561 results match your criteria medial offset


The influence of posterior tibial slope on the mid-term clinical effect of medial-pivot knee prosthesis.

J Orthop Surg Res 2021 Sep 15;16(1):563. Epub 2021 Sep 15.

Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, No. 59, Haier Road, Qingdao, 266000, China.

Objective: To evaluate the effect of posterior tibial slope (PTS) on the mid-term clinical outcome following a medial-pivot (MP) prosthesis.

Method: Two hundred thirty-three patients from The Affiliated Hospital of Qingdao University, who had undergone a total knee arthroplasty (TKA) with MP prosthesis between January 2015 and December 2015, were retrospectively included in this study. They were divided into 3 groups according to postoperative PTS: A ≤ 5°; B 5-7°; and C ≥ 7°. Read More

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September 2021

EMG Based Analysis of Gait Symmetry in Healthy Children.

Sensors (Basel) 2021 Sep 6;21(17). Epub 2021 Sep 6.

Department of Rehabilitation, Physical and Sports Medicine, Health Science Institute, Faculty of Medicine, Vilnius University, 03101 Vilnius, Lithuania.

The purpose of this study was to examine the changes in muscular activity between the left and right lower legs during gait in healthy children throughout temporal parameters of EMG and symmetry index (). A total of 17 healthy children (age: 8.06 ± 1. Read More

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September 2021

Improved prospective frequency correction for macromolecule-suppressed GABA editing with metabolite cycling at 3T.

Magn Reson Med 2021 Aug 25. Epub 2021 Aug 25.

Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas, USA.

Purpose: To combine metabolite cycling with J-difference editing (MC MEGA) to allow for prospective frequency correction at each transient without additional acquisitions and compare it to water-suppressed MEGA-PRESS (WS MEGA) editing with intermittent prospective frequency correction.

Methods: Macromolecule-suppressed gamma aminobutyric acid (GABA)-edited experiments were performed in a phantom and in the occipital lobe (OCC) (n = 12) and medial prefrontal cortex (mPFC) (n = 8) of the human brain. Water frequency consistency and average offset over acquisition time were compared. Read More

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Mismatch between Conventional Femoral Arthroplasty Stems and Hip Morphology in the Elderly Chinese Hip Fracture Population.

Authors:
Jwx Siow Ebk Kwek

Malays Orthop J 2021 Jul;15(2):101-106

Department of Orthopaedic Surgery, Woodlands Health Campus, Singapore.

Introduction: The morphology of the proximal femur differs in various populations. Based on our clinical experience, conventional femoral stems used in hip arthroplasty do not fit the Chinese population well. Hence, this study aims to evaluate the suitability of conventional femoral stems in the elderly Chinese hip fracture population requiring hip arthroplasty and to establish if gender and age related differences exist within this population. Read More

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Lateralized versus nonlateralized reverse total shoulder arthroplasty.

Shoulder Elbow 2021 Aug 9;13(4):358-370. Epub 2020 Jul 9.

Orthopaedic Surgery Department, University of Alexandria, El-Hadara University Hospital, Alexandria, Egypt.

Throughout the history of reverse total shoulder arthroplasty, the extent of lateral offset has changed considerably from "too lateral" to "too medial" and has been lately swinging back towards a point somewhere in between. Nonlateralized designs minimize shear forces on the glenoid and decrease force required by the deltoid. Glenoid lateralization decreases impingement and scapular notching and improves range of motion. Read More

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Transpatellar bone tunnels perforating the lateral or anterior cortex increase the risk of patellar fracture in MPFL reconstruction: a finite element analysis and survey of the International Patellofemoral Study Group.

Knee Surg Sports Traumatol Arthrosc 2021 Jul 31. Epub 2021 Jul 31.

Orthofocus, Guggenbichlerstrasse 20, 5026, Salzburg, Austria.

Purpose: (1) To determine applied patellar drilling techniques for medial patellofemoral ligament (MPFL) reconstruction among members of the International Patellofemoral Study Group (IPSG) and (2) to evaluate the risk of patellar fracture for various patellar bone tunnel locations based on a finite element analysis (FEA) model.

Methods: In the first part of the study, an online survey on current MPFL reconstruction techniques was conducted among members of the IPSG. In the second part of the study, a three-dimensional FEA model of a healthy knee joint was created using a computed tomography scan. Read More

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Fixation Strength of Modified Iliac Screw Trajectory Compared to Traditional Iliac and S2 Alar-Iliac Trajectories: A Cadaveric Study.

World Neurosurg 2021 Jul 21. Epub 2021 Jul 21.

Swedish Neuroscience Institute, Swedish Medical Center, Seattle, Washington, USA.

Objective: Traditional iliac (TI) screws require extensive dissection, involve offset-connectors, and have prominent screw heads that may cause patient discomfort. S2 alar-iliac (S2AI) screws require less dissection, do not need offset connectors, and are less prominent. However, the biomechanical consequences of S2AI screws crossing the alar-iliac joint is unknown. Read More

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FOOT ALIGNMENT IN SYMPTOMATIC NATIONAL FOOTBALL LEAGUE (NFL) ATHLETES: A WEIGHTBEARING CT ANALYSIS.

Acta Ortop Bras 2021 May-Jun;29(3):118-123

Hospital for Special Surgery, Department of Orthopedics, Foot and Ankle Surgery, New York, NY, United States of America.

Objective: Our aim was to describe the foot alignment in National Football League (NFL) players with different symptomatic foot and ankle pathologies using weightbearing cone-beam computed tomography (WBCBCT), comparing them to normally aligned feet as control group.

Methods: 41 feet (36 active NFL players) were assessed using WBCBCT and compared to 20 normally aligned controls from a normal population. Measurements included: Foot and Ankle Offset (FAO); Calcaneal Offset (CO); Hindfoot Alignment Angle (HAA); angle between inferior and superior facets of the talus (Inftal-Suptal); angle between inferior facet of the talus and the horizontal/floor (Inftal-Hor); Forefoot Arch Angle (FAA); navicular- and medial cuneiform-to-floor distance. Read More

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Short stem hip arthroplasty via the minimally invasive direct anterior approach.

Oper Orthop Traumatol 2021 Aug 12;33(4):288-303. Epub 2021 Jul 12.

Department of Orthopaedic Surgery, University of Wuerzburg, Koenig-Ludwig-Haus, Brettreichstr. 11, 97074, Wuerzburg, Germany.

Objective: Tissue-sparing, minimally invasive hip arthroplasty via the direct anterior approach (DAA) using a partially neck-preserving, calcar-guided short stem.

Indications: Primary and secondary osteoarthritis of the hip due to developmental dysplasia, femoroacetabular impingement, femoral head necrosis or trauma sequelae.

Contraindications: Severe osteoporosis, active infection, American Society of Anesthesiologists (ASA) > III, large metaphyseal bone defects, severe metaphyseal deformities, Dorr type C femur. Read More

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Thigh muscle activation patterns and dynamic knee valgus at peak ground reaction force during drop jump landings: Reliability, youth competitive alpine skiing-specific reference values and relation to knee overuse complaints.

J Sci Med Sport 2021 Jun 17. Epub 2021 Jun 17.

Sports Medical Research Group, Department of Orthopaedics, Balgrist University Hospital, University of Zurich, Switzerland; University Centre for Prevention and Sports Medicine, Department of Orthopaedics, Balgrist University Hospital, University of Zurich, Switzerland; Motion Analysis Zurich, Department of Orthopaedics, Balgrist University Hospital, University of Zurich, Switzerland. Electronic address:

Objectives: (1) To evaluate the reliability of quantifying thigh muscle activation patterns and dynamic knee valgus during drop jump landings, (2) to provide reference values for female and male youth alpine skiers, and (3) to study their associations with age, anthropometrics, biological maturation and knee overuse complaints.

Design: Cross-sectional biomechanical experiment including questionnaires.

Methods: One hundred fourteen skiers of the under 16 category (main experiment) and twelve healthy participants (reliability experiment) volunteered. Read More

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Comparison of continuous sampling with active noise cancelation and sparse sampling for cortical and subcortical auditory functional MRI.

Magn Reson Med 2021 Jul 1. Epub 2021 Jul 1.

Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, United Kingdom.

Purpose: Detecting sound-related activity using functional MRI requires the auditory stimulus to be more salient than the intense background scanner acoustic noise. Various strategies can reduce the impact of scanner acoustic noise, including "sparse" temporal sampling with single/clustered acquisitions providing intervals without any background scanner acoustic noise, or active noise cancelation (ANC) during "continuous" temporal sampling, which generates an acoustic signal that adds destructively to the scanner acoustic noise, substantially reducing the acoustic energy at the participant's eardrum. Furthermore, multiband functional MRI allows multiple slices to be collected simultaneously, thereby reducing scanner acoustic noise in a given sampling period. Read More

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The patellofemoral morphology and the normal predicted value of tibial tuberosity-trochlear groove distance in the Chinese population.

BMC Musculoskelet Disord 2021 Jun 23;22(1):575. Epub 2021 Jun 23.

Department of Bone and Joint Surgery, The Second Affiliated Hospital of Medical College, Xi'an Jiaotong University, Shaanxi, 710004, Xi'an, People's Republic of China.

Background: Our objective was to obtain normal patellofemoral measurements to analyse sex and individual differences. In addition, the absolute values and indices of tibial tuberosity-trochlear groove (TT-TG) distances are still controversial in clinical application. A better method to enable precise prediction is still needed. Read More

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Inter and intra-observer errors for postoperative total hip radiographic assessment using computer aided design.

Acta Orthop Belg 2021 Mar;87(1):65-71

Plain radiographic assessment of primary total hip arthroplasty following surgery remains to be the commonest radiological assessment. The current paper, studies the accuracy and concordance between observers reviewing these radiographs. A prospective radiographic and medical note review of ten patients who underwent total hip replacement for primary osteoarthritis, with a mean age of 69 years. Read More

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Comparison of Patellofemoral-Specific Clinical and Radiographic Results after Total Knee Arthroplasty Using a Patellofemoral Design-Modified Prosthesis and Its Predecessor.

Clin Orthop Surg 2021 Jun 2;13(2):175-184. Epub 2021 Feb 2.

Department of Orthopaedic Surgery, Kyung Hee University College of Medicine, Seoul, Korea.

Backgroud: One recently developed total knee arthroplasty (TKA) prosthesis was designed to alter the patellofemoral geometry and optimize patellar tracking compared to its predecessor. Despite an expectation that the improved design would contribute to optimal patellofemoral compatibility, its effect has not been confirmed with patellofemoral-specific clinical scoring systems and radiographic parameters. Our purpose was to compare patellofemoral-specific clinical and radiographic results after TKA using a patellofemoral design-modified prosthesis and its predecessor. Read More

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Surgical procedures for the prevention of extension-flexion gap imbalance in total knee arthroplasty.

J Orthop 2021 May-Jun;25:224-229. Epub 2021 May 14.

Department of Orthopaedic Surgery, Gifu University Graduate School of Medicine. 1-1Yanagido, Gifu City, Gifu, 501-1194, Japan.

The purpose of this study was to identify preoperative and intraoperative factors that influence extension-flexion gap imbalance in total knee arthroplasty (TKA). Ninety-three knees undergoing TKA with the modified gap balancing technique were included. Preoperative range of motion, intraoperative extension-flexion gap balance, thickness of the resected bone and radiological parameters were investigated. Read More

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Measurement of femoral posterior condylar offset and posterior tibial slope in normal knees based on 3D reconstruction.

BMC Musculoskelet Disord 2021 May 27;22(1):486. Epub 2021 May 27.

Division of orthopaedic surgery, Department of orthopaedics, Nanfang Hospital, Southern Medical University, 1838 Guangzhou Avenue, Guangzhou, 510515, Guangdong, China.

Background: Femoral posterior condylar offset (PCO) and posterior tibial slope (PTS) are important for postoperative range of motion after total knee arthroplasty (TKA). However, normative data of PCO and PTS and the correlation between them among healthy populations remain to be elucidated. The purpose of this study was to determine PCO and PTS in normal knees, and to identify the correlation between them. Read More

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Risk factors of de novo hyperextension developed after posterior cruciate ligament substituting total knee arthroplasty: a matched case-control study.

Knee Surg Sports Traumatol Arthrosc 2021 May 24. Epub 2021 May 24.

Department of Orthopaedic Surgery, Seoul National University Hospital, 101 Daehak-Ro Jongno-Gu, Seoul, 03080, Republic of Korea.

Purpose: To investigate factors contributing to the de novo hyperextension after posterior cruciate ligament substituting (PS) total knee arthroplasty (TKA).

Methods: Through a retrospective case-control study, de novo hyperextension patients were compared with patients without hyperextension after primary PS TKA. Eighty-five hyperextension patients were compared with 85 patients in a control group matched by age, sex, surgeon and implant. Read More

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Arthroscopic Management of Scapulothoracic Bursitis: Clinical Outcomes and Assessment of Novel Bony Parameters on Magnetic Resonance Imaging.

Orthop J Sports Med 2021 Apr 26;9(4):2325967121998273. Epub 2021 Apr 26.

Department of Orthopaedic Surgery, Singapore General Hospital, Singapore.

Background: Scapulothoracic bursitis is a significant clinical condition that limits day-to-day function. Arthroscopic scapular debridement and resection have provided satisfactory outcomes; however, techniques, approaches, and recommendations remain varied. Novel bony parameters have also gained increasing interest owing to their value in preoperative planning. Read More

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Iliac Screw Fixation Revisited: Improved Clinical and Radiologic Outcomes Using a Modified Iliac Screw Fixation Technique.

Clin Spine Surg 2021 Apr 23. Epub 2021 Apr 23.

Swedish Neuroscience Institute, Swedish Medical Center Seattle Science Foundation, Seattle, WA Department of Trauma Surgery, BG University Hospital Bergmannsheil, Ruhr University Bochum, Bochum, Germany Hansjörg Wyss Hip and Pelvic Center, Swedish Hospital, Seattle, WA Riverside University Health System Medical Center, Moreno Valley, CA Department of Neurosurgery, Heidelberg University Hospital, Heidelberg, Germany Spectrum Research Inc, Tacoma, WA.

Study Design: A retrospective study.

Objective: To describe the modified iliac screw (mILS) technique and compare it to other spinopelvic fixation techniques in terms of wound healing complications, hardware prominence, and failure.

Summary Of Background Data: The traditional entry point of an iliac screw often causes postoperative gluteal pain from the prominent screw head. Read More

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Fully Implantable Plantar Cutaneous Augmentation System for Rats Using Closed-loop Electrical Nerve Stimulation.

IEEE Trans Biomed Circuits Syst 2021 04 25;15(2):326-338. Epub 2021 May 25.

Plantar cutaneous feedback plays an important role in stable and efficient gait, by modulating the activity of ankle dorsi- and plantar-flexor muscles. However, central and peripheral nervous system trauma often decrease plantar cutaneous feedback and/or interneuronal excitability in processing the plantar cutaneous feedback. In this study, we tested a fully implantable neural recording and stimulation system augmenting plantar cutaneous feedback. Read More

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Improved sizing with image-based robotic-assisted system compared to image-free and conventional techniques in medial unicompartmental knee arthroplasty.

Bone Joint J 2021 Apr;103-B(4):610-618

Orthopaedics Surgery and Sports Medicine Department, Croix-Rousse Hospital, Lyon University Hospital, Lyon, France.

Aims: Ideal component sizing may be difficult to achieve in unicompartmental knee arthroplasty (UKA). Anatomical variants, incremental implant size, and a reduced surgical exposure may lead to over- or under-sizing of the components. The purpose of this study was to compare the accuracy of UKA sizing with robotic-assisted techniques versus a conventional surgical technique. Read More

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Measured Resection Techniques Do Not Align to the Cylindrical Axis in Kinematic Total Knee Arthroplasty.

Arthroplast Today 2021 Apr 23;8:157-162. Epub 2021 Mar 23.

Orthopaedic Department, Westmead Hospital, Westmead, New South Wales, Australia.

Background: There has been increasing interest with improved functional results in kinematically aligned total knee arthroplasty. Kinematic alignment seeks to replicate the rotational axes of the individual knee. The femoral component can either be aligned to the estimated prearthritic distal and posterior joint lines via a measured-resection technique or by aligning to the cylindrical axis (CA). Read More

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Evaluation of Cam Deformity on 3-Dimensional Computed Tomography With the Best-Fit Sphere Technique and the Alpha Angle Marking Method.

Am J Sports Med 2021 03 16;49(4):1023-1030. Epub 2021 Feb 16.

Department of Sports Medicine, Huashan Hospital, Fudan University, Shanghai, China.

Background: Three-dimensional computed tomography (3D-CT) is commonly used for the evaluation of cam deformity; however, it does not display the cam border directly.

Purpose: To compare the efficacy of the best-fit sphere (BFS) method and the alpha angle marking (AAM) method in 3D-CT evaluation for the cam border.

Study Design: Cohort study (Diagnosis); Level of evidence, 3. Read More

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Postural sway in young female artistic and acrobatic gymnasts according to training experience and anthropometric characteristics.

BMC Sports Sci Med Rehabil 2021 Feb 12;13(1):11. Epub 2021 Feb 12.

Institute of Sport Sciences, Department of Human Motor Behavior, The Jerzy Kukuczka Academy of Physical Education, 40-065, Katowice, Poland.

Background: Gymnastics training enhances the development of postural control in children and adolescents. In competitive gymnastics, the training regimen is specific to the given gymnastic discipline and is usually followed from the early years of practicing. This study aimed to determine whether postural steadiness differed between young gymnasts practicing two distinct disciplines, and whether it was related to the duration of their training experience, age, and their anthropometric characteristics. Read More

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February 2021

The medial gap is a reliable indicator for intraoperative soft tissue balancing in posterior-stabilized total knee arthroplasty.

Knee 2021 Mar 9;29:68-77. Epub 2021 Feb 9.

Hokkaido Orthopaedic Memorial Hospital, Hiragishi, Toyohira-ku, Sapporo, Japan.

Background: Appropriate soft tissue balance and accurate alignment are important for successful total knee arthroplasty (TKA). However, the optimal technique for establishing and measuring soft tissue balancing remains unclear. The aim of this study was to analyze the intraoperative medial and lateral gap pattern using digital knee balancer in posterior-stabilized (PS) TKA. Read More

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Editorial Commentary: The Pivot Shift and Lachman Examinations: Teammates With Distinct Roles.

Arthroscopy 2021 02;37(2):682-685

New York, New York.

The pivot shift and Lachman examinations are "teammates" with complementary but distinct roles in the successful diagnosis and treatment of anterior cruciate ligament rupture and injury to the surrounding soft-tissue envelope of the knee. The Lachman test measures anterior tibial translation in response to an applied anterior tibial load. This test assesses the integrity of the native or reconstructed anterior cruciate ligament and the secondary medial restraints including the medial meniscus and medial collateral ligament. Read More

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February 2021

The role of delta and theta oscillations during ego-motion in healthy adult volunteers.

Exp Brain Res 2021 Apr 3;239(4):1073-1083. Epub 2021 Feb 3.

Department of Neurology, Ludwig-Maximilians-Universität München, München, Germany.

The successful cortical processing of multisensory input typically requires the integration of data represented in different reference systems to perform many fundamental tasks, such as bipedal locomotion. Animal studies have provided insights into the integration processes performed by the neocortex and have identified region specific tuning curves for different reference frames during ego-motion. Yet, there remains almost no data on this topic in humans. Read More

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Rapid Aging in the Perforant Path Projections to the Rodent Dentate Gyrus.

J Neurosci 2021 03 29;41(10):2301-2312. Epub 2021 Jan 29.

Departments of Anatomy & Neurobiology

Why layers II/III of entorhinal cortex (EC) deteriorate in advance of other regions during the earliest stages of Alzheimer's disease is poorly understood. Failure of retrograde trophic support from synapses to cell bodies is a common cause of neuronal atrophy, and we accordingly tested for early-life deterioration in projections of rodent layer II EC neurons. Using electrophysiology and quantitative imaging, changes in EC terminals during young adulthood were evaluated in male rats and mice. Read More

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Posterior condylar offset and posterior tibial slope targets to optimize knee flexion after unicompartmental knee arthroplasty.

Knee Surg Sports Traumatol Arthrosc 2021 Jan 29. Epub 2021 Jan 29.

Department of Orthopaedic Surgery, Singapore General Hospital, 20 College Road, Academia, Level 4, Singapore, 169856, Singapore.

Purpose: To evaluate the relationship between posterior tibial slope (PTS), posterior condylar offset (PCO), femoral sagittal angle (FSA) on clinical outcomes, and propose optimal sagittal plane alignments for unicompartmental knee arthroplasty (UKA).

Methods: Prospectively collected data of 265 medial UKA was analysed. PTS, PCO, FSA were measured on preoperative and postoperative lateral radiographs. Read More

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January 2021

Morphological changes affecting ipsilateral and contralateral leg alignment after total hip arthroplasty.

J Orthop 2021 Jan-Feb;23:73-77. Epub 2020 Dec 29.

Department of Orthopaedic Surgery, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.

Background: It is still unclear whether morphological changes in hip disorders is a pathogenic or independent factor for the variations in leg alignment. The purpose of this study was to elucidate the characteristics of the change in leg alignment after total hip arthroplasty (THA) and the morphological factors affecting the ipsilateral and contralateral leg alignment.

Methods: Both pre-operative and post-operative bilateral whole-leg radiographs in the standing position were taken in 100 patients who underwent THA. Read More

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December 2020