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Joint laxity

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https://www.readbyqxmd.com/read/29230159/spondyloepimetaphysial-dysplasia-with-joint-laxity-in-three-siblings-with-b3galt6-mutations
#1
Pamela Trejo, Frank Rauch, Francis H Glorieux, Jean Ouellet, Thierry Benaroch, Philippe M Campeau
Spondyloepimetaphyseal dysplasia with joint laxity type 1 (SEMDJL1) is a rare entity with a recessive inheritance. In this report, we describe 3 affected members of the same family who present with short stature, hyperlaxity with secondary spinal malalignment, ulnar subluxation, developmental dysplasia of the hips, and craniofacial alterations; one member also had learning difficulties. DNA analysis showed compound heterozygous variants in the B3GALT6 gene (c.901_921dup, c.511C>T) in all 3 patients, inherited from the parents...
November 2017: Molecular Syndromology
https://www.readbyqxmd.com/read/29214465/the-peripheral-soft-tissues-should-not-be-ignored-in-the-finite-element-models-of-the-human-knee-joint
#2
Hamid Naghibi Beidokhti, Dennis Janssen, Sebastiaan van de Groes, Nico Verdonschot
In finite element models of the either implanted or intact human knee joint, soft tissue structures like tendons and ligaments are being incorporated, but usually skin, peripheral knee soft tissues, and the posterior capsule are ignored and assumed to be of minor influence on knee joint biomechanics. It is, however, unknown how these peripheral structures influence the biomechanical response of the knee. In this study, the aim was to assess the significance of the peripheral soft tissues and posterior capsule on the kinematics and laxities of human knee joint, based on experimental tests on three human cadaveric specimens...
December 7, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29189882/the-transportal-technique-shows-better-clinical-results-than-the-transtibial-techniques-for-single-bundle-anterior-cruciate-ligament-reconstruction
#3
Kyung-Han Ro, Hyun-Jung Kim, Dae-Hee Lee
PURPOSE: Although anatomical and independent drilling techniques, such as transportal (TP) technique, have become more popular in anterior cruciate ligament (ACL) reconstruction, the TP technique has not been shown to yield superior clinical or functional outcomes compared to the transtibial (TT) technique. The aim of the current meta-analysis was to compare clinical outcomes of the TP and TT techniques, as determined by patient-reported outcome scores and knee joint laxity tests. It was hypothesized that the TP and TT techniques of ACL reconstruction would yield similar patient-reported functional outcomes and similar results on knee joint laxity tests...
November 30, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29181558/internal-external-malalignment-of-the-femoral-component-in-kinematically-aligned-total-knee-arthroplasty-increases-tibial-force-imbalance-but-does-not-change-laxities-of-the-tibiofemoral-joint
#4
Jeremy Riley, Joshua D Roth, Stephen M Howell, Maury L Hull
PURPOSE: The purposes of this study were to quantify the increase in tibial force imbalance (i.e. magnitude of difference between medial and lateral tibial forces) and changes in laxities caused by  2° and 4° of internal-external (I-E) malalignment of the femoral component in kinematically aligned total knee arthroplasty. Because I-E malalignment would introduce the greatest changes to the articular surfaces near 90° of flexion, the hypotheses were that the tibial force imbalance would be significantly increased near 90° flexion and that primarily varus-valgus laxity would be affected near 90° flexion...
November 27, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29173554/biomechanics-of-the-anterolateral-structures-of-the-knee
#5
REVIEW
Christoph Kittl, Eivind Inderhaug, Andy Williams, Andrew A Amis
This article describes the complex anatomic structures that pass across the lateral aspect of the knee, particularly the iliotibial tract and the underlying anterolateral ligament and capsule. It provides data on their strength and roles in controlling tibiofemoral joint laxity and stability. These findings are discussed in relation to surgery to repair or reconstruct the anatomic structures, or to create tenodeses with similar effect.
January 2018: Clinics in Sports Medicine
https://www.readbyqxmd.com/read/29173550/the-role-of-an-extra-articular-tenodesis-in-revision-of-anterior-cruciate-ligament-reconstruction
#6
REVIEW
Thomas K Miller
Patients who present for anterior cruciate ligament (ACL) revision with a high-grade pivot shift at the time of an index ACL revision procedure and subsequent reconstruction failure or a high-grade pivot shift at revision surgery, patients with generalized joint laxity, and those requiring softs tissue grafts should be considered candidates for lateral tenodesis to supplement intraarticular graft revision. Although there is no consensus regarding the optimal lateral tenodesis technique, due to the tibial positioning associated with tensioning and fixation of extra-articular procedures, a lateral tenodesis should not be used in patients with posterolateral corner injuries or lateral compartment articular disease...
January 2018: Clinics in Sports Medicine
https://www.readbyqxmd.com/read/29164086/a-novel-missense-mutation-of-the-nsd1-gene-associated-with-overgrowth-in-three-generations-of-an-italian-family-case-report-differential-diagnosis-and-review-of-mutations-of-nsd1-gene-in-familial-sotos-syndrome
#7
Gianluigi Laccetta, Francesca Moscuzza, Angela Michelucci, Andrea Guzzetta, Sara Lunardi, Francesca Lorenzoni, Paolo Ghirri
Sotos syndrome (SoS) is characterized by overgrowth of prenatal onset, learning disability, and characteristic facial appearance; it is usually due to haploinsufficiency of NSD1 gene at chromosome 5q35. An Italian child was born at 37 weeks of gestation (weight 2,910 g, 25th-50th centiles; length 50 cm, 75th centile; head circumference 36 cm, 97th centile) showing cryptorchidism on the right side, hypertelorism, dolichocephaly, broad and prominent forehead, and narrow jaw; the pregnancy was worsened by maternal preeclampsia and gestational diabetes, and his mother had a previous history of four early miscarriages...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/29159731/effects-of-population-variability-on-knee-loading-during-simulated-human-gait
#8
Rebecca J Nesbitt, Nathaniel A Bates, Marepalli B Rao, Grant Schaffner, Jason T Shearn
Cadaveric simulation models allow researchers to study native tissues in situ. However, as tests are conducted using donor specimens with unmatched kinematics, techniques that impose population average motions are subject to deviation from true physiologic conditions. This study aimed to identify factors which explain the kinetic variability observed during robotic simulations of a single human gait motion using a sample of human cadaver knees. Twelve human cadaver limbs (58 ± 16 years) were subjected to tibiofemoral geometrical analysis and cyclical stiffness testing in each anatomical degree of freedom...
November 20, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29157249/biomechanical-study-of-isolated-radial-head-dislocation
#9
Naoki Hayami, Shohei Omokawa, Akio Iida, Jirachart Kraisarin, Hisao Moritomo, Pasuk Mahakkanukrauh, Takamasa Shimizu, Kenji Kawamura, Yasuhito Tanaka
BACKGROUND: Isolated radial head dislocation is a rare injury with an unclear pathomechanism, and the treatment is controversial. The purpose of the present study was to investigate the biomechanical contributions of the annular ligament, quadrate ligament, interosseous membrane, and annular ligament reconstructions to proximal radioulnar joint stability. METHODS: Five fresh frozen cadaveric upper extremities were amputated above the elbow and solidly fixed on a customized jig...
November 21, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29150746/correlation-between-quantitative-pivot-shift-and-generalized-joint-laxity-a-prospective-multicenter-study-of-acl-ruptures
#10
David Sundemo, Anna Blom, Yuichi Hoshino, Ryosuke Kuroda, Nicola Francesco Lopomo, Stefano Zaffagnini, Volker Musahl, James J Irrgang, Jón Karlsson, Kristian Samuelsson
PURPOSE: To investigate whether an increased magnitude of quantitative rotatory knee laxity is associated with a greater level of generalized joint laxity in ACL-injured and contralateral knees. METHODS: A total of 103 patients were enrolled across four international centers to undergo anatomic ACL reconstruction. Rotatory knee laxity was evaluated preoperatively, both in the awake state and under anesthesia, using the standardized pivot shift test. Two devices were used to quantify rotatory knee laxity; an inertial sensor, measuring the joint acceleration, and an image analysis system, measuring the lateral compartment translation of the tibia...
November 17, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29137900/the-posterior-capsular-ligamentous-complex-contributes-to-hip-joint-stability-in-distraction
#11
Masaki Takao, Yoshito Otake, Norio Fukuda, Yoshinobu Sato, Mehran Armand, Nobuhiko Sugano
BACKGROUND: Laxity of soft tissues after total hip arthroplasty is considered to be a cause of accelerated wear of bearing surfaces and dislocation. The purpose of this study is to assess the contribution of the anterior and posterior capsular ligamentous complexes and the short external rotators, except the quadratus femoris, on the stability of the hip against axial traction. METHODS: The study subjects comprised 7 fresh cadavers with 12 normal hip joints. In 6 hips, soft tissues surrounding the hip joint were resected in the following order to simulate the anterior approach: anterior capsule, posterior capsule, piriformis, conjoined tendon, and external obturator...
November 11, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29126427/a-murine-model-for-developmental-dysplasia-of-the-hip-ablation-of-cx3cr1-affects-acetabular-morphology-and-gait
#12
George Feldman, Arlene Offemaria, Hind Sawan, Javad Parvizi, Theresa A Freeman
BACKGROUND: Developmental dysplasia of the hip (DDH) is a debilitating condition whose distinguishing signs include incomplete formation of the acetabulum leading to dislocation of the femur, accelerated wear of the articular cartilage and joint laxity resulting in osteoarthritis. It is a complex disorder having environmental and genetic causes. Existing techniques fail to detect milder forms of DDH in newborns leading to hip osteoarthritis in young adults. A sensitive, specific and cost effective test would allow identification of newborns that could be non-invasively corrected by the use of a Pavlik harness...
November 10, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/29124362/arthroscopic-one-tunnel-transosseous-foveal-repair-for-triangular-fibrocartilage-complex-tfcc-peripheral-tear
#13
Ji Hun Park, Dongmin Kim, Jong Woong Park
PURPOSE: Arthroscopic repair of a peripheral triangular fibrocartilage complex (TFCC) tear is a promising, minimally invasive surgical technique, especially in patients with symptomatic distal radioulnar joint (DRUJ) instability. The purpose of this study was to evaluate the clinical result of arthroscopic one-tunnel transosseous foveal repair for peripheral TFCC tears. METHODS: Sixteen patients who underwent TFCC foveal repair were retrospectively evaluated. The mean follow-up period was 31...
November 9, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29115902/open-mouth-jaw-locking-in-cats-a-literature-review-and-use-of-computed-tomography-in-three-cases
#14
Anna E Nutt, Thomas Anderson, Margherita Gracis, Ivan Doran, Chris Warren-Smith, Sorrel J Langley-Hobbs
Case series summary This report summarises and reviews the published cases of open-mouth jaw locking in cats and describes three further cases. Case 1 was a 5-year-old, 5.3 kg male neutered domestic shorthair cat. CT identified changes consistent with temporomandibular joint (TMJ) dysplasia with osseous degenerative changes, and the cat subsequently underwent bilateral partial zygomectomy with bilateral partial coronoidectomy. Case 2 was a 10-year-old, 6.0 kg male neutered Exotic Shorthair. Aside from a fracture of the left maxillary canine tooth crown and absence of the left maxillary fourth premolar tooth, no abnormalities were found on CT scan...
November 1, 2017: Journal of Feline Medicine and Surgery
https://www.readbyqxmd.com/read/29104819/significance-of-scapholunate-gap-width-as-measured-by-probe-from-midcarpal
#15
Steffen Löw, Holger Erne, Ute Strobl, Frank Unglaub, Christian K Spies
Background  Geissler's classification is widely accepted in arthroscopic diagnostics of scapholunate (SL) ligament injury. Thereby, probe insertion into the SL gap from the midcarpal would indicate treatment necessity in patients with SL tear as seen from radiocarpal view. Purpose  In this review, the SL gap width, examined by the probe from midcarpal, was arthroscopically assessed in patients with intact SL ligaments, who were treated for ulnar impaction syndrome. The review examined how often lax SL joints can be found in patients with no complaints with respect to the SL ligaments and in which the SL ligaments were proven to be intact from radiocarpal view...
November 2017: Journal of Wrist Surgery
https://www.readbyqxmd.com/read/29078961/new-parameters-describing-how-knee-ligaments-carry-force-in-situ-predict-interspecimen-variations-in-laxity-during-simulated-clinical-exams
#16
Carl W Imhauser, Robert N Kent, James Boorman-Padgett, Ran Thein, Thomas L Wickiewicz, Andrew D Pearle
Knee laxity, defined as the net translation or rotation of the tibia relative to the femur in a given direction in response to an applied load, is highly variable from person to person. High levels of knee laxity as assessed during routine clinical exams are associated with first-time ligament injury and graft reinjury following reconstruction. During laxity exams, ligaments carry force to resist the applied load; however, relationships between intersubject variations in knee laxity and variations in how ligaments carry force as the knee moves through its passive envelope of motion, which we refer to as ligament engagement, are not well established...
October 7, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29048929/the-effect-of-hamstring-tendon-autograft-harvest-on-the-restoration-of-knee-stability-in-the-setting-of-concurrent-anterior-cruciate-ligament-and-medial-collateral-ligament-injuries
#17
Thomas J Kremen, Landon S Polakof, Sean S Rajaee, Trevor J Nelson, Melodie F Metzger
BACKGROUND: A hamstring autograft is commonly used in anterior cruciate ligament (ACL) reconstruction (ACLR); however, there is evidence to suggest that the tendons harvested may contribute to medial knee instability. HYPOTHESIS: We tested the hypothesis that the gracilis (G) and semitendinosus (ST) tendons significantly contribute to sagittal, coronal, and/or rotational knee stability in the setting of ACLR with a concurrent partial medial collateral ligament (MCL) injury...
October 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29037653/adolescent-idiopathic-scoliosis-the-tethered-spine-iii-is-fascial-spiral-the-key
#18
Lucy Whyte Ferguson
This article reports on an observational and treatment case series involving 22 adolescents and preadolescents treated over a 15 year period who had or appeared to be developing idiopathic scoliosis (IS). Common patterns of muscle and fascial asymmetry were observed and treated. Most of these individuals had spinal area pain and the trigger points (TrPs) apparently responsible for this pain were located in muscles at some distance from the spine, yet referred pain to locations throughout the thoracolumbar spine...
October 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28988877/intra-and-inter-observer-reproducibility-of-shoulder-laxity-tests-comparison-of-the-drawer-modified-drawer-and-load-and-shift-tests
#19
Wataru Morita, Atsushi Tasaki
BACKGROUND: Conventional tests of shoulder laxity have been shown to have poor reliability due to the difficulty in palpating the subtle movements of the shoulder joint beneath the musculature. Modified drawer test that is performed while the soft tissues surrounding the shoulder are loosened has been proposed to facilitate glenohumeral joint movement and improve reliability. We hypothesised that the modified drawer test would have an improved intra- and inter-observer reproducibility in comparison to the drawer and load and shift tests...
October 5, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28970125/medial-rather-than-lateral-knee-instability-correlates-with-inferior-patient-satisfaction-and-knee-function-after-total-knee-arthroplasty
#20
Hiroyuki Tsukiyama, Shinichi Kuriyama, Masahiko Kobayashi, Shinichiro Nakamura, Moritoshi Furu, Hiromu Ito, Shuichi Matsuda
BACKGROUND: It is commonly thought that balanced medial and lateral tibiofemoral joint gaps are essential, but the effect of joint laxity on clinical outcome after total knee arthroplasty (TKA) is unclear. It was hypothesised that medial joint laxity correlates with inferior patient satisfaction and knee function, although lateral joint laxity is allowed to a certain degree in TKA. METHODS: This study included 50 knees that underwent primary TKA. Knee laxity was measured with postoperative stress radiographs in flexion and extension, and patient satisfaction and knee function were evaluated by the 2011 Knee Society Knee Scoring System...
September 29, 2017: Knee
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