
November 28, 2018: American Journal of Sports Medicine
Greg D Learn, Phillip E McClellan, Derrick M Knapik, Jameson L Cumsky, Victoria Webster-Wood, James M Anderson, Robert J Gillespie, Ozan Akkus
Despite advancements in surgical techniques and materials for rotator cuff repair procedures, primary repair failures remain common. This study examines the use of electrochemically aligned collagen (ELAC) threads woven into biotextile scaffolds as grafts to repair critical infraspinatus tendon defects in New Zealand White rabbits. Three surgical treatment groups were evaluated: rabbits undergoing direct repair as operative controls, rabbits receiving ELAC scaffolds alone, and rabbits treated with mesenchymal stem cell (MSC)-seeded ELAC scaffolds...
November 28, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Shin Yokoya, Yoshihiro Nakamura, Yohei Harada, Mitsuo Ochi, Nobuo Adachi
BACKGROUND: We performed arthroscopic rotator cuff repair (ARCR) combined with miniopen supraspinatus and infraspinatus muscle advancement for massive rotator cuff tears (RCTs) to decrease tension at the repair site with the goal of reduction of the failure rate. We evaluated the clinical outcomes and failure rate after this procedure. METHODS: This study included 47 patients diagnosed with chronic massive RCTs between October 2010 and March 2015. Of these patients, 21 underwent transosseous equivalent (TOE) ARCR only (control group), and 26 underwent TOE ARCR with muscle advancement (study group)...
November 20, 2018: Journal of Shoulder and Elbow Surgery
Elda A Treviño, Jennifer McFaline-Figueroa, Robert E Guldberg, Manu O Platt, Johnna S Temenoff
The etiology of joint tissue degeneration following rotator cuff tear remains unclear. Thus, the purpose of this study was to understand the timeline of protease activity in the soft tissues of the shoulder (tendon, muscle, and cartilage) that may lead to down-stream degeneration following rotator cuff tear. A well-established rat model involving suprascapular nerve denervation and supraspinatus/infraspinatus tendon transection was employed. Histological staining and/or micro-computed tomography (µCT) were used to observe structural damage in the supraspinatus tendon and muscle, humeral head cartilage, and subchondral bone...
November 20, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
Qian Liu, Yinxian Yu, Ramona L Reisdorf, Jun Qi, Chun-Kuan Lu, Lawrence J Berglund, Peter C Amadio, Steven L Moran, Scott P Steinmann, Kai-Nan An, Anne Gingery, Chunfeng Zhao
Reducing rotator cuff failure after repair remains a challenge due to suboptimal tendon-to-bone healing. In this study we report a novel biomaterial with engineered tendon-fibrocartilage-bone composite (TFBC) and bone marrow-derived mesenchymal stem cell sheet (BMSCS); this construct was tested for augmentation of rotator cuff repair using a canine non-weight-bearing (NWB) model. A total of 42 mixed-breed dogs were randomly allocated to 3 groups (n = 14 each). Unilateral infraspinatus tendon underwent suture repair only (control); augmentation with engineered TFBC alone (TFBC), or augmentation with engineered TFBC and BMSCS (TFBC + BMSCS)...
October 29, 2018: Biomaterials
Zachary A Cupler, Michael T Anderson, Eric T Stefanowicz, Chad D Warshel
Background: Vertebral osteomyelitis is a rare, life-threatening condition. Successful management is dependent on prompt diagnosis and management with intravenous antibiotic therapy or surgery in addition to antibiotics. Reoccurrence is minimal after 1 year. However, very little is reported in the conservative spine literature regarding the long-term follow-up and the changes to the spine following management of the spinal infection. We report the dramatic radiologic findings of the long-term sequela of a cervical spine infection following a gunshot wound from 1969...
2018: Chiropractic & Manual Therapies
Masao Koda, Yuki Hara, Eriko Okano, Tetsuya Abe, Toru Funayama, Hiroshi Noguchi, Kousei Miura, Katsuya Nagashima, Hiroshi Kumagai, Kentaro Mataki, Masashi Yamazaki
We report an extremely rare case showing a fifth cervical spine (C5) level pure motor cervical spinal cord injury (SCI). A 55-year-old-man lost consciousness and fell into a bathtub. Immediately after regaining consciousness, the patient had right arm drop alone. He was referred to our department for investigation of right arm drop 4 months later. Neurological examination revealed motor weakness of the right deltoid muscle. MRI of the cervical spine revealed a C3-4 level central disc herniation compressing the spinal cord...
November 15, 2018: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
Naoyuki Ochiai, Yukei Matsumoto, Yuki Hara, Yasumasa Nishiura, Shinji Murai
BACKGROUND: In infant poliomyelitis or poliomyelitis-like paresis, there has been no means of treating residual paralysis and the policy has been to wait until an affected infant has grown sufficiently to enable tendon transfer or arthrodesis. However, recent reports have described relatively good results for early surgical intervention in the form of nerve transfer. METHODS: In a 4-year and 6-month-old child we transferred a partial ulnar nerve for elbow flexor reconstruction even 3 years and 10 months after the onset of poliomyelitis-like palsy and also transferred partial accessory and radial nerves for shoulder function restoration 6 months after the first operation...
November 10, 2018: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
Mengcun Chen, Snehal S Shetye, Julianne Huegel, Corinne N Riggin, Daniel J Gittings, Courtney A Nuss, Stephanie N Weiss, Andrew F Kuntz, Louis J Soslowsky
BACKGROUND: Lesions of the long head of the biceps tendon are often associated with massive rotator cuff tears (MRCTs), and biceps tenotomy is frequently performed for pain relief and functional reservation. However, the efficacy and safety of biceps tenotomy regarding the effects on the surrounding tissues in chronic MRCT are unclear. HYPOTHESIS: Biceps tenotomy would result in improved mechanical and histological properties of the intact subscapularis tendon and improved in vivo shoulder function while not compromising glenoid cartilage properties...
December 2018: American Journal of Sports Medicine
Shirley S Fong, Leanne L Ng, Ada W Ma, Hsing-Kuo Wang, Young-Hyeon Bae, Timothy T Yam, W K Kam, Joanne W Chung
BACKGROUND: This study aimed to examine the influence of kinesiology taping (KT), various overhead stroke techniques, and their interactions on shoulder girdle muscle activity and on sports performance in badminton players with shoulder impingement syndrome. METHODS: Twenty-five amateur badminton players with shoulder impingement syndrome participated in the study. Each was exposed to two KT conditions (no taping and taping) while performing four badminton strokes (defensive clear, attacking clear, smash, and drop shot) in a random order...
October 31, 2018: Journal of Sports Medicine and Physical Fitness
Freya Hik, David C Ackland
The moment arm of a muscle represents its leverage or torque-producing capacity, and is indicative of the role of the muscle in joint actuation. The objective of this study was to undertake a systematic review of the moment arms of the major muscles spanning the glenohumeral joint during abduction, flexion and axial rotation. Moment arm data for the deltoid, pectoralis major, latissimus dorsi, teres major, supraspinatus, infraspinatus, subscapularis and teres minor were reported when measured using the geometric and tendon excursion methods...
November 8, 2018: Journal of Anatomy
René B K Brund, Sten Rasmussen, Uwe G Kersting, Lars Arendt-Nielsen, Thorvaldur Skuli Palsson
Background and aims Achilles tendinopathy is common among runners, but the etiology remains unclear. High mechanical pain sensitivity may be a predictor of increased risk of developing Achilles tendinopathy in this group. The purpose of this study was to investigate whether local pain sensitivity could predict the development of Achilles tendinopathy in recreational male runners. The overall hypothesis was that high pain sensitivity would be related to a higher risk of developing Achilles tendinopathy among recreational male runners...
November 8, 2018: Scandinavian Journal of Pain
Wei-Ting Wu, Ke-Vin Chang, Kamal Mezian, Ondřej Naňka, Chih-Peng Lin, Levent Özçakar
As changes in nerves' shape and size are common ultrasonographic findings of entrapment neuropathy, measurement of the nerve cross-sectional area (CSA) becomes the mostly used indicator to differentiate normality from pathology. Recently, more US research has been conducted to measure the shape of the suprascapular notch and the diameter of the suprascapular nerve. Because the suprascapular nerve is paramount for various shoulder disorders, the present study aims to establish normal values of suprascapular nerve sizes at different levels as well as to investigate potential influence of participants' characteristics on the CSA measurements...
2018: Frontiers in Neurology
Philippe Collin, Michel Colmar, Hervé Thomazeau, Pierre Mansat, Pascal Boileau, Philippe Valenti, Mo Saffarini, Luca Nover, Jean-François Kempf
BACKGROUND: Massive rotator cuff tears are challenging to treat, with few or no studies on long-term outcomes of repair. The purpose of this study was to report 10-year outcomes following repair of massive posterosuperior rotator cuff tears, with and without extension into the subscapularis, and to determine prognostic factors that could influence clinical scores and retear rates. METHODS: The records of 234 patients who underwent repair of a massive posterosuperior rotator cuff tear at a total of 15 centers were retrieved...
November 7, 2018: Journal of Bone and Joint Surgery. American Volume
Stephen S Burkhart, Robert U Hartzler
PURPOSE: The purpose of the study was to investigate the rate and magnitude of return of active forward elevation (aFE) of the arm for patients with severe preoperative elevation dysfunction (less than 45° of aFE and termed profound pseudoparalysis) and massive, irreparable (or partially reparable) rotator cuff tears without arthritis treated with arthroscopic superior capsular reconstruction (SCR). METHODS: The period for this retrospective study was October 2014 to October 2016...
October 30, 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
Kjersti Kaul Jenssen, Kirsten Lundgreen, Jan Erik Madsen, Rune Kvakestad, Sigbjørn Dimmen
BACKGROUND: Although shoulder function is reported to be generally good after rotator cuff repair, limited knowledge exists regarding which prognostic factors predict functional outcomes. PURPOSE: To identify pre- and perioperative predictors of functional outcomes after arthroscopic rotator cuff repair. STUDY DESIGN: Case-control study; Level of evidence, 3. METHODS: A cohort of 733 consecutive patients treated with rotator cuff repair between 2010 and 2014 in a single orthopaedics unit was included...
December 2018: American Journal of Sports Medicine
S Ebert-Fillmer, U T Bloos, S El Masri, R Stangl
OBJECTIVE: Is transfer of the latissimus dorsi muscle (LDT) a good option in older patients with irreparable posterosuperior rotator cuff tears? MATERIAL AND METHOD: In 2010-2016 a total of 25 patients without glenohumeral arthritis and non-reconstructable supraspinatus and infraspinatus tendons, a recentered glenohumeral joint with remaining function in anteversion and irreparable posterosuperior rotator cuff defects were treated using LDT at the Rummelsberg Hospital...
October 31, 2018: Der Unfallchirurg
Chayanit Sasiponganan, Riham Dessouky, Oganes Ashikyan, Parham Pezeshk, Christopher McCrum, Yin Xi, Avneesh Chhabra
OBJECTIVE: To evaluate the relationships between acromial anatomy and developmental alterations with rotator cuff tears in female patients and compare these parameters on radiographs and corresponding MRIs along with inter-reader performance. MATERIALS AND METHODS: Patient demographics, symptoms, and acromial characteristics on radiograph (acromial index, lateral acromion angle, subacromial space on AP and Y- views, acromial anterior and lateral downsloping) and MRI (shape, slope, spur, osteoarthrosis, os acromiale) were recorded...
October 27, 2018: Skeletal Radiology
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