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https://www.readbyqxmd.com/read/29230172/sensor-motor-maps-for-describing-linear-reflex-composition-in-hopping
#1
Christian Schumacher, André Seyfarth
In human and animal motor control several sensory organs contribute to a network of sensory pathways modulating the motion depending on the task and the phase of execution to generate daily motor tasks such as locomotion. To better understand the individual and joint contribution of reflex pathways in locomotor tasks, we developed a neuromuscular model that describes hopping movements. In this model, we consider the influence of proprioceptive length (LFB), velocity (VFB) and force feedback (FFB) pathways of a leg extensor muscle on hopping stability, performance and efficiency (metabolic effort)...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/29229540/in-vivo-confirmation-of-the-reliability-of-the-dorsal-tangential-view-of-the-wrist
#2
G Kiyak
The purpose of the study was to evaluate the reliability of the dorsal tangential view (DTV) of the wrist using direct visualization of the extensor compartments in vivo. Twelve patients with extensor tendon complications [nine patients with extensor synovitis, two patients with isolated extensor pollicis longus (EPL) rupture, one patient with EPL and extensor indicis proprius rupture] after volar plating of a distal radius fracture were enrolled in the study. We obtained DTVs in the operating room before implant removal and explored the extensor compartments during synovectomy or tendon reconstruction to confirm suspected screw penetration...
December 8, 2017: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/29228408/-biomechanical-evaluation-of-rehabilitation-after-surgical-repair-of-achilles-tendon-ruptures
#3
Marlene Mauch, Markus Ulrich, Xaver Kaelin, Bernhard Segesser, Jochen Paul
Background Muscles and tendons are subjected to a high level of stress in everyday life and sports. This often leads to injuries and is associated with training failure and reduced performance as well as with high costs for treatment and rehabilitation. Fast and successful treatment is therefore very important, both from an athletic and economic point of view. This study aims to demonstrate the relevance of biomechanical procedures for the objective monitoring of rehabilitation. At the same time, the results are to be used to establish progress and evaluation criteria for an efficient and controlled rehabilitation...
December 2017: Sportverletzung Sportschaden: Organ der Gesellschaft Für Orthopädisch-Traumatologische Sportmedizin
https://www.readbyqxmd.com/read/29223409/obtaining-adequate-tension-for-extensor-hallucis-longus-tendon-rupture-repair-using-wide-awake-surgery-a-case-report
#4
Takenori Matsuda, Akira Taniguchi, Koji Hayashi, Yasuaki Nakanishi, Yasuhito Tanaka
Wide-awake surgery has potential advantages for treating extensor or flexor tendon injury. We present a case of chronic extensor hallucis longus injury treated with turn-down reconstruction using wide-awake surgery with a selective nerve block. To the best of our knowledge, this is the first such case reported. The patient had dropped a knife proximal to the right hallux metatarsophalangeal joint. Because direct suturing was thought to be difficult, turn-down reconstruction was performed under a selective nerve block...
December 7, 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29218364/ultrasound-evaluation-of-stress-injuries-and-physiological-adaptations-in-the-fingers-of-adolescent-competitive-rock-climbers
#5
Kathryn Garcia, Diego Jaramillo, Erika Rubesova
BACKGROUND: The impact of high-intensity, repetitive training on the fingers of adolescent climbers is relatively unknown. OBJECTIVE: To evaluate this effect by ultrasound (US) and to confirm some findings by magnetic resonance imaging (MRI). MATERIALS AND METHODS: The US study was performed in 20 adolescent rock climbers (ages 10-17 years) and 6 non-climbing controls (ages 11-15 years). US was used to examine the third digit of the right hand for differences in thickness of soft tissue, flexor and extensor tendon, volar plate and bony and growth plate adaptations...
December 7, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/29212436/estimation-of-individual-thigh-muscle-volumes-from-a-single-slice-muscle-cross-sectional-area-and-muscle-thickness-using-magnetic-resonance-imaging-in-patients-with-knee-osteoarthritis
#6
Koun Yamauchi, Akito Yoshiko, Shigetoshi Suzuki, Chisato Kato, Hiroshi Akima, Takayuki Kato, Koji Ishida
PURPOSE: This study aimed to identify the best single-slice anatomical muscle cross-sectional area (CSA) and muscle thickness (MT) on magnetic resonance imaging (MRI) to estimate the overall individual muscle volumes (MVs) of knee extensors and flexors in patients with knee osteoarthritis (KOA). METHODS: Twelve patients (24 legs; 4 men and 8 women) with KOA underwent a 1.5-Tesla axial MRI scan in the femoral region of interest (ROI), between the lesser trochanter and rectus femoris tendon...
September 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/29208202/-deformities-of-the-finger-joints
#7
Pernille Nygaard Vedel, Jørgen Tranum-Jensen, Lars B Dahlin, Elisabeth Brogren, Niels Henrik Søe
Extension of the fingers is a complex act. Boutonnière deformity is defined by flexion at the proximal inter-phalangeal (PIP) joint and hyperextension at the distal interphalangeal (DIP) joint due to disruption of the central slip of the extensor tendon. Swan neck deformity is defined by hyperextension at the PIP joint and flexion at the DIP joint, and the pathology is divided into intrinsic, extrinsic, and articular. The deformities are a result of imbalance of the tendons and ligaments in the fingers. Treatment is depending on the underlying cause and includes surgery and non-operative treatment...
November 27, 2017: Ugeskrift for Laeger
https://www.readbyqxmd.com/read/29200662/gearing-effects-of-the-patella-knee-extensor-muscle-sesamoid-of-the-helmeted-guineafowl-during-terrestrial-locomotion
#8
V R Allen, R E Kambic, S M Gatesy, J R Hutchinson
Human patellae (kneecaps) are thought to act as gears, altering the mechanical advantage of knee extensor muscles during running. Similar sesamoids have evolved in the knee extensor tendon independently in birds, but it is unknown if these also affect the mechanical advantage of knee extensors. Here, we examine the mechanics of the patellofemoral joint in the helmeted guineafowl Numida meleagris using a method based on muscle and tendon moment arms taken about the patella's rotation centre around the distal femur...
November 2017: Journal of Zoology: Proceedings of the Zoological Society of London
https://www.readbyqxmd.com/read/29198935/metacarpophalangeal-portal-safety-an-anatomical-study
#9
B Limousin, F Corella, B Del Campo, E Fernández, M Á Corella, T Vázquez, R Larrainzar-Garijo
AIM: To quantify the risk of dorsal innervation injury when performing direct metacarpophalangeal joint portals of the second to fifth fingers. MATERIAL AND METHOD: An anatomical study of 11 upper limbs of fresh corpses was carried out. After placing them in a traction tower, the metacarpophalangeal portals were developed on both sides of the extensor tendon. The dorsal sensory branches were dissected and the distances between the portal and the nearest nerve were measured by a digital caliper...
November 30, 2017: Revista Española de Cirugía Ortopédica y Traumatología
https://www.readbyqxmd.com/read/29189597/ultrasonic-percutaneous-tenotomy-of-common-extensor-tendons-for-recalcitrant-lateral-epicondylitis
#10
Christopher T Battista, Matthew A Dorweiler, Michael L Fisher, Bernard F Morrey, Matthew P Noyes
Tennis elbow is a common musculoskeletal condition affecting middle-aged patients with symptoms usually lasting from 6 months to 2 years. The vast majority of individuals will respond to conservative therapy; however, some will require surgical intervention. A new treatment system has been developed for use with ultrasound guidance in the ultrasonic microresection of tendinopathic tissue. This technology has been implemented in the TX1 Tissue Removal System and is used to treat various tendinopathies by debridement using targeted ultrasonic energy...
November 16, 2017: Techniques in Hand & Upper Extremity Surgery
https://www.readbyqxmd.com/read/29186946/use-of-autologous-bone-marrow-cells-concentrate-enriched-with-platelet-fibrin-on-extensor-mechanism-allograft-reconstruction-for-extensor-mechanism-failure-following-total-knee-arthroplasty
#11
S Giannotti, P D Parchi, G B Colasanti, G Agostini, F Moreschini, C Cataldi, P Ferrata, R Capanna
Allografts techniques remain the best reconstructive strategy for chronic extensor mechanism lesions after total knee arthroplasty (3) but outcomes depend strictly on the host tissue-allograft junctions healing. The purpose of this study is to evaluate if modern techniques of adding autologous bone marrow cells concentrate enriched with platelet-rich fibrin, provide better healing of the allograft. We present the case of an 86 years old patient affected by patellar tendon rupture after TKA. A whole extensor mechanism allograft was performed adding a bone marrow cells concentrate enriched with platelet-rich fibrin on the host tissue-allograft junctions...
October 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/29185351/irreducible-galeazzi-fracture-dislocations
#12
Nicholas J Yohe, Jadie De Tolla, Marc B Kaye, David M Edelstein, Jack Choueka
BACKGROUND: Fractures of the radial shaft with disruption of the distal radial ulnar joint (DRUJ) or Galeazzi fractures are treated with reduction of the radius followed by stability assessment of the DRUJ. In rare instances, the reduction of the DRUJ is blocked by interposed structures requiring open reduction of this joint. The purpose of this study is to review all cases of irreducible Galeazzi fracture-dislocations reported in the literature to offer guidelines in the diagnosis and management of this rare injury...
November 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/29185286/lessons-learned-from-imaging-on-enthesitis-in-psoriatic-arthritis
#13
REVIEW
Abdulla Watad, Iris Eshed, Dennis McGonagle
Enthesitis is a term that refers to inflammation at tendon, ligament, or joint capsule insertions. The entheses are increasinlgly considered to be the primary site of joint inflammation in the spondyloarthropathies including psoriatic arthritis (PsA). Great advances have occurred in the understanding of enthesopathy, which has resulted in a better understanding of the etiopathogenesis of PsA. Enthesitis is difficult to assess on both clinical examination and on imaging because of the overlap in features between mechanical, degenerative, and inflammatory pathologies...
November 2017: Israel Medical Association Journal: IMAJ
https://www.readbyqxmd.com/read/29163120/the-myosuit-bi-articular-anti-gravity-exosuit-that-reduces-hip-extensor-activity-in-sitting-transfers
#14
Kai Schmidt, Jaime E Duarte, Martin Grimmer, Alejandro Sancho-Puchades, Haiqi Wei, Chris S Easthope, Robert Riener
Muscle weakness-which can result from neurological injuries, genetic disorders, or typical aging-can affect a person's mobility and quality of life. For many people with muscle weakness, assistive devices provide the means to regain mobility and independence. These devices range from well-established technology, such as wheelchairs, to newer technologies, such as exoskeletons and exosuits. For assistive devices to be used in everyday life, they must provide assistance across activities of daily living (ADLs) in an unobtrusive manner...
2017: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/29159677/not-all-sagittal-band-tears-come-with-extensor-instability-a-case-report-with-radiological-and-operative-correlation
#15
Shuo Li, Jeffrey J Brooks, Jubin Jacob, Ahmadreza Ghasemiesfe, Greg B Marrinan
The sagittal bands are a component of the extensor hood. They serve an important role in stabilizing the extensor tendon by forming a "check-rein" to radial-ulnar translation of the tendon over the metacarpal head, and extending the metacarpophalangeal (MCP) joint by virtue of attaching the extensor tendon to the palmar plate. Injury to the sagittal band is thought to cause extensor instability and subluxation to the contralateral side by disruption of this "check-rein" function, although recent evidence from cadaver studies suggests that ulnar sagittal band tear may be spared of extensor instability...
November 20, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/29149666/relationship-between-radiographic-patella-alta-pathology-and-walking-dysfunction-in-children-with-bilateral-spastic-cerebral-palsy
#16
Matthias Hösl, Harald Böhm, Michaela Seltmann, Chakravarthy Ugandhar Dussa, Leonhard Döderlein
BACKGROUND: Patella-alta is very common in patients with Cerebral Palsy (CP). While several diagnostic x-ray indices have been developed for patella-alta in general, the specific relationship with walking dysfunction in CP is only partly understood. METHODS: 33 participants with bilateral spastic CP between 4 and 20 years (GMFCS I-II without previous surgery) that underwent 3D gait analysis as well as a radiographic exam within 0.8 (SD 1.2) months were retrospectively included...
November 10, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29146686/specific-force-of-the-vastus-lateralis-in-adults-with-achondroplasia
#17
David Thomas Sims, Gladys L Onambele-Pearson, Adrian Burden, Carl Payton, Christopher I Morse
Achondroplasia is a clinical condition defined by shorter stature and disproportionate limb length. Force production in able-bodied individuals (controls) is proportional to muscle size, but given the disproportionate nature of Achondroplasia, normalising to anatomical cross sectional area (ACSA) is inappropriate. The aim of this study was to assess specific force of the vastus lateralis (VL) in 10 adults with Achondroplasia (22 ±3 yrs) and 18 gender matched controls (22 ±2 yrs). Isometric torque (iMVCτ) of the dominant knee extensors (KE) and in vivo measures of VL muscle architecture, volume, activation and patella tendon moment arm were used to calculate VL physiological CSA (PCSA), fascicle force and specific force in both groups...
November 16, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29142095/patterns-of-intermuscular-inhibitory-force-feedback-across-cat-hindlimbs-suggest-a-flexible-system-for-regulating-whole-limb-mechanics
#18
Mark A Lyle, T Richard Nichols
Prior work has suggested that Golgi tendon organ feedback, via its distributed network linking muscles spanning all joints, could be used by the nervous system to help regulate whole limb mechanics if appropriately organized. We tested this hypothesis by characterizing the patterns of intermuscular force dependent feedback between the primary extensor muscles spanning the knee, ankle and toes in decerebrate cat hindlimbs. Intermuscular force feedback was evaluated by stretching tendons of selected muscles in isolation and in pairwise combinations and then measuring the resulting force dependent intermuscular interactions...
November 15, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29138875/variant-course-of-extensor-pollicis-brevis-tendon-in-the-third-extensor-compartment
#19
Shiro Sugiura, Yusuke Matsuura, Takane Suzuki, Satoru Nishikawa, Chisato Mori, Kazuki Kuniyoshi
INTRODUCTION: According to the anatomical literature, the extensor pollicis brevis (EPB) tendon passes through the first compartment and enters the base of the proximal phalanx of the thumb. There have been a few reports on the different types of supernumerary EPB tendons; however, an unusual course of the EPB tendon is extremely rare. MATERIALS AND METHODS: During routine cadaveric dissection in the Department of Gross Anatomy, we detected an variant EPB muscle in a 96-year-old fresh female cadaver...
November 14, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/29132791/in%C3%A2-vitro-kinematic-assessment-of-a-hinged-elbow-orthosis-following-lateral-collateral-ligament-injury
#20
Ranita H Manocha, Graham J W King, James A Johnson
PURPOSE: Elbow lateral collateral ligament injuries (LCLI) are often managed with protected mobilization using a hinged elbow orthosis (HEO). The objective of this investigation was to determine the effectiveness of an HEO in stabilizing the elbow following LCLI. METHODS: Seven fresh-frozen cadaveric upper extremity specimens were studied using a custom simulator that enabled elbow motion via computer-controlled actuators and servomotors attached to relevant tendons...
November 11, 2017: Journal of Hand Surgery
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