Read by QxMD icon Read

Joint stability

Saverio Affatato, Alessandro Ruggiero, Sami Abdel Jaber, Massimiliano Merola, Pierangiola Bracco
Given the long-term problem of polyethylene wear, medical interest in the new improved cross-linked polyethylene (XLPE), with or without the adding of vitamin E, has risen. The main aim of this study is to gain further insights into the mutual effects of radiation cross-linking and addition of vitamin E on the wear performance of ultra-high-molecular-weight polyethylene (UHMWPE). We tested four different batches of polyethylene (namely, a standard one, a vitamin E-stabilized, and two cross-linked) in a hip joint simulator for five million cycles where bovine calf serum was used as lubricant...
March 16, 2018: Materials
Joshua M Peterson, Carolyn Chlebek, Ashley M Clough, Alexandra K Wells, Eric H Ledet
STUDY DESIGN: In vitro biomechanical testing of human cadaveric cervical and goat cervical motion segments. OBJECTIVE: To measure the effects of plate stiffness on load-sharing, instantaneous axis of rotation (IAR), and posterior element loading after anterior cervical discectomy and fusion (ACDF). SUMMARY OF BACKGROUND DATA: ACDF is intended to create an environment which facilitates sufficient stability and biomechanical conditions to promote bone formation...
March 15, 2018: Spine
Yan Zheng, Tetsuro Muraoka, Kento Nakagawa, Kouki Kato, Kazuyuki Kanosue
The relative-salience hypothesis has been proposed as a possible explanation for the stability of bimanual coordination. This explanation proceeds from a psychological viewpoint and is based on the following tenets: (1) cyclic joint motions involving two movements are conceived of as a unified event, (2) if a "single" point in each movement is seen as the most salient, the salient points of the two movements prefer to go together, and (3) in other cases, a unified event will be constrained by movement direction...
March 15, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
R Miller, K Schmidt, C Kirschbaum, S Enge
The internet-based assessment of response time (RT) and error rate (ERR) has recently become a well-validated alternative to traditional laboratory-based assessment, because methodological research has provided evidence for negligible setting- and setup-related differences in RT and ERR measures of central tendency. However, corresponding data on potential differences in the variability of such performance measures are still lacking, to date. Hence, the aim of this study was to conduct internet-based mental chronometry in both poorly standardized domestic and highly standardized laboratory environments and to compare the variabilities of the corresponding performance measures...
March 15, 2018: Behavior Research Methods
Kazuhisa Matsui, Takashi Tachibana, Katsuya Nobuhara, Yasushi Uchiyama
BACKGROUND: The glenohumeral joint is subjected to opposing forces when the direction of shoulder motion is changed, accelerating and decelerating to make the movements. The influence of motion velocity or acceleration on translation of the humeral head has not been evaluated although direction and distance of humeral head translation has been analyzed in real time in normal shoulders. We hypothesized that, in a normal shoulder, the humeral head does not deviate significantly or suddenly during active shoulder rotation regardless of motion velocity...
March 15, 2018: Journal of Experimental Orthopaedics
Muhammad Abid, Shafaqat Ali, Lei Kang Qi, Rizwan Zahoor, Zhongwei Tian, Dong Jiang, John L Snider, Tingbo Dai
Defining the metabolic strategies used by wheat to tolerate and recover from drought events will be important for ensuring yield stability in the future, but studies addressing this critical research topic are limited. To this end, the current study quantified the physiological, biochemical, and agronomic responses of a drought tolerant and drought sensitive cultivar to periods of water deficit and recovery. Drought stress caused a reversible decline in leaf water relations, membrane stability, and photosynthetic activity, leading to increased reactive oxygen species (ROS) generation, lipid peroxidation and membrane injury...
March 15, 2018: Scientific Reports
Chris Brogden, Kelly Marrin, Richard Page, Matt Greig
CONTEXT: Clinical and functional assessments are performed regularly in sporting environments to screen for performance deficits and injury risk. Circadian rhythms have been demonstrated to affect human performance, however the influence of time of day on a battery of multiple ankle injury risk factors has yet to be established within athletic populations. OBJECTIVES: To investigate the influence of circadian variation on a battery of tests, used to screen for ankle aetiological risk factors...
March 15, 2018: Journal of Sport Rehabilitation
JongEun Yim, Jerrold Petrofsky, Haneul Lee
Ankle and foot injuries are common among athletes and physically active individuals. The most common residual disability, ankle sprain, is characterized by instability along with postural sway. If the supporting structures around a joint become lax, posture stability and balance are also affected. Previous studies have examined muscle stiffness and elasticity and postural sway separately; however, the relationship between these factors is yet unknown. It is well known that the levels of sex hormones, especially estrogen, change in women over the phase of the menstrual cycle...
2018: Tohoku Journal of Experimental Medicine
Yuji Tomori, Takuya Sawaizumi, Mitsuhiko Nanno, Shinro Takai
The Sauvé-Kapandji procedure is a reliable option for patients with various disorders of the distal radioulnar joint (DRUJ). However, postoperative pain over the proximal ulnar stump frequently develops during forearm rotation or when lifting heavy objects, although many clinically satisfactory results have been reported. This stump pain has been suggested to result from dynamic instability of the proximal ulnar stump. Several types of tenodesis have recently been performed simultaneously with the Sauvé-Kapandji procedure to stabilize the proximal ulnar stump and thus relieve the associated pain...
March 2018: Medicine (Baltimore)
Christopher Nacca, Joseph A Gil, Rohit Badida, Joseph J Crisco, Brett D Owens
BACKGROUND: There is currently no consensus regarding the amount of posterior glenoid bone loss that is considered critical. Critical bone loss is defined as the amount of bone loss that occurs in which an isolated labral repair will not sufficiently restore stability. PURPOSE: The purpose is to identify the critical size of the posterior defect. STUDY DESIGN: Controlled laboratory study. METHODS: Eleven cadaveric shoulders were tested...
March 1, 2018: American Journal of Sports Medicine
Diego Hojsgaard
Polyploid genomes evolve and follow a series of dynamic transfigurations along with adaptation and speciation. The initial formation of a new polyploid individual within a diploid population usually involves a triploid bridge, a two-step mechanism of cell fusions between ubiquitous (reduced) and rare (unreduced) gametes. The primary fusion event creates an intermediate triploid individual with unbalanced genome sets, a situation of genomic-shock characterized by gene expression dysregulation, high dosage sensitivity, disturbed cell divisions, and physiological and reproductive attributes drastically altered...
2018: Frontiers in Plant Science
Seynabou Séne, Marc-André Selosse, Mathieu Forget, Josie Lambourdière, Khoudia Cissé, Abdala Gamby Diédhiou, Elsie Rivera-Ocasio, Hippolyte Kodja, Norikazu Kameyama, Kazuhide Nara, Lucie Vincenot, Jean-Louis Mansot, Jean Weber, Mélanie Roy, Samba Ndao Sylla, Amadou Bâ
Global trade increases plant introductions, but joint introduction of associated microbes is overlooked. We analyzed the ectomycorrhizal fungi of a Caribbean beach tree, seagrape (Coccoloba uvifera, Polygonacaeae), introduced pantropically to stabilize coastal soils and produce edible fruits. Seagrape displays a limited symbiont diversity in the Caribbean. In five regions of introduction (Brazil, Japan, Malaysia, Réunion and Senegal), molecular barcoding showed that seagrape mostly or exclusively associates with Scleroderma species (Basidiomycota) that were hitherto only known from Caribbean seagrape stands...
March 13, 2018: ISME Journal
Ji-Hui Zhang, Liu-Jun Zhao
Instability of the cervical spine disease requires surgery to restore stability. In the past, surgical methods were divided into two kinds of anterior and posterior. But each has its own disadvantages:anterior vertebral screw has a higher failure rate, sometimes need a second operation; and posterior pedicle screw, lateral mass screw and facet joint screw may make greater trauma, lead to longer hospitalization. For general instable cervical spine disease, according to the location of the disease, only with the anterior or posterior approach can achieve a stable effect...
January 25, 2018: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
Selena Tinga, Stanley E Kim, Scott A Banks, Stephen C Jones, Brian H Park, Antonio Pozzi, Daniel D Lewis
BACKGROUND: Cranial cruciate ligament (CrCL) insufficiency is a degenerative condition that is a common cause of pelvic limb lameness and osteoarthritis in dogs. Surgical therapies developed to treat dogs with naturally occurring CrCL insufficiency aim to address the resultant instability, but the in-vivo alterations in stifle kinematics associated with CrCL insufficiency have not been accurately defined. The objective of this study was to quantify the 3-dimensional femorotibial joint kinematics of dogs with naturally occurring cranial cruciate ligament (CrCL) insufficiency during ambulation...
March 12, 2018: BMC Veterinary Research
Fabienne Marie-Louise Robertson, Ali Abdullah Mohammed, Simon Peter Frostick
INTRODUCTION: This report describes the first known sternoclavicular joint (SCJ) replacement with a custom-made prosthesis. HISTORY: A 42-year-old male who presented post left medial clavicular excision with significant pain and limited range of motion impeding his daily activities and ability to work. The patient subsequently underwent a left SCJ arthroplasty with a custom-made prosthesis. Postoperatively, the patient suffered an anterior dislocation of the prosthetic joint which was successfully rectified and stabilized with soft tissue reconstruction, creating a pseudo-capsule from adjacent tissues of the joint...
January 2018: Journal of Orthopaedic Surgery
Mohammad Kia, Timothy M Wright, Michael B Cross, David J Mayman, Andrew D Pearle, Peter K Sculco, Geoffrey H Westrich, Carl W Imhauser
BACKGROUND: The correct amount of external rotation of the femoral component during TKA is controversial because the resulting changes in biomechanical knee function associated with varying degrees of femoral component rotation are not well understood. We addressed this question using a computational model, which allowed us to isolate the biomechanical impact of geometric factors including bony shapes, location of ligament insertions, and implant size across three different knees after posterior-stabilized (PS) TKA...
January 2018: Clinical Orthopaedics and related Research
Veysel Antar, Okan Turk
OBJECTIVE: Craniovertebral junctional anomalies constitute a technical challenge. Surgical opening of atlantoaxial joint region is a complex procedure especially in patients with nuchal deformity like basilar invagination. This region has actually very complicated anatomical and functional characteristics, including multiple joints providing extension, flexion, and wide rotation. In fact, it is also a bottleneck region where bones, neural structures, and blood vessels are located. Stabilization surgery regarding this region should consider the fact that the area exposes excessive and life-long stress due to complex movements and human posture...
March 2018: Journal of Korean Neurosurgical Society
Gesa Bakker, Joerg Hattingen, Hartmut Stuetzer, Joerg Isenberg
OBJECTIVE: The diagnosis of insufficiency fractures of the sacrum in an elder population increases annually. Fractures show very different morphology. We aimed to classify sacral insufficiency fractures according to the position of cortical break and possible need for intervention. METHODS: Between January 1, 2008 and December 31, 2014, all patients with a proven fracture of the sacrum following a low-energy or an even unnoticed trauma were prospectively registered : 117 females and 13 males...
March 2018: Journal of Korean Neurosurgical Society
Lars Bischoff, Christian Babisch, Jürgen Babisch, Frank Layher, Klaus Sander, Georg Matziolis, Stefan Pietsch, Eric Röhner
INTRODUCTION: The use of Kinesio tape (KT) to improve proprioception is a matter of considerable debate. In comparison, the rupture of the anterior cruciate ligament is a sufficiently well-investigated injury with a proven compromise of proprioception. The objective of the present study was to assess a supportive effect on proprioception after KT application, taking the anterior cruciate ligament (ACL) rupture as an example. MATERIALS AND METHODS: Forty-eight patients who had suffered an ACL rupture, confirmed clinically and by magnetic resonance imaging, and who were treated conservatively or were awaiting surgery were included in this study...
March 10, 2018: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
Jin-Hyuck Lee, Jae-Won Heo, Dae-Hee Lee
BACKGROUND: Types of mechanoreceptors may differ between the medial and lateral menisci, suggesting that postural stability may differ between patients with medial and lateral meniscus tears. However, to date, postural stability has not been compared in patients with medial and lateral meniscus tears. This study used stabilometry to compare postural stability in patients with medial and lateral meniscus tears. METHODS: Postural stability and thigh muscle strength were assessed in 24 patients with medial and 18 patients with lateral meniscus tears...
March 7, 2018: Knee
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"