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medial collateral ligament

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https://www.readbyqxmd.com/read/29678397/varus-posteromedial-rotatory-instability-a-biomechanical-analysis-of-posterior-bundle-of-the-medial-ulnar-collateral-ligament-reconstruction
#1
Matthew J Gluck, Christina M Beck, Elan J Golan, Philip Nasser, Dave R Shukla, Michael R Hausman
BACKGROUND: Recently, there has been growing interest in the involvement of the posterior bundle of the medial ulnar collateral ligament (pMUCL) in varus posteromedial rotatory instability (PMRI). Varus PMRI has been observed clinically, but the degree of involvement of the pMUCL remains unclear. This study assessed the degree to which the pMUCL is involved in stabilizing the elbow and the feasibility of a pMUCL reconstruction to restore stability. METHODS: Movements simulating PMRI were performed in 8 cadaveric elbows...
April 17, 2018: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29678191/a-biomechanical-analysis-of-triangular-medial-knee-reconstruction
#2
Xiaomeng Wang, Huixin Liu, Guman Duan, Yingzhen Niu, Chang Liu, Fei Wang
BACKGROUND: The purpose of this study was to evaluate and compare knee kinematics and stability following either triangular or anatomical reconstruction of the superficial medial collateral ligament (sMCL) and posterior oblique ligament (POL). METHODS: In a cadaveric model (12 knees), the stability and kinematics following two experimental sMCL and POL reconstructions were compared in sMCL- and POL-deficient knees versus normal knees. The first reconstruction was a triangular reconstruction of the sMCL and POL, while the second involved an anatomical reconstruction of the sMCL and POL...
April 20, 2018: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29665801/an-extended-opensim-knee-model-for-analysis-of-strains-of-connective-tissues
#3
M Marieswaran, Arnab Sikidar, Anu Goel, Deepak Joshi, Dinesh Kalyanasundaram
BACKGROUND: OpenSim musculoskeletal models provide an accurate simulation environment that eases limitations of in vivo and in vitro studies. In this work, a biomechanical knee model was formulated with femoral articular cartilages and menisci along with 25 connective tissue bundles representing ligaments and capsules. The strain patterns of the connective tissues in the presence of femoral articular cartilage and menisci in the OpenSim knee model was probed in a first of its kind study...
April 17, 2018: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29662914/ligament-strain-response-between-lower-extremity-contralateral-pairs-during-in-vitro-landing-simulation
#4
April L McPherson, Nathanial A Bates, Nathan D Schilaty, Christopher V Nagelli, Aaron J Krych, Timothy E Hewett
Background: Limb asymmetries, as determined through in vivo biomechanical measures, are known risk factors for anterior cruciate ligament (ACL) injury. Previous cadaveric studies have shown a lack of significant differences in ligament strain between contralateral lower extremities when identical kinematics were simulated on specimens. Recent methodological developments have applied in vivo knee kinetics to exert landing forces on cadaveric lower extremities to mimic ACL injury events, but it is unknown whether contralateral limbs fail in a consistent manner during impact simulator testing...
April 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29662789/pie-crusting-technique-is-effective-and-safe-to-release-superficial-medial-collateral-ligament-for-total-knee-arthroplasty
#5
Xuan He, Hong Cai, Ke Zhang
Background: Pie-crusting technique is a damage-control soft tissue balance skill of total knee arthroplasty (TKA). The outcome of this technique to release lateral soft tissue is reasonable. A limited number of studies have focused on medial collateral ligament release with pie-crusting technique in the past years because of concerns about its efficacy and safety. Method: All cases underwent superficial medial collateral ligament (SMCL) release with either pie-crusting technique or traditional technique (39 knees in each group) between January 1, 2014 and August 31, 2015...
April 2018: Journal of Orthopaedic Translation
https://www.readbyqxmd.com/read/29661527/variability-in-elongation-and-failure-of-the-medial-collateral-ligament-after-pie-crusting-with-16-and-18-gauge-needles
#6
Spencer H Amundsen, Kathleen N Meyers, Timothy M Wright, Geoffrey H Westrich
BACKGROUND: In knee arthroplasty with preoperative varus deformity, medial collateral ligament (MCL) release may be needed to achieve balance. Pie-crusting allows for controlled release, but questions remain regarding its ability to obtain predictable results. We compared 16- vs18-gauge needle punctures and determined the number of punctures required to (1) lengthen the MCL by 1 mm and (2) cause ligament failure. METHODS: Thirteen knees were dissected, leaving the femur and tibia with an isolated MCL, and randomly assigned to 16- or 18-gauge groups...
March 17, 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29661110/alteration-of-gait-parameters-in-a-mouse-model-of-surgically-induced-knee-osteoarthritis
#7
Yuma Makii, Meiko Asaka, Susumu Setogawa, Soichiro Fujiki, Yoko Hosaka, Fumiko Yano, Hiroyuki Oka, Sakae Tanaka, Naoshi Fukui, Dai Yanagihara, Taku Saito
PURPOSE: Joint pain is the most common symptom of osteoarthritis (OA); however, its mechanism remains unclarified. The present study investigated hindlimb motion during locomotion on the treadmill using a three-dimensional (3D) motion analysis system with high-speed cameras to evaluate whether this method can be used as an indication of joint pain in a mouse model of surgically induced OA. METHODS: We resected the medial meniscus and medial collateral ligament in 8-week old C57BL/6 male mice and performed locomotion recording 6 months post-operatively...
May 2018: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/29660790/development-of-a-tissue-engineered-artificial-ligament-reconstruction-of-injured-rabbit-medial-collateral-ligament-with-elastin-collagen-and-ligament-cell-composite-artificial-ligament
#8
Masaki Hirukawa, Shingo Katayama, Tatsuya Sato, Kota Inoue, Kosuke Niwa, Naoya Ito, Tetsuya Hattori, Takashi Hosoi, Hironori Unno, Yoshiaki Suzuki, Masahiro Hasegawa, Keiichi Miyamoto, Takashi Horiuchi
Ligament reconstruction using a tissue-engineered artificial ligament (TEAL) requires regeneration of the ligament-bone junction such that fixation devices such as screws and end buttons do not have to be used. The objective of this study was to develop a TEAL consisting of elastin-coated polydioxanone (PDS) sutures covered with elastin and collagen fibers preseeded with ligament cells. In a pilot study, a ring-type PDS suture with a 2.5 mm (width) bone insertion was constructed with/without elastin coating (Ela-coat and Non-coat) and implanted into two bone tunnels, diameter 2...
April 16, 2018: Artificial Organs
https://www.readbyqxmd.com/read/29659299/low-1-year-return-to-sport-rate-after-anterior-cruciate-ligament-reconstruction-regardless-of-patient-and-surgical-factors-a-prospective-cohort-study-of-272-patients
#9
Eric Hamrin Senorski, Eleonor Svantesson, Susanne Beischer, Christoffer Thomeé, Roland Thomeé, Jón Karlsson, Kristian Samuelsson
BACKGROUND: There is insufficient knowledge about the way that concomitant injuries affect the short-term likelihood of a return to a knee-strenuous sport after anterior cruciate ligament (ACL) reconstruction. Hypotheses/Purpose: The purpose was to study whether patient characteristics, concomitant injuries, and graft choice at primary ACL reconstruction can predict return to sport (RTS) 1 year after surgery. The hypotheses were that younger age at the time of ACL reconstruction would positively affect RTS, while the presence of concomitant injuries would negatively affect RTS 1 year after surgery...
April 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29653444/effect-of-the-distal-femoral-joint-line-on-ligament-tensions-in-flexion-with-cruciate-retaining-total-knee-prostheses
#10
Rajkishen Narayanan, Nathaniel Lenz, Jordan Alexander Werner, Michael B Cross, Dean Hughes, Scott Laster, Ran Schwarzkopf
Proper ligament tension in knee flexion within cruciate-retaining (CR) total knee arthroplasty has long been associated with clinical success; however, traditional balancing principles have assumed that the distal femoral joint line (DFJL) affects only extension. The purpose of this study was to determine the effect DFJL may have on ligament strains and tibiofemoral kinematics of CR knee designs in flexion. A computational analysis was performed using a musculoskeletal modeling system for two different knee implants, the high-flex CR (HFCR) and guided-motion CR (GMCR)...
April 13, 2018: Journal of Knee Surgery
https://www.readbyqxmd.com/read/29629916/distal-femoral-varus-osteotomy-for-the-management-of-valgus-deformity-of-the-knee
#11
Seth L Sherman, Samuel F Thompson, John C F Clohisy
Distal femoral varus osteotomy is a well-described treatment option for patients with valgus malalignment associated with a variety of underlying conditions. This procedure may be the definitive treatment option in active patients with isolated lateral compartment osteoarthritis or posttraumatic arthritis. It may be a useful concomitant procedure in young patients with lateral meniscus deficiency, focal chondral defects, chronic medial collateral ligament insufficiency, and/or patellofemoral instability. Distal femoral varus osteotomy can be performed with medial closing wedge or lateral opening wedge techniques...
April 6, 2018: Journal of the American Academy of Orthopaedic Surgeons
https://www.readbyqxmd.com/read/29623377/the-increase-in-posterior-tibial-slope-provides-a-positive-biomechanical-effect-in-posterior-stabilized-total-knee-arthroplasty
#12
Kyoung-Tak Kang, Sae Kwang Kwon, Juhyun Son, Oh-Ryong Kwon, Jun-Sang Lee, Yong-Gon Koh
PURPOSE: This study aims to clarify the influence of the posterior tibial slope (PTS) on knee joint biomechanics after posterior-stabilized (PS) total knee arthroplasty (TKA) using a computer simulation. METHODS: A validated TKA computational model was used to evaluate and quantify the effects of an increased PTS. In order to conduct a squat simulation, models with a - 3° to 15° PTS using increments of 3° were developed. Forces on the quadriceps and collateral ligament, a tibial posterior translation, contact point on a polyethylene (PE) insert, and contact stress on the patellofemoral (PF) joint and post in a PE insert were compared...
April 5, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29619398/functional-classification-of-the-medial-ulnar-collateral-ligament-an-in-vivo-kinematic-study-with-computer-aided-design
#13
Erica Kholinne, Rizki Fajar Zulkarnain, Hyun-Joo Lee, Arnold Adikrishna, In-Ho Jeon
Background: It has been widely accepted that the anterior and posterior bundles of the medial ulnar collateral ligament (MUCL) tighten at extension and flexion, respectively. However, this belief is based on anatomic data acquired from cadaveric studies. The advancement of 3-dimensional (3D) model technology has made possible the simulation of dynamic movement that includes each ligament bundle fiber to analyze its functional properties. To date, no study has analyzed ligament kinematics at the level of the fibers while also focusing on their functional properties...
March 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29613925/determination-of-elbow-laxity-in-a-sequential-soft-tissue-injury-model-a-cadaveric-study
#14
Marc Schnetzke, Moritz Bergmann, Kilian Wegmann, Lars-Peter Müller, Stephan Grechenig, Paul-Alfred Grützner, Thorsten Guehring
BACKGROUND: The objective of our study was to analyze, under fluoroscopy, joint angulation of uninjured elbows and elbows with distinct induced collateral ligament injury. METHODS: Twelve elbow specimens were tested for varus and valgus joint angulation using 4 different examination methods (application of both varus and valgus stress by each of 2 examiners [Examiner 1 and Examiner 2] and application of 1 and 2 Nm of torque using a calibrated electric force scale) in 4 elbow positions (in full extension with 90° of supination and 90° of pronation, and in 30° of flexion with 90° of supination and 90° of pronation)...
April 4, 2018: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/29601208/performance-and-return-to-sport-after-tommy-john-surgery-among-major-league-baseball-position-players
#15
Robert A Jack, Matthew B Burn, Kyle R Sochacki, Patrick C McCulloch, David M Lintner, Joshua D Harris
BACKGROUND: The anterior bundle of the medial ulnar collateral ligament (UCL) is the primary restraint to valgus stress at the elbow and is often injured among overhead throwing athletes. Despite prevention strategies, injuries to the elbow UCL are on the rise. PURPOSE: To determine (1) the return-to-sport (RTS) rate of Major League Baseball (MLB) position players after elbow medial UCL reconstruction, (2) postoperative career length and games per season, (3) pre- and postoperative performance, (4) postoperative performance versus matched control players, and (5) whether position players changed positions after UCL reconstruction...
March 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29578869/orthopedic-injuries-in-professional-surfers-a-retrospective-study-at-a-single-orthopedic-center
#16
Eric Hohn, Sean Robinson, Jarrad Merriman, Robin Parrish, Warren Kramer
BACKGROUND: Literature regarding surfing injuries is scarce and most studies report a high number of minor injuries. Recent literature suggests that musculoskeletal injuries are more common than previously reported. In the mid 2000s, competitive surfing has seen an increase in aerial maneuvers, as they have become more highly rewarded by the judging panel, which may be contributing to a change in injury patterns. Our goal was to evaluate orthopedic injuries in professional surfers. HYPOTHESIS: Orthopedic injuries in professional surfers are diverse and have evolved with skill and technology...
March 23, 2018: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29578473/medial-collateral-ligament-bursitis-in-a-patient-with-knee-osteoarthritis
#17
Hakan Nur, Ayca Aytekin, Erdal Gilgil
BACKGROUND: Medial collateral ligament (MCL) bursitis has been described as a distended and inflamed bursa between the superficial and deep portions of the MCL. It is a rare but important cause of medial knee pain. CASE DESCRIPTION: A 65-year-old woman with knee osteoarthritis (OA) presented with severe pain and swelling in her left knee. She didn't have a traumatic injury. After a clinical examination, a slight decrease in the range of motion of the left knee, and a painful swelling and tenderness over the medial side of the knee and proximal tibia were detected...
March 16, 2018: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/29576338/following-ulnar-collateral-ligament-reconstruction-professional-baseball-position-players-return-to-play-faster-than-pitchers-but-catchers-return-less-frequently
#18
Christopher L Camp, Stan Conte, John D'Angelo, Stephen A Fealy
BACKGROUND: Although much as been done to characterize trends of medial ulnar collateral ligament (UCL) reconstruction in pitchers, outcomes in position players (PPs) (non-pitchers) remain undefined in the current literature. METHODS: Three resources were combined to identify all known Major League Baseball and Minor League Baseball (MiLB) PPs who have ever undergone UCL reconstruction. A multitude of player and surgical variables were included. Trends over time were analyzed collectively, based on level of play, revision status (primary vs revision), and position...
March 23, 2018: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29570751/applying-a-hybrid-experimental-computational-technique-to-study-elbow-joint-ligamentous-stabilizers
#19
Danial Sharifi Kia, Ryan Willing
Much of our understanding of the role of elbow ligaments to overall joint biomechanics has been developed through in vitro cadaver studies using joint motion simulators. The principle of superposition can be used to indirectly compute the force contributions of ligaments during prescribed motions. Previous studies have analyzed the contribution of different soft tissue structures to the stability of human elbow joints, but have limitations in evaluating the loads sustained by those tissues. This manuscript introduces a unique, hybrid experimental-computational technique for measuring and simulating the biomechanical contributions of ligaments to elbow joint kinematics and stability...
March 21, 2018: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29569702/an-anatomical-study-of-the-origin-structure-and-insertion-of-the-medial-patellofemoral-ligament
#20
Chang-Hui Li, David Ricketts, Xi-Shan Wang, Teng-Bo Yu, Chao Qi, Yong-Le Zhu
BACKGROUND: Repair and reconstruction of the medial patellofemoral ligament (MPFL) has been undertaken for the treatment of patellar instability. For successful surgery detailed knowledge of the anatomy of the ligament is required. The aim of this study was to describe the origin, structure and insertion of the MPFL. MATERIALS AND METHODS: We studied cadaveric knees from 30 Chinese adults. We studied the origin, course and insertion of the MPFL. RESULTS: We found that the MPFL was composed of two main strands, superficial and deep...
March 23, 2018: Folia Morphologica (Warsz)
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