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https://www.readbyqxmd.com/read/28814027/challenges-in-using-compliant-ligaments-for-position-estimation-within-robotic-joints
#1
Felix Russell, Lei Gao, Peter Ellison, Ravi Vaidyanathan
The mechanical advantages of bio-inspired condylar robotic knee joints for use in prosthetics or rehabilitation has been argued extensively in literature. A common limitation of these designs is the difficulty of estimating joint angle and therefore accurately controlling the joint. Furthermore, the potential role of ligament-like structures in robotic knees is not very well established. In this work, we investigate the role of compliant stretch sensing ligaments and their integration into a condylar robotic knee...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813844/soft-stop-knee-brace-for-rehabilitation-from-ligament-injuries-design-and-pilot-trial
#2
James R J Greenfield, Haram Francis Hwang, Claire Davies, Andrew J McDaid
Ligaments within the human knee are commonly torn or injured as a result of sports that involve sharp direction changes, pivoting and landing. For this reason, athletes are often side-lined from their respective sports for up to 18 months after injury to rehabilitate. As part of the rehabilitation process, knee braces are often prescribed in an attempt to decrease the recovery period of the injured individual by restraining and minimizing the motion at the knee. However, the true efficacy of knee bracing is yet to be fully evaluated as studies show mixed results to whether braces actually decrease the rehabilitation period for patients...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28812037/a-retrospective-analysis-of-concurrent-pathology-in-acl-reconstructed-knees-of-elite-alpine-ski-racers
#3
Matthew J Jordan, Patricia Doyle-Baker, Mark Heard, Per Aagaard, Walter Herzog
BACKGROUND: Anterior cruciate ligament (ACL) tear is the most frequent injury in alpine ski racing, and there is a high prevalence of ACL reinjury. Limited data exist on the concurrent pathology with primary ACL tears in elite alpine ski racers and the magnitude of injury progression after primary ACL reconstruction (ACLR). PURPOSE: To evaluate (1) the involvement of intra-articular and multiligament pathologies at the time of primary ACLR, (2) the subsequent progression in meniscal/chondral injuries, and (3) the occurrence of ACL reinjury in elite alpine ski racers...
July 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28810991/posterior-cruciate-ligament-injuries-associated-with-military-survival-swim-training
#4
Michael S Crowell, John S Mason, Matthew A Posner, Chad A Haley
OBJECTIVES: Posterior cruciate ligament (PCL) injuries are relatively common injuries associated with athletic activities and high-energy trauma. Posterolateral corner (PLC) injuries frequently accompany injury to the PCL. Diagnosis can be challenging and requires a comprehensive history and physical examination. Patients frequently report vague, nonspecific symptoms and the mechanism of injury is often useful in localizing injured structures. Two of the more common mechanisms for PCL injury include a direct blow to the proximal anterior tibia with the knee flexed, as well as a significant knee hyperextension injury...
July 2017: Military Medicine
https://www.readbyqxmd.com/read/28810851/chitosan-in-viscosupplementation-in-vivo-effect-on-rabbit-subchondral-bone
#5
R Rieger, C Boulocher, S Kaderli, T Hoc
BACKGROUND: To investigate the effect of intra-articular injection of Chitosan (Cs) added to hyaluronic acid (HA) on subchondral bone during osteoarthritis (OA), microarchitectural parameters and mineral density were measured in a rabbit model of early OA. A novel hybrid hydrogel adding reacetylated Cs of fungal origin to HA was compared to high molecular weight HA commercial formulation. METHOD: Eighteen rabbits underwent unilateral anterior cruciate ligament transection (ACLT) and were divided into three groups (Saline-group, HA-group and Hybrid-group) depending on the intra-articular injection compound...
August 15, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28809636/-arthroscopic-finding-of-knee-joint-in-relation-to-age-and-its-comparison-with-pre-operative-clinical-finding-a-retrospective-study
#6
P Látal, K Šimeček, M Kloub
PURPOSE OF THE STUDY In the retrospective study of two South Bohemian centres we present the comparison of pre-operative anamnestic clinical signs in relation to the arthroscopic intraoperative finding. The obtained data is used also to evaluate the arthroscopic finding in relation to age and sex. MATERIAL AND METHODS The arthroscopic findings of patients who underwent surgery in 2013-2014 period (1.1.2013-31.12.2014) at the Department of Trauma Surgery of České Budějovice Hospital, a.s. and in 2014 (1.1...
2017: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
https://www.readbyqxmd.com/read/28809627/-the-use-of-btb-allograft-in-revision-reconstruction-of-the-anterior-cruciate-ligament-and-its-success-rate-in-terms-of-subjective-patient-satisfaction
#7
J Sklenský, P Vališ, M Repko, M Rouchal, M Maršálek, D Hrůzová
PURPOSE OF THE STUDY A retrospective evaluation of the success rate of revision ACL reconstruction performed using BTB allograft in terms of the life expectancy of the procedure up to and over five years from surgery. MATERIAL AND METHODS Over a ten-year period, from 2003 to 2013, we performed 47 revision ACL reconstruction surgeries. The majority of the primary ACL reconstructions using BTB autografts were not performed at our site. The group observed included 16 women (34%) and 31 men (66%). The women were aged between 25 and 48 years, the median age being 32...
2017: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
https://www.readbyqxmd.com/read/28808754/three-dimensionalct-analysis-of-femoral-tunnel-position-after-acl-reconstruction-a-prospective-study-of-one-hundred-and-thirty-five-cases
#8
Olivier Reynaud, Cécile Batailler, Timothy Lording, Sebastien Lustig, Elvire Servien, Philippe Neyret
BACKGROUND: One of the principal causes for failure of anterior cruciate ligament reconstruction (ACL) is femoral tunnel mal-position. Several studies compare the position of femoral tunnels achieved with various techniques, with small series and using a quadrant assessment method. QUESTIONS: (1) What is the incidence of anatomical positioning of the intra-articular femoral tunnel aperture in primary ACL reconstruction in a university knee surgery? (2) What are the main errors in positioning? METHODS: 3D-CT scans were performed after primary ACL reconstruction in 135 consecutive cases...
August 14, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28808736/the-role-of-isolated-posterior-cruciate-ligament-reconstruction-in-knees-with-combined-posterior-cruciate-ligament-and-posterolateral-complex-injury
#9
REVIEW
Dong-Yeong Lee, Young-Jin Park, Dong-Hee Kim, Hyun-Jung Kim, Dae-Cheol Nam, Jin-Sung Park, Sun-Chul Hwang
PURPOSE: This is a meta-analysis comparing biomechanical outcomes to determine whether an isolated posterior cruciate ligament (PCL) reconstruction can restore normal knee kinematics in a combined PCL/posterolateral complex (PLC) injury and whether double-bundle (DB) PCL reconstruction is superior in controlling posterior and rotational laxity compared with single-bundle (SB) PCL reconstruction in a PCL/PLC-deficient knee. METHODS: A number of electronic databases were searched for relevant articles published through August 2016 that compared biomechanical outcomes of PCL reconstruction in patients who underwent reconstruction for combined PCL/PLC deficiencies...
August 14, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28807564/reduced-metallic-artefacts-in-3%C3%A2-t-knee-mri-using-fast-spin-echo-multi-point-dixon-compared-to-fast-spin-echo-t2-weighted-sequences
#10
H J Park, S Y Lee, S H Choi, H P Hong, Y J Choi, M S Kim
AIM: To compare multi-point Dixon magnetic resonance imaging (MRI) and fast spin-echo (FSE) T2-weighted imaging (WI) with regard to the size of metallic artefacts when imaging the knee joint. MATERIALS AND METHODS: A total of 42 patients who underwent anterior cruciate ligament (ACL) reconstruction and follow-up imaging with 3 T MRI using the multi-point Dixon technique was included in this retrospective study. The maximal distance of the image distortion area around the metallic artefact was measured (interference screw of femoral tunnel area) on sagittal images of both FSE T2WI (T2WI and fat-suppressed [FS] T2WI) and multi-point Dixon (water only image and in-phase image) sequences...
August 11, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28806411/cross-sectional-area-of-the-femoral-vein-varies-with-leg-position-and-distance-from-the-inguinal-ligament
#11
Dorota Czyzewska, Andrzej Ustymowicz, Radoslaw Kowalewski, Anna Zurada, Jaroslaw Krejza
PURPOSE: The risk of complications associated with femoral venous catheterization could be potentially reduced if the procedure was performed at the location where the cross-sectional area (CSA) of the vessel is the largest. The diameter of the femoral vein depends on leg position as well as the distance from the inguinal ligament. We determined the CSA of the right femoral vein in three different leg positions at two distances from the inguinal ligament. SUBJECTS AND METHODS: Informed consent was given by 205 healthy volunteers aged 19-39 years, mean: 23±3 years (108 women, 97 men)...
2017: PloS One
https://www.readbyqxmd.com/read/28806096/results-of-anterior-cruciate-ligament-reconstruction-with-patellar-tendon-autografts-objective-factors-associated-with-the-development-of-osteoarthritis-at-20-to-33-years-after-surgery
#12
K Donald Shelbourne, Rodney W Benner, Tinker Gray
BACKGROUND: Few studies exist that report objective radiographic and physical examination results at >20 years after anterior cruciate ligament (ACL) reconstruction. HYPOTHESIS: The risk of osteoarthritis (OA) at >20 years after surgery would be statistically significantly higher if an increased severity of factors was present. STUDY DESIGN: Cohort study; Level of evidence, 2. METHODS: Between 1982 and 1994, 1428 knees met the inclusion criteria of being primary ACL surgery, having no existing OA or other ligamentous laxity, and having no known graft tear...
August 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28805136/the-ovine-model-for-meniscus-tissue-engineering-considerations-of-anatomy-function-implantation-and-evaluation
#13
Andrzej Brzezinski, Salim A Ghodbane, Jay M Patel, Barbara A Perry, Charles J Gatt, Michael G Dunn
Meniscus injuries represent one of the most-common intra-articular knee injuries. The current treatment options include meniscectomy and allograft transplantation, both with poor long-term outcomes. Therefore, there is a need for regenerative techniques to restore meniscal function. In order to pre-clinically test scaffolds for meniscus replacement, large-animal models need to be established and standardized. This review establishes the anatomical and compositional similarities between the human and sheep menisci and provides guidance for implantation and evaluation of such devices...
August 12, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28804728/relationships-of-muscle-function-and-subjective-knee-function-in-patients-after-acl-reconstruction
#14
Stephan Bodkin, John Goetschius, Jay Hertel, Joe Hart
BACKGROUND: After anterior cruciate ligament reconstruction (ACLR), relationships between objective measures of muscle function and patient-reported outcomes may change over time. Examining these measures at different time frames after surgery may help develop individualized approaches to improve post-ALCR analysis. PURPOSE: To examine the associations between subjective knee function and lower-extremity muscle function in individual patients at various time points after ACLR...
July 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28803035/bone-tunnel-change-develops-within-two-weeks-of-double-bundle-anterior-cruciate-ligament-reconstruction-using-hamstring-autograft-a-comparison-of-different-postoperative-immobilization-periods-using-computed-tomography
#15
Ryo Shimizu, Nobuo Adachi, Minoru Ishifuro, Atsuo Nakamae, Masakazu Ishikawa, Masataka Deie, Mitsuo Ochi
BACKGROUND: The purpose of this study was to evaluate bone tunnel changes following anterior cruciate ligament (ACL) reconstruction during the early postoperative period using computed tomography (CT), and to understand the impact of postoperative immobilization on these changes. METHODS: Twenty patients who underwent double-bundle ACL reconstruction using hamstring tendon autografts were included. We subcategorized patients into two groups: patients who underwent isolated ACL reconstruction and had three days of knee immobilization (Group A, n=10); and patients with concomitant meniscus injuries who underwent ACL reconstruction and meniscus repair simultaneously (Group B, n=10) had their knees immobilized for two weeks after surgery...
August 9, 2017: Knee
https://www.readbyqxmd.com/read/28802742/the-challenges-of-measuring-in-vivo-knee-collateral-ligament-strains-using-ultrasound
#16
Laura C Slane, Josh A Slane, Jan D'hooge, Lennart Scheys
Ultrasound-based methods have shown promise in their ability to characterize non-uniform deformations in large energy-storing tendons such as the Achilles and patellar tendons, yet applications to other areas of the body have been largely unexplored. The noninvasive quantification of collateral ligament strain could provide an important clinical metric of knee frontal plane stability, which is relevant in ligament injury and for measuring outcomes following total knee arthroplasty. In this pilot cadaveric experiment, we investigated the possibility of measuring collateral ligament strain with our previously validated speckle-tracking approach, but encountered a number of challenges during both data acquisition and processing...
July 31, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28802422/management-of-neglected-acl-avulsion-fractures-a-case-series-and-systematic-review
#17
D K Chouhan, M S Dhillon, R John, A Khurana
INTRODUCTION: Neglected tibial eminence avulsion fractures of the anterior cruciate ligament (ACL) are uncommonly seen in modern times, but are fairly common due to a missed diagnosis/mismanagement in developing countries. OBJECTIVES: To determine the outcomes after open reduction and internal fixation of late presenting ACL avulsion fractures, and to review the literature for similar cases, in an attempt to evaluate the ideal surgical management in this unique scenario...
August 2017: Injury
https://www.readbyqxmd.com/read/28802221/in-vivo-mechanical-behaviour-of-the-anterior-cruciate-ligament-a-study-of-six-daily-and-high-impact-activities
#18
Elisa Roldán, Neil D Reeves, Glen Cooper, Kirstie Andrews
The anterior cruciate ligament (ACL) plays a key role in the stability of the knee joint restricting the rotation and anterior tibial translation. However, there is a lack of knowledge of the in vivo ACL mechanical behaviour during high impact manoeuvres. The motion of 12 young participants with healthy knees was captured while they performed the following activities: walking, running, cross-over cutting, sidestep cutting, jumping and jumping with one leg. The in vivo ACL length and strain were estimated using experimental kinematic data and three degree of freedom (DOF) knee model...
August 1, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28801826/brain-activity-changes-in-somatosensory-and-emotion-related-areas-with-medial-patellofemoral-ligament-deficiency
#19
Masaru Kadowaki, Taku Tadenuma, Nobuyuki Kumahashi, Yuji Uchio
BACKGROUND: Patellar instability with medial patellofemoral ligament (MPFL) deficiency is a common sports injury among young people. Although nonoperative and surgical treatment can provide stability of the patella, patients often have anxiety related to the knee. We speculate that neural dysfunction may be related to anxiety in these patients; however, the mechanism in the brain that generates this anxiety remains unknown. QUESTIONS/PURPOSES: (1) How does brain activity in patients with MPFL deficiency change in the areas related to somatic sensation against lateral shift of the patella? (2) How does patella instability, which can lead to continuous fear or apprehension for dislocation, influence brain activity in the areas related to emotion? METHODS: Nineteen patients with MPFL deficiency underwent surgical reconstruction in our hospital from April 2012 to March 2014...
August 11, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28801704/no-clinical-differences-between-anteromedial-portal-and-transtibial-technique-for-femoral-tunnel-positioning-in-anterior-cruciate-ligament-reconstruction-a-prospective-randomized-controlled-trial
#20
Peter MacDonald, Chris Kim, Sheila McRae, Jeff Leiter, Ryan Khan, Daniel Whelan
PURPOSE: The anteromedial (AMP) portal technique was introduced to position the femoral tunnel in anterior cruciate ligament (ACL) reconstruction to more closely replicate the original ACL footprint compared to the transtibial (TT) approach. Few randomized trials have evaluated differences in these techniques with respect to clinical outcomes. The purpose of this study was to determine if there are any differences in clinical outcome between the AMP and TT approaches. METHODS: This is a single-blinded, prospective, randomized controlled trial...
August 11, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
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