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Flexor tendon

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https://www.readbyqxmd.com/read/29034479/scaling-of-the-ankle-extensor-muscle-tendon-units-and-the-biomechanical-implications-for-bipedal-hopping-locomotion-in-the-post-pouch-kangaroo-macropus-fuliginosus
#1
Edward P Snelling, Andrew A Biewener, Qiaohui Hu, David A Taggart, Andrea Fuller, Duncan Mitchell, Shane K Maloney, Roger S Seymour
Bipedal hopping is used by macropods, including rat-kangaroos, wallabies and kangaroos (superfamily Macropodoidea). Interspecific scaling of the ankle extensor muscle-tendon units in the lower hindlimbs of these hopping bipeds shows that peak tendon stress increases disproportionately with body size. Consequently, large kangaroos store and recover more strain energy in their tendons, making hopping more efficient, but their tendons are at greater risk of rupture. This is the first intraspecific scaling analysis on the functional morphology of the ankle extensor muscle-tendon units (gastrocnemius, plantaris and flexor digitorum longus) in one of the largest extant species of hopping mammal, the western grey kangaroo Macropus fuliginosus (5...
October 16, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/29026819/the-role-of-dynamic-ultrasound-in-the-immediate-conservative-treatment-of-volar-plate-injuries-of-the-pip-joint-a-series-of-78-patients
#2
Franck Marie Leclère, Lukas Mathys, Bettina Juon, Esther Vögelin
INTRODUCTION: The management of volar plate avulsion fractures in the context of a stable joint and a bony fragment of less than 30% has traditionally been conservative. This study was performed to assess volar plate healing with high-resolution ultrasound in order to provide early full mobilization. MATERIAL AND METHODS: Between January 2012 and December 2013, 78 patients with volar plate injuries of the proximal interphalangeal (PIP) joints (42 distortions and 36 dislocations) were treated conservatively in our department for volar plate avulsion fracture associated with stable joint and bony fragment inferior to 30% of the intra-articular surface assessed both by radiography and ultrasound...
August 2017: Plastic Surgery
https://www.readbyqxmd.com/read/29026818/variations-in-the-anatomical-structures-of-the-guyon-canal
#3
Zahir T Fadel, Osama A Samargandi, David T Tang
BACKGROUND: Compression neuropathy of the ulnar nerve at the Guyon canal is commonly seen by hand surgeons. Different anatomical variations of structures related to the Guyon canal have been reported in the literature. A thorough knowledge of the normal contents and possible variations is essential during surgery and exploration. OBJECTIVES: To review the recognized anatomical variations within and around the Guyon canal. METHODS: This study is a narrative review in which relevant papers, clinical studies, and anatomical studies were selected by searching electronic databases (PubMed and EMBASE)...
May 2017: Plastic Surgery
https://www.readbyqxmd.com/read/29023489/spatiotemporal-variations-in-gene-expression-histology-and-biomechanics-in-an-ovine-model-of-tendinopathy
#4
Sara Biasutti, Andrew Dart, Margaret Smith, Carina Blaker, Elizabeth Clarke, Leo Jeffcott, Christopher Little
Flexor tendinopathy is a common problem affecting humans and animals. Tendon healing is poorly understood and the outcomes of conservative and surgical management are often suboptimal. While often considered a localized injury, recent evidence indicates that in the short term, tendinopathic changes are distributed widely throughout the tendon, remote from the lesion itself. Whether these changes persist throughout healing is unknown. The aim of this study was to document gene expression, histopathological and biomechanical changes that occur throughout the superficial digital flexor tendon (SDFT) up to 16 weeks post-injury, using an ovine surgical model of tendinopathy...
2017: PloS One
https://www.readbyqxmd.com/read/29022820/a-simple-method-to-find-the-proximal-stump-of-the-cut-flexor-pollicis-longus-tendon-in-the-thenar-zone
#5
G Mouzopoulos, C H Vlachos, L Karantzalis, K Vlachos
No abstract text is available yet for this article.
September 13, 2017: Annals of the Royal College of Surgeons of England
https://www.readbyqxmd.com/read/29020826/redefining-zone-ii-anatomy-of-the-flexor-digitorum-superficialis-insertion
#6
Luke T Nicholson, Jeffrey R Hill, Braden McKnight, Nathanael Heckmann, Milan Stevanovic, Alidad Ghiassi
BACKGROUND: Flexor zone II is defined as the region spanning the proximal aspect of the A1 pulley to the insertion of the flexor digitorum superficialis (FDS) tendon. Descriptions of the FDS insertion are inconsistent in the literature, but zones of injury are frequently determined with reference to superficial landmarks. The purpose of this study was to describe the footprint of the FDS insertion and define its relationship to the proximal interphalangeal (PIP) skin crease. METHODS: The FDS insertion on the index, middle, ring, and small fingers was dissected in 6 matched pairs of fresh-frozen cadaveric hands...
October 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/29018808/tenogenically-induced-allogeneic-peripheral-blood-mesenchymal-stem-cells-in-allogeneic-platelet-rich-plasma-2-year-follow-up-after-tendon-or-ligament-treatment-in-horses
#7
Charlotte Beerts, Marc Suls, Sarah Y Broeckx, Bert Seys, Aurélie Vandenberghe, Jeroen Declercq, Luc Duchateau, Martin A Vidal, Jan H Spaas
Poor healing of tendon and ligament lesions often results in early retirement of sport horses. Therefore, regenerative therapies are being explored as potentially promising treatment for these injuries. In this study, an intralesional injection was performed with allogeneic tenogenically induced mesenchymal stem cells and platelet-rich plasma 5-6 days after diagnosis of suspensory ligament (SL) (n = 68) or superficial digital flexor tendon (SDFT) (n = 36) lesion. Clinical, lameness and ultrasonographic evaluation was performed at 6 and 12 weeks...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28994884/trauma-of-the-hand-from-circular-saw-table-a-series-of-a-130-cases
#8
Yafa Hadj Hassine, Mohamed Hmid, Walid Baya
INTRODUCTION: Trauma of the hand from a circular saw table is a common occurrence in developing countries it tends to occur in young hand working people and it causes a serious lesions. METHODS: It was a retrospective series about a 130 cases of hand trauma from circular saw table. Epidemiological features, treatment, and permanent disabilities left by hand trauma from circular saw table were studied to identify ways to prevent such an accident. RESULTS: The average age was 31...
December 2016: La Tunisie Médicale
https://www.readbyqxmd.com/read/28993565/a-retrospective-study-of-radiographic-abnormalities-in-the-repositories-for-thoroughbreds-at-yearling-sales-in-japan
#9
Daisuke Miyakoshi, Hiroyuki Senba, Mitsumori Shikichi, Masaya Maeda, Ryo Shibata, Kazuhiro Misumi
This study aimed to evaluate whether radiographic abnormalities at yearling sales were associated with the failure to start racing at 2-3 years of age. Radiographic abnormalities in the carpal (n=852), tarsal (n=976), metacarpophalangeal (n=1,055), and metatarsophalangeal joints (n=1,031) from 1,082 horses, recorded at yearling sale, were reviewed. Eighty-two horses (7.6%) failed to start racing. Radiographic abnormalities such as wedged or collapsed tarsal bones, irregular lucency of a sagittal ridge at the distal aspect of the distal third metatarsal bone, and proximal dorsal fragmentation of the first phalanx in metatarsophalangeal joints were associated with failure to start racing in these horses...
October 6, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28993165/motor-sparing-continuous-median-nerve-block-for-hand-surgery-a%C3%A2-pediatric-case
#10
Takeshi Murouchi
Here is described a successful perioperative pain control with continuous median nerve block after flexor tendon repair surgery on 2nd finger of a child. A 9-year-old patient was admitted for reconstruction surgery. The combination of median nerve block and lateral/medial antecubital cutaneous nerve blocks were performed before the surgery to cover all the surgical incision including the 2nd finger, palm, the graft site proximal to the wrist, and Kleinert traction at the nail bed. At the end of the surgery, the infusion catheter was inserted at the distal one-third to spare the muscle strength of flexor digitorum muscles...
September 22, 2017: Asian J Anesthesiol
https://www.readbyqxmd.com/read/28986075/the-scope-of-upper-limb-surgery-for-tetraplegics-role-of-tendon-transfers-and-universal-cuff
#11
Mukul Mohindra, Paritosh Gogna, Sukhbir Singh Sangwan, Sahil Gaba, Zile Singh Kundu
OBJECTIVE: The aim of this study was to evaluate the role of tendon transfers and universal cuff in restoring hand function in tetraplegic patients. METHODS: Twenty-one upper limbs on 12 tetraplegic patients (9 males and 3 females); mean age: 42.2 years (range 22-58 years) with a spinal cord injury at or distal to C6, were included in this study. Key pinch was restored using Brachioradialis to Flexor Pollicis Longus transfer and hook using Pronator Teres to Flexor Digitorum Profundus transfer...
October 4, 2017: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/28985979/feasibility-of-a-new-pulley-repair-a%C3%A2-cadaver-study
#12
Isabelle Schöffl, Julia Meisel, Christoph Lutter, Volker Schöffl
PURPOSE: In this study, the feasibility of a new pulley reconstruction in which the tendon graft is pulled through a tunnel in the proximal phalanx, was evaluated using a cadaver model, with particular attention paid to the weakening of the bone structure by the drill hole. METHODS: Nine fingers from 6 cadaver hands with intact pulley systems were compared with 9 fingers from 6 cadaver hands with missing A2 to A4 pulleys but that included a repair using the new surgical technique...
October 4, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/28980027/-insertional-achilles-tendinopathy-differentiated-diagnostics-and-therapy
#13
REVIEW
S F Baumbach, M Braunstein, M G Mack, F Maßen, W Böcker, S Polzer, H Polzer
Achilles tendinopathy at the calcaneal insertion is classified into insertional tendinopathy, retrocalcaneal and superficial bursitis. The aim of this study was to present the current evidence on conservative and surgical treatment of insertional tendinopathy of the Achilles tendon. Conservative first-line therapy includes reduction of activity levels, administration of non-steroidal anti-inflammatory drugs (NSAID), adaptation of footwear, heel wedges and orthoses or immobilization. In addition, further conservative therapy options are also available...
October 4, 2017: Der Unfallchirurg
https://www.readbyqxmd.com/read/28975818/relative-motion-flexion-splinting-for-flexor-tendon-lacerations-proof-of-concept
#14
Bryan Chung, David T W Chiu, Vishal Thanik
BACKGROUND: The principle of relative motion has allowed patients to regain a higher degree of hand function, while protecting extensor tendon repairs. The purpose of this study was to determine whether the principle of relative motion could be a viable method to protect a flexor tendon repair. METHODS: Four fresh-frozen cadaver arms were each mounted on a testing apparatus (wrist in 30° of extension, metacarpophalangeal [MCP] joints blocked to 70°-80°). A minimum of 11 N was used to cyclically load the flexor digitorum profundus and extensor digitorum communis tendons to maximum allowable flexion and extension for 25 cycles...
October 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28972426/an-investigation-of-a-novel-tendon-transfer-surgery-for-high-median-ulnar-nerve-palsy-in-a-chicken-model
#15
Geoffrey R Browning, Anthony H Le, Jennifer J Warnock, Ravi Balasubramanian
PURPOSE: The state-of-the-art tendon transfer surgery for high median-ulnar nerve palsy involves directly suturing four finger flexor tendons to one wrist extensor muscle. This couples finger flexion limiting the patient's ability to grasp objects. Therefore, we propose a new approach to attach a novel passive implant to the extensor digitorum longus tendon in order to create a differential mechanism in situ. The implant is expected to enable the fingers to adapt to an object's shape during grasping...
October 3, 2017: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/28971327/importance-of-consistent-datasets-in-musculoskeletal-modelling-a-study-of-the-hand-and-wrist
#16
Benjamin Goislard De Monsabert, Dafydd Edwards, Darshan Shah, Angela Kedgley
Hand musculoskeletal models provide a valuable insight into the loads withstood by the upper limb; however, their development remains challenging because there are few datasets describing both the musculoskeletal geometry and muscle morphology from the elbow to the finger tips. Clinical imaging, optical motion capture and microscopy were used to create a dataset from a single specimen. Subsequently, a musculoskeletal model of the wrist was developed based on these data to estimate muscle tensions and to demonstrate the potential of the provided parameters...
October 2, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28967444/cyclic-testing-of-the-6-strand-tang-and-modified-lim-tsai-flexor-tendon-repair-techniques
#17
Gavrielle Hui-Ying Kang, Yoke-Rung Wong, Rebecca Qian-Ru Lim, Austin Mun-Kitt Loke, Shian-Chao Tay
PURPOSE: In this study, we compared the Tang repair technique with the 6-strand modified Lim-Tsai repair technique under cyclic testing conditions. METHODS: Twenty fresh-frozen porcine flexor tendons were randomized into 2 groups for repair with either the modified Lim-Tsai or the Tang technique using Supramid 4-0 core sutures and Ethilon 6-0 epitendinous running suture. The repaired tendons were subjected to 2 stage cyclic loading. The survival rate and gap formation at the repair site were recorded...
September 26, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/28960382/ultrasonographic-evaluation-of-zone-ii-partial-flexor-tendon-lacerations-of-the-fingers-a-cadaveric-study
#18
Nikolas H Kazmers, Joshua A Gordon, Kristen L Buterbaugh, David J Bozentka, David R Steinberg, Viviane Khoury
OBJECTIVES: Accurate assessment of zone II partial flexor tendon lacerations in the finger is clinically important. Surgical repair is recommended for lacerations of greater than 50% to 60%. Our goal was to evaluate ultrasonographic test characteristics and accuracy in identifying partial flexor tendon lacerations in a cadaveric model. METHODS: From fresh-frozen above-elbow human cadaveric specimens, 32 flexor digitorum profundus tendons were randomly selected to remain intact or receive low- or high-grade lacerations involving 10% to 40% and 60% to 90% of the radioulnar width within Verdan Zone II, respectively...
September 29, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28954818/elastic-ankle-muscle-tendon-interactions-are-adjusted-to-produce-acceleration-during-walking-in-humans
#19
Dominic James Farris, Brent James Raiteri
Humans and other cursorial mammals have distal leg muscles with high in-series compliance that aid locomotor economy. This muscle-tendon design is considered sub-optimal for injecting net positive mechanical work. However, humans change speed frequently when walking and any acceleration requires net positive ankle work. The present study unveiled how the muscle-tendon interaction of human ankle plantar flexors are adjusted and integrated with body mechanics to provide net positive work during accelerative walking...
September 27, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28952393/ultrahigh-frequency-ultrasound-imaging-of-the-hand-a-new-diagnostic-tool-for-hand-surgery
#20
Stephen L Viviano, Laurel K Chandler, Jonathan D Keith
BACKGROUND: Ultrasonography is a cost-effective, noninvasive, and expedient imaging modality with numerous clinical applications. Conventional ultrasound uses transducers with frequencies that range from 5 to 12 MHz. However, ultrahigh frequency ultrasound (UHFUS) is capable of producing frequencies up to 70 MHz, which can achieve tissue resolution up to 30 μm. The purpose of our study is to present the capabilities of a novel technology and to describe its possible clinical applications for hand surgery...
September 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
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