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extensor tendons

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https://www.readbyqxmd.com/read/28094764/neuromorphic-meets-neuromechanics-part-ii-the-role-of-fusimotor-drive
#1
Kian Jalaleddini, Chuanxin Niu, Suraj Chakravarthi Raja, Won Joon Sohn, Gerald Loeb, Terence Sanger, Francisco Valero-Cuevas
OBJECTIVE: We studied the fundamentals of muscle afferentation by building a neuro-mechano-morphic system actuating a cadaveric finger. This system is a faithful implementation of the stretch reflex circuitry. It allowed the systematic exploration of the effects of different fusimotor drives to the muscle spindle on the closed-loop stretch reflex response. APPROACH: As in Part I of this work, sensory neurons conveyed proprioceptive information from muscle spindles (with static and dynamic fusimotor drive) to populations of ��-motor neurons (with recruitment and rate coding properties)...
January 17, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28078364/-ligament-injuries-of-fingers-and-thumbs
#2
R Schmitt
Degenerative and traumatic ligament lesions of the carpometacarpal joints frequently occur at the thumb ray, whereas the carpometacarpal amphiarthrosis of other finger rays are rarely affected. The metacarpophalangeal and interphalangeal joints of the thumb and fingers are stabilized by bilaterally running collateral ligaments and palmar plates. At the base of the metacarpophalangeal joints, several ligaments of the extensor hoods guide the extensor tendons and coordinate the fine motoric skills of phalangeal flexing and extending...
January 2017: Der Radiologe
https://www.readbyqxmd.com/read/28058481/extensor-tendinopathy-of-the-elbow-assessed-with-sonoelastography-histologic-correlation
#3
Andrea S Klauser, Mathias Pamminger, Ethan J Halpern, Mohamed M H Abd Ellah, Bernhard Moriggl, Mihra S Taljanovic, Christian Deml, Judit Sztankay, Guenther Klima, Werner R Jaschke
PURPOSE: To compare agreement between conventional B-mode ultrasound (US) and compression sonoelastography (SEL) of the common extensor tendons of the elbow with histological evaluation. MATERIALS AND METHODS: Twenty-six common extensor tendons were evaluated in 17 cadavers (11 females, median age 85 years and 6 males, median age 80 years). B-mode US was graded into: Grade 1, homogeneous fibrillar pattern; grade 2, hypoechoic areas and/or calcifications <30%; and grade 3 > 30%...
January 5, 2017: European Radiology
https://www.readbyqxmd.com/read/28052836/functional-recovery-following-an-l-lengthening-local-tendon-flap-for-extensor-pollicis-longus-chronic-ruptures
#4
Luis Lobo-Escolar, Isabel López Moreno, Marta Pérez Montoya, Manel Bosch-Aguilá
PURPOSE: Extensor indicis proprius tendon transfer has been considered the reference standard technique for extensor pollicis longus (EPL) chronic ruptures, but relevant complications have been reported. We describe a new reconstructive technique for chronic EPL ruptures and assess functional recovery after this procedure. METHODS: We observed 31 patients who fulfilled inclusion criteria an average of 6.8 months after treatment. An L-shaped local tendon flap was prepared by making a transverse incision to the middle of the tendon and then longitudinally toward the end of one of the tendon stumps...
January 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/28052415/arthroscopic-approach-and-intra-articular-anatomy-of-the-dorsal-and-plantar-synovial-compartments-of-the-bovine-tarsocrural-joint
#5
Hélène Lardé, Sylvain Nichols, Marie Babkine, André Desrochers
OBJECTIVE: To determine arthroscopic approaches to the dorsal and plantar synovial compartments of the tarsocrural joint in adult cattle, and to describe the arthroscopic intra-articular anatomy from each approach. STUDY DESIGN: Ex vivo study. ANIMALS: Fresh adult bovine cadavers (n = 7). METHODS: Two tarsocrural joint were injected with latex to determine arthroscopic portal locations and arthroscopy of the tarsocrural joint of 12 tarsi was performed...
January 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28050355/a-rare-case-of-anomalous-origin-of-first-lumbrical-from-the-tendon-of-flexor-digitorum-superficialis-to-index-finger
#6
S Trivedi, B C Satapathy, M Rathore, M B Sinha
Human hand is involved in variety of precision work which requires a combined effort of forearm muscles as well as intrinsic muscles of hand. Lumbricals along with interossei muscles connect the tendons of flexor and extensor muscles and thus play a key role in the characteristic movements of human hands. Lumbricals originate from long flexor tendon and is inserted into dorsal digital expansion. Any variation in the attachment of these muscles can lead to deviation from the normal actions of the fingers and their proximal extension into carpal tunnel and might lead to carpal tunnel syndrome...
November 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28049986/alcoholic-myelopathy-and-nutritional-deficiency
#7
Haruki Koike, Tomohiko Nakamura, Shohei Ikeda, Mie Takahashi, Yuichi Kawagashira, Masahiro Iijima, Masahisa Katsuno, Gen Sobue
A patient with chronic alcoholism presented with myelopathy and low serum folate and cobalamin levels. A 42-year-old alcoholic man had gait disturbance for 4 months. A neurological examination revealed marked spasticity with increased deep tendon reflexes and extensor plantar responses of the lower limbs. His cobalamin level was decreased and his serum folate level was particularly low. His plasma ammonia level was not increased. Abstinence and folic acid and cobalamin supplementation stopped the progression of his neurological deficits...
2017: Internal Medicine
https://www.readbyqxmd.com/read/28044199/muscle-fascicle-shortening-behaviour-of-vastus-lateralis-during-a-maximal-force-velocity-test
#8
Hugo Hauraix, Sylvain Dorel, Giuseppe Rabita, Gaël Guilhem, Antoine Nordez
PURPOSE: Muscle fascicles-tendon interactions are the main determinant in production of high joint velocity. Currently, no study has investigated the muscle fascicles behaviour of knee extensor muscles until the highest reachable velocity (e.g., unloaded knee extension). We aimed to track the changes in vastus lateralis fascicles length during knee extensions to quantify muscle fascicles and tendinous tissues contributions to muscle-tendon unit shortening and to determine maximal muscle fascicles shortening velocity...
January 3, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28044000/painful-locking-of-the-wrist-in-a-patient-with-pseudoachondroplasia-confirmed-by-comp-mutation
#9
Hirokazu Ideta, Shigeharu Uchiyama, Masanori Hayashi, Tomoki Kosho, Yukio Nakamura, Hiroyuki Kato
We report the case of a 40-year-old woman with pseudoachondroplasia (PSACH), with a heterozygous mutation (c.806A > G, p.Asp269Gly) located in the Type 3 repeats domain of the cartilage oligomeric matrix protein gene, who complained of the unusual symptom of painful locking of the wrist. Her condition was caused by a non-traumatic enlargement of the extensor carpi radialis longus (ECRL) and brevis (ECRB) tendons along with bulbous swelling of the synoviums around them. Surgical treatment resolved these unusual tendon-related symptoms...
January 2, 2017: Journal of Surgical Case Reports
https://www.readbyqxmd.com/read/28040091/reconstruction-of-patellar-tendon-following-implantation-of-proximal-tibia-megaprosthesis-for-the-treatment-of-post-traumatic-septic-bone-defects
#10
Giorgio M Calori, Emilio Luigi Mazza, Luca Vaienti, Simone Mazzola, Alessandra Colombo, Luca Gala, Massimiliano Colombo
INTRODUCTION: Latest advances made in joint replacement implants allows reconstruction of entire limbs. These special prostheses or megaprostheses were originally designed for the treatment of severe oncological bone loss. Nowadays, however, the indications and applications of these devices are expanding to other orthopaedic and trauma clinical conditions. Since 2008 we have implanted 152 megaprostheses in non-oncological conditions: 87 were implanted for post-traumatic failures aseptic/septic (represented by complex non-unions and critical size bone defects); 26 total femur, 52 distal femur and 9 proximal tibia...
December 2016: Injury
https://www.readbyqxmd.com/read/28026735/-quantitative-analysis-of-power-doppler-images-in-lateral-humeral-enthesopathy
#11
P Walder, L Paša, L Pavliska
PURPOSE OF THE STUDY The evaluation of efficiency of power Doppler sonography in the diagnosis of lateral humeral enthesopathy, role of correct assessment of Doppler sonographic images with the method of quantitative analysis, assessment of statistical differences between a group of patients with lateral humeral enthesopathy and a control group of healthy subjects and assessment of the diagnostic power of this test. In addition, consideration of the relevance of each area of the lateral compartment for assessment and diagnosis making in lateral humeral enthesopathy...
2016: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
https://www.readbyqxmd.com/read/28026732/-spontaneous-tendon-ruptures-in-the-rheumatoid-hand
#12
J Pech, D Veigl, M Vlček
A spontaneous tendon rupture is a direct consequence of rheumatoid inflammation and can appear without any noticeable impact, often during sleep. The patient then presents with inability to flex or extend metacarpophalageal or interphalangeal joints. Multiple ruptures resulting in impaired function of several fingers can also occur and markedly limit the hand's grip strength. A tear may arise from either mechanical injury to the tendon along its course over bone or connective tissues, or by biochemical action of lysosomal enzymes, released during the inflammation process, on the connective tissue of the tendon...
2016: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
https://www.readbyqxmd.com/read/28018074/simultaneous-posterior-dislocation-of-primary-total-knee-arthroplasty-with-ipsilateral-tibial-shaft-fracture-a-case-report-and-review-of-literature
#13
Alpaslan Öztürk, Yavuz Akalin, Nazan Çevik, Mustafa Çınar Akça
Dislocation following total knee arthroplasty (TKA) is a rare but serious complication. Here, a 74-year-old woman with posterior dislocation of her right cruciate-retaining TKA and ipsilateral tibia diaphysis fracture was presented. She only slipped down on the ground with a quick twist of her right leg. She underwent revision semiconstrained TKA and osteosynthesis of tibial fracture with plate and screw. Her partially avulsed patellar tendon was repaired as well. She was ambulatory with a cane and satisfied with revision operation at last control...
October 2016: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/28003562/a-novel-diffusion-tensor-mri-approach-for-skeletal-muscle-fascicle-length-measurements
#14
Jos Oudeman, Valentina Mazzoli, Marco A Marra, Klaas Nicolay, Mario Maas, Nico Verdonschot, Andre M Sprengers, Aart J Nederveen, Gustav J Strijkers, Martijn Froeling
Musculoskeletal (dys-)function relies for a large part on muscle architecture which can be obtained using Diffusion-Tensor MRI (DT-MRI) and fiber tractography. However, reconstructed tracts often continue along the tendon or aponeurosis when using conventional methods, thus overestimating fascicle lengths. In this study, we propose a new method for semiautomatic segmentation of tendinous tissue using tract density (TD). We investigated the feasibility and repeatability of this method to quantify the mean fascicle length per muscle...
December 2016: Physiological Reports
https://www.readbyqxmd.com/read/27997073/effects-of-growth-on-muscle-tendon-and-aponeurosis-tissues-in-rabbit-shank-musculature
#15
Markus Böl, Kay Leichsenring, Tobias Siebert
There exist several studies using morphological analyses of skeletal muscles to obtain a better understanding of muscle structure. The structural information obtained are primarily determined from single muscle components using individual animals of discrete ages. Further, little is known about changing dimensions of the aponeurosis, which is an important load-transferring interface in muscle mechanics. Thus, the aim of the present study was to determine how the muscle, tendon, and particularly the aponeurosis geometry of the rabbit shank musculature (M...
December 20, 2016: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/27992239/differential-effects-of-two-rehabilitation-programs-following-anterior-cruciate-ligament-reconstruction
#16
Igor Setuain, Mikel Izquierdo, Fernando Idoate, Eder Bikandi, Esteban M Gorostiaga, Per Aagaard, Eduardo L Cadore, Jesús Alfaro-Adrián
Context- The muscular function restoration related to the type of physical rehabilitation followed after anterior cruciate ligament reconstruction (ACLR) using autologous hamstring tendon graft in terms of strength and cross sectional area (CSA) remain controversial. Objective- To analyze the CSA and force output of quadriceps and hamstring muscles in subjects following either an Objective Criteria-Based rehabilitation (OCBR) algorithm or the usual care (UCR) for ACL rehabilitation in Spain, before and one year after undergoing an ACLR...
December 19, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27989337/review-of-drop-hallux-assessment-and-surgical-repair
#17
Carl A Kihm, Craig A Camasta
Peroneal nerve palsy is common. The hallmark clinical manifestation of peroneal nerve palsy is drop foot. In the drop foot condition, the ankle cannot flex, and the foot does not clear the ground during the swing phase of gait. Spontaneous nerve repair can yield complete or incomplete resolution of drop foot. Some patients with incomplete resolution are left with a drop hallux condition, in which the ankle can dorsiflex, but the hallux remains unable to dorsiflex. This has not been thoroughly discussed in the past, regarding surgical repair...
January 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/27939752/influence-of-patellar-position-on-the-knee-extensor-mechanism-in-normal-and-crouched-walking
#18
Rachel L Lenhart, Scott C E Brandon, Colin R Smith, Tom F Novacheck, Michael H Schwartz, Darryl G Thelen
Patella alta is common in cerebral palsy, especially in patients with crouch gait. Correction of patella alta has been advocated in the treatment of crouch, however the appropriate degree of correction and the implications for knee extensor function remain unclear. Therefore, the goal of this study was to assess the impact of patellar position on quadriceps and patellar tendon forces during normal and crouch gait. To this end, a lower extremity musculoskeletal model with a novel 12 degree of freedom knee joint was used to simulate normal gait in a healthy child, as well as mild (23 deg min knee flexion in stance), moderate (41 deg), and severe (67 deg) crouch gait in three children with cerebral palsy...
January 25, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/27939069/reverse-anterior-cruciate-ligament-reconstruction-fixation-a-biomechanical-comparison-study-of-tibial-cross-pin-and-femoral-interference-screw-fixation
#19
Richard J Lawley, Samuel E Klein, Steven C Chudik
PURPOSE: To evaluate the biomechanical performance of tibial cross-pin (TCP) fixation relative to femoral cross-pin (FCP), femoral interference screw (FIS), and tibial interference screw (TIS) fixation. METHODS: We randomized 40 porcine specimens (20 tibias and 20 femurs) to TIS fixation (group 1, n = 10), FIS fixation (group 2, n = 10), TCP fixation (group 3, n = 10), or FCP fixation (group 4, n = 10) and performed biomechanical testing to compare ultimate load, stiffness, yield load, cyclic displacement, and load at 5-mm displacement...
December 8, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/27932401/medium-to-long-term-outcomes-of-anatomical-reconstruction-of-the-radioulnar-ligament-to-the-ulnar-fovea
#20
T Nakamura, K Abe, M Nishiwaki, T Iwamoto, K Sato
: We examined the medium- to long-term outcome of the original reconstruction technique of the radioulnar ligament using a half-slip of the extensor carpi ulnaris tendon for chronic foveal avulsion of the triangular fibrocartilage complex. We treated 37 wrists in 36 patients with a minimum follow-up of 5 years. Of 36 patients, 12 had more than 10 years follow-up. At final follow-up, 30 patients (31 wrists) reported no pain, five patients (five wrists) reported mild occasional pain and one patient reported severe persistent pain...
December 8, 2016: Journal of Hand Surgery, European Volume
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