Patellar Tendinopathy

Schwartz, Aaron; Watson, Jonathan N.; Hutchinson, Mark R.

doi:10.1177/1941738114568775

Cited by 83 publications

(82 citation statements)

References 92 publications

(162 reference statements)

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“…Concerning nociception, this analysis confirms the previous study by Schubert et al (), which showed there were more receptors in fascia affected by Dupuytren's disease, considered an inflammatory disorder (Baird et al, ; Meek et al, ; Qureshi et al, ). In some similar connective tissue diseases such as Achilles tendinosis (Schubert et al, ), patellar tendinopathy (Fu et al, ; Schwartz et al, ) and thoracolumbar inflammation (Bednar et al, ; Hoheisel et al, ; Mense and Hoheisel, ), substance P‐positive nerve fibers have been seen to sprout: substance P is a neurotransmitter involved in both fibroblast stimulation (Lai et al, ) and nociception (Mashaghi et al, ). The effect could be attributable to increased secretion of nerve growth factor (Lubahn et al, ), which acts on both nerve fibers and fibroblasts, causing differentiation into myofibroblasts.…”

Section: Discussionmentioning

confidence: 99%

Hand fasciae innervation: The palmar aponeurosis

et al. 2018

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There are few data in the scientific literature about the innervation of fasciae of the hand. The present study first elucidates the density and location of nervous structures in the palmar aponeurosis and, for comparison, in the flexor retinaculum (both can be considered specializations of the deep fascia of the upper limbs). Second, it compares nonpathological with pathological palmar aponeurosis. Samples of nonpathological fascia were taken from the flexor retinaculum and palmar aponeurosis of 16 upper limbs of unembalmed cadavers. Samples of pathological palmar aponeurosis were taken from seven patients with Dupuytren's disease. All samples were stained immunohistochemically with anti-S100 and anti-tubulin antibodies, and analyzed quantitatively and qualitatively by microscopy. The palmar aponeurosis showed higher median density than the retinacula of free nerve endings (22 and 20 elements/cm , respectively), Pacinian corpuscles (2 and 0 elements/cm ) and Golgi-Mazzoni corpuscles (1.0 and 0.5 element/cm ). Some corpuscles were located at the intersections of the fibers in the three directions. Free nerve endings were denser in pathological palmar aponeurosis (38 elements/cm ). The results indicate that the palmar aponeurosis is central to proprioception of the hand and that surgery should therefore avoid injuring it. The higher density of free nerve endings in pathological samples indicates that the nervous structures are implicated in the amplified fibrosis of Dupuytren's disease. Clin. Anat. 31:677-683, 2018. © 2018 Wiley Periodicals, Inc.

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Section: Discussionmentioning

confidence: 99%

Hand fasciae innervation: The palmar aponeurosis

et al. 2018

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“…Patellar tendinosis is common and typically manifests as anterior knee pain (11). Also referred to as jumper's knee, patellar tendinosis commonly affects athletes in sports that require jumping, such as basketball, and involves the proximal aspect of the tendon.…”

Section: Hemarthrosis and Lipohemarthrosis-onementioning

confidence: 99%

US of the Knee: Scanning Techniques, Pitfalls, and Pathologic Conditions

Alves¹,

Girish²,

Brigido³

et al. 2016

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1Pain and other disorders of the knee are a common presenting complaint in the ambulatory setting. Although the cornerstones of imaging evaluation of the knee are radiographs and magnetic resonance (MR) imaging, ultrasonography (US) is less expensive than MR imaging, easily available, and of comparable accuracy in the evaluation of certain pathologic conditions of the knee. The benefits of US include portability, low cost, high spatial resolution, dynamic imaging, and ability to guide percutaneous interventions when indicated. US also allows direct patient contact, facilitating immediate clinical correlation and the ability to compare with the contralateral knee. US evaluation of the knee can be targeted to a specific region on the basis of the complaint or be a comprehensive review. For comprehensive evaluation, the knee is divided into anterior, medial, lateral, and posterior compartments for structured evaluation of the tendons, ligaments, joint space, osseous structures, as well as peripheral nerves and vasculature. US is particularly well suited for evaluating injuries of the quadriceps and patellar tendons, injuries of the medial and lateral collateral ligaments, joint effusions, and fluid collections around the knee. There is additional utility in evaluation of the distal hamstrings tendons, the iliotibial tract, the superficial patellar cortex, the common peroneal nerve, the popliteal vessels, and juxta-articular cystic collections including Baker cyst. In-depth appreciation of relevant sonographic anatomy, common pathologic conditions, knowledge of important pitfalls, and mastery of US technique will allow one to effectively use this powerful bedside tool for the evaluation of a wide variety of knee disorders.

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“…We chose to study the PT and FDL tendons for several reasons. We chose the PT for this and previous studies due to the high prevalence of patellar tendinopathy, its ease of harvest, and its ability to allow light transmission for polarized‐light imaging. More broadly, studying murine tendons enables use in transgenic animals .…”

Section: Discussionmentioning

confidence: 99%

Tendon Biomechanics and Crimp Properties Following Fatigue Loading Are Influenced by Tendon Type and Age in Mice

Zuskov

Freedman

Gordon

et al. 2019

Journal Orthopaedic Research

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In tendon, type‐I collagen assembles together into fibrils, fibers, and fascicles that exhibit a wavy or crimped pattern that uncrimps with applied tensile loading. This structural property has been observed across multiple tendons throughout aging and may play an important role in tendon viscoelasticity, response to fatigue loading, healing, and development. Previous work has shown that crimp is permanently altered with the application of fatigue loading. This opens the possibility of evaluating tendon crimp as a clinical surrogate of tissue damage. The purpose of this study was to determine how fatigue loading in tendon affects crimp and mechanical properties throughout aging and between tendon types. Mouse patellar tendons (PT) and flexor digitorum longus (FDL) tendons were fatigue loaded while an integrated plane polariscope simultaneously assessed crimp properties at P150 and P570 days of age to model mature and aged tendon phenotypes (N = 10–11/group). Tendon type, fatigue loading, and aging were found to differentially affect tendon mechanical and crimp properties. FDL tendons had higher modulus and hysteresis, whereas the PT showed more laxity and toe region strain throughout aging. Crimp frequency was consistently higher in FDL compared with PT throughout fatigue loading, whereas the crimp amplitude was cycle dependent. This differential response based on tendon type and age further suggests that the FDL and the PT respond differently to fatigue loading and that this response is age‐dependent. Together, our findings suggest that the mechanical and structural effects of fatigue loading are specific to tendon type and age in mice. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 38:36–42, 2020

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Patellar Tendinopathy

Cited by 83 publications

References 92 publications

Hand fasciae innervation: The palmar aponeurosis

Hand fasciae innervation: The palmar aponeurosis

US of the Knee: Scanning Techniques, Pitfalls, and Pathologic Conditions

Tendon Biomechanics and Crimp Properties Following Fatigue Loading Are Influenced by Tendon Type and Age in Mice

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