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https://www.readbyqxmd.com/read/29449003/upper-partial-fibulectomy-improves-knee-biomechanics-and-function-and-decreases-knee-pain-of-osteoarthritis-a-pilot-and-biomechanical-study
#1
Yong Nie, Jun Ma, ZeYu Huang, Bin Xu, Shuo Tang, Bin Shen, Virginia Byers Kraus, FuXing Pei
To investigate the change in clinical outcomes and biomechanical properties of the knee in response to upper partial fibulectomy. Sixteen patients with medial compartment knee osteoarthritis (KOA) underwent upper partial fibulectomy. Visual analog scale (VAS) pain, the hospital for special surgery knee score (HSS), hip-knee-ankle (HKA) angle (measured in the frontal plane), and flexion/extension range of motion of the knee were assessed before and up to 6 months after surgery. Patients were evaluated for gait parameters and overall peak knee adduction moment (KAM)...
December 13, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29401510/physiological-joint-line-total-knee-arthroplasty-designs-are-especially-sensitive-to-rotational-placement-a-finite-element-analysis
#2
Philippe Moewis, Sara Checa, Ines Kutzner, Hagen Hommel, Georg N Duda
Mechanical and kinematical aligning techniques are the usual positioning methods during total knee arthroplasty. However, alteration of the physiological joint line and unbalanced medio-lateral load distribution are considered disadvantages in the mechanical and kinematical techniques, respectively. The aim of this study was to analyse the influence of the joint line on the strain and stress distributions in an implanted knee and their sensitivity to rotational mal-alignment. Finite element calculations were conducted to analyse the stresses in the PE-Inlay and the mechanical strains at the bone side of the tibia component-tibia bone interface during normal positioning of the components and internal and external mal-rotation of the tibial component...
2018: PloS One
https://www.readbyqxmd.com/read/29395747/a-preliminary-modeling-investigation-into-the-safe-correction-zone-for-high-tibial-osteotomy
#3
Jennifer Lb Martay, Antony Jr Palmer, Neil K Bangerter, Stuart Clare, A Paul Monk, Cameron P Brown, Andrew J Price
BACKGROUND: High tibial osteotomy (HTO) re-aligns the weight-bearing axis (WBA) of the lower limb. The surgery reduces medial load (reducing pain and slowing progression of cartilage damage) while avoiding overloading the lateral compartment. The optimal correction has not been established. This study investigated how different WBA re-alignments affected load distribution in the knee, to consider the optimal post-surgery re-alignment. METHODS: We collected motion analysis and seven Tesla MRI data from three healthy subjects, and combined this data to create sets of subject-specific finite element models (total=45 models)...
January 21, 2018: Knee
https://www.readbyqxmd.com/read/29365222/heel-pain-diagnosis-and-management
#4
Priscilla Tu
The differential diagnosis of heel pain is extensive, but a mechanical etiology is the most common. The specific anatomic location of the pain can help guide diagnosis. The most common diagnosis is plantar fasciitis, which leads to medial plantar heel pain, especially with the first weight-bearing steps after rest. Other causes of plantar heel pain include calcaneal stress fractures (progressively worsening pain after an increase in activity or change to a harder walking surface), nerve entrapment or neuroma (pain accompanied by burning, tingling, or numbness), heel pad syndrome (deep, bruise-like pain in the middle of the heel), and plantar warts...
January 15, 2018: American Family Physician
https://www.readbyqxmd.com/read/29338748/finite-element-analysis-of-intramedullary-nailing-and-double-locking-plate-for-treating-extra-articular-proximal-tibial-fractures
#5
Fancheng Chen, Xiaowei Huang, Yingsun Ya, Fenfen Ma, Zhi Qian, Jifei Shi, Shuolei Guo, Baoqing Yu
BACKGROUND: Proximal tibia fractures are one of the most familiar fractures. Surgical approaches are usually needed for anatomical reduction. However, no single treatment method has been widely established as the standard care. Our present study aims to compare the stress and stability of intramedullary nails (IMN) fixation and double locking plate (DLP) fixation in the treatment of extra-articular proximal tibial fractures. METHODS: A three-dimensional (3D) finite element model of the extra-articular proximal tibial fracture, whose 2-cm bone gap began 7 cm from the tibial plateau articular surface, was created fixed by different fixation implants...
January 16, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29309446/patella-alta-a-comprehensive-review-of-current-knowledge
#6
Roland M Biedert, Philippe M Tscholl
We systematically reviewed patella alta with respect to type of measurements, reported cutoff values, cutoff values for surgical correction, and proposed surgical techniques. Using the term patella alta, we performed a systematic literature search on PubMed. Inclusion criteria were original study or review articles, publication in peer-reviewed English-language journals between 2000 and 2017, and narrative description or measurement of human patellar height on plain radiographs or magnetic resonance imaging (MRI)...
November 2017: American Journal of Orthopedics
https://www.readbyqxmd.com/read/29238405/the-effect-of-a-running-task-on-muscle-shear-elastic-modulus-of-posterior-lower-leg
#7
Shuhei Ohya, Masatoshi Nakamura, Takafumi Aoki, Daichi Suzuki, Takanori Kikumoto, Emi Nakamura, Wataru Ito, Ryo Hirabayashi, Tomoya Takabayashi, Mutsuaki Edama
Background: Medial tibial stress syndrome (MTSS) is one of the most common causes of exercise-related leg pain in runners. Because stopping training due to pain from MTSS could decrease the athlete's competitiveness, it is necessary to construct MTSS prevention and treatment programs. However, the effect of running, which is believed to cause MTSS, on shear elastic modulus of the posterior lower leg is unclear. Therefore, the purpose of this study was to investigate the effect of 30 min of running on shear elastic modulus of the posterior lower leg in healthy subjects...
2017: Journal of Foot and Ankle Research
https://www.readbyqxmd.com/read/29234021/workflow-assessing-the-effect-of-gait-alterations-on-stresses-in-the-medial-tibial-cartilage-combined-musculoskeletal-modelling-and-finite-element-analysis
#8
K S Halonen, C M Dzialo, M Mannisi, M S Venäläinen, M de Zee, M S Andersen
Knee osteoarthritis (KOA) is most common in the medial tibial compartment. We present a novel method to study the effect of gait modifications and lateral wedge insoles (LWIs) on the stresses in the medial tibial cartilage by combining musculoskeletal (MS) modelling with finite element (FE) analysis. Subject's gait was recorded in a gait laboratory, walking normally, with 5° and 10° LWIs, toes inward ('Toe in'), and toes outward ('Toe out wide'). A full lower extremity MRI and a detailed knee MRI were taken...
December 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29232748/-combined-posteromedial-and-anterolateral-approach-in-the-floating-position-two-column-fracture-of-the-tibia-head
#9
Maike Reul, Harm Hoekstra
Background The posterior tibial plateau is often affected in intra-articular tibial fractures. Moreover, treating these posterior fractures is recognised as an important prognostic factor. Open reduction and internal fixation of lateral and posterior two column tibial plateau fractures can be achieved via a combined reversed L-shape approach and an anterolateral approach in the floating position without intraoperative repositioning of the patient. Material and Methods The operative procedure starts in the posterior position with visualisation of the posterior column after lateral retraction of the medial head of the M...
December 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/29209793/degenerative-changes-after-posterior-cruciate-ligament-reconstruction-are-irrespective-of-posterior-knee-stability-mri-based-long-term-results
#10
Clemens Gwinner, Andreas Weiler, Timm Denecke, Julian M M Rogasch, Heide Boeth, Tobias M Jung
INTRODUCTION: Posterior cruciate ligament reconstruction (PCLR) is advocated to prevent an early onset of osteoarthritis. We hypothesized that posterior instability after PCLR correlates with degenerative changes. MATERIALS AND METHODS: MRIs of 42 (12 female/30 male; 39 ± 9 years) patients were enrolled with a minimum 5-year follow-up (FFU) after PCLR. In addition, 25 contralateral and 15 follow-up MRIs (12 months after baseline) were performed. Degenerative changes were graded using WORMS...
December 6, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29162607/computational-study-on-the-effect-of-malalignment-of-the-tibial-component-on-the-biomechanics-of-total-knee-arthroplasty-a-finite-element-analysis
#11
D-S Suh, K-T Kang, J Son, O-R Kwon, C Baek, Y-G Koh
OBJECTIVES: Malalignment of the tibial component could influence the long-term survival of a total knee arthroplasty (TKA). The object of this study was to investigate the biomechanical effect of varus and valgus malalignment on the tibial component under stance-phase gait cycle loading conditions. METHODS: Validated finite element models for varus and valgus malalignment by 3° and 5° were developed to evaluate the effect of malalignment on the tibial component in TKA...
November 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/29145309/short-term-effects-of-sports-taping-on-navicular-height-navicular-drop-and-peak-plantar-pressure-in-healthy-elite-athletes-a-within-subject-comparison
#12
RANDOMIZED CONTROLLED TRIAL
Taegyu Kim, Jong-Chul Park
Medial tibial stress syndrome (MTSS) is one of the most common exercise-induced leg pain. The navicular drop (ND) was identified as a risk factor for MTSS. This study aimed to evaluate the short-term effects of sports taping applied to the supporting lower leg during sitting, standing, walking, and jogging to restrict the ND in healthy elite athletes.Twenty-four healthy elite athletes without a history of exercise-induced pain or injuries in the lower limbs participated in this study (median age: 21.00 years; 1st--3rd quartiles; 19...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29124289/peak-stresses-shift-from-femoral-tunnel-aperture-to-tibial-tunnel-aperture-in-lateral-tibial-tunnel-acl-reconstructions-a-3d-graft-bending-angle-measurement-and-finite-element-analysis
#13
Hans Van Der Bracht, Thomas Tampere, Pieter Beekman, Alexander Schepens, Wouter Devriendt, Peter Verdonk, Jan Victor
PURPOSE: To investigate the effect of tibial tunnel orientation on graft-bending angle and stress distribution in the ACL graft. METHODS: Eight cadaveric knees were scanned in extension, 45°, 90°, and full flexion. 3D reconstructions with anatomically placed anterior cruciate ligament (ACL) grafts were constructed with Mimics 14.12(®). 3D graft-bending angles were measured for classic medial tibial tunnels (MTT) and lateral tibial tunnels (LTT) with different drill-guide angles (DGA) (45°, 55°, 65°, and 75°)...
November 9, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29122474/predicting-individual-risk-for-medial-tibial-stress-syndrome-in-navy-recruits
#14
Cameron Garnock, Jeremy Witchalls, Phil Newman
OBJECTIVES: Quantifying individual risk for medial tibial stress syndrome (MTSS) is valuable due to the high prevalence, substantial financial and service costs, and lengthy recovery time of the condition. Identification of those at risk is a key first step in prevention of the condition. This study aimed to test a suite of best evidence risk factors in a cohort of Navy recruits and to develop a predictive model for individuals at risk of MTSS. DESIGN: Prospective cohort study of Navy recruits undergoing initial training METHODS: A prospective cohort design, this study screened recruits by assessing gender, MTSS history, years of running experience, orthotic use, BMI, navicular drop, ankle plantarflexion and hip external rotation at the beginning of basic training...
October 23, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29080511/influence-of-outdoor-running-fatigue-and-medial-tibial-stress-syndrome-on-accelerometer-based-loading-and-stability
#15
Kurt H Schütte, Stefan Seerden, Rachel Venter, Benedicte Vanwanseele
Medial tibial stress syndrome (MTSS) is a common overuse running injury with pathomechanics likely to be exaggerated by fatigue. Wearable accelerometry provides a novel alternative to assess biomechanical parameters continuously while running in more ecologically valid settings. The purpose of this study was to determine the influence of outdoor running fatigue and MTSS on both dynamic loading and dynamic stability derived from trunk and tibial accelerometery. Runners with (n=14) and without (n=16) history of MTSS performed an outdoor fatigue run of 3200m...
January 2018: Gait & Posture
https://www.readbyqxmd.com/read/29067955/effects-of-lower-limb-alignment-and-tibial-component-inclination-on-the-biomechanics-of-lateral-compartment-in-unicompartmental-knee-arthroplasty
#16
Peng-Fei Wen, Wan-Shou Guo, Fu-Qiang Gao, Qi-Dong Zhang, Ju-An Yue, Li-Ming Cheng, Guang-Duo Zhu
BACKGROUND: Lateral compartmental osteoarthritis (LCOA), a major complication after medial mobile-bearing unicompartmental knee arthroplasty (UKA), is highly associated with the increased stress of the lateral compartment. This study aimed to analyze the effects on the stress and load distribution of the lateral compartment induced by lower limb alignment and coronal inclination of the tibial component in UKA through a finite element analysis. METHODS: Eight three-dimensional models were constructed based on a validated model for analyzing the biomechanical effects of implantation parameters on the lateral compartment after medial Oxford UKA: postoperative lower limb alignment of 3° valgus, neutral and 3° varus, and the inclination of tibial components placed in 4°, 2° valgus, square, and 2° and 4° varus...
November 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/29056595/effectiveness-of-foot-orthoses-for-the-prevention-of-lower-limb-overuse-injuries-in-naval-recruits-a-randomised-controlled-trial
#17
Daniel R Bonanno, George S Murley, Shannon E Munteanu, Karl B Landorf, Hylton B Menz
OBJECTIVES: To evaluate the effectiveness of prefabricated foot orthoses for the prevention of lower limb overuse injuries in naval recruits. METHODS: This study was a participant-blinded and assessor-blinded, parallel-group randomised controlled trial. Three-hundred and six participants aged 17-50 years who undertook 11 weeks of initial defence training at the Royal Australian Navy Recruit School (Cerberus, Australia) were randomised to a control group (flat insoles, n=153) or an intervention group (contoured, prefabricated foot orthoses, n=153)...
October 22, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/29033262/primary-stability-of-different-plate-positions-and-the-role-of-bone-substitute-in-open-wedge-high-tibial-osteotomy
#18
Ryohei Takeuchi, Jung Woon-Hwa, Hiroyuki Ishikawa, Yuichiro Yamaguchi, Katsunari Osawa, Yasushi Akamatsu, Koichi Kuroda
BACKGROUND: The purpose of this study was to compare the mechanical fixation strengths of anteromedial and medial plate positions in osteotomy, and clarify the effects of bone substitute placement into the osteotomy site. METHODS: Twenty-eight sawbone tibia models were used. Four different models were prepared: Group A, the osteotomy site was open and the plate position was anteromedial; Group B, bone substitutes were inserted into the osteotomy site and the plate position was anteromedial; Group C, the osteotomy site was open and the plate position was medial; and Group D, bone substitutes were inserted into the osteotomy site and the plate position was medial...
October 12, 2017: Knee
https://www.readbyqxmd.com/read/29028358/posterior-tibial-translation-measurements-on-magnetic-resonance-imaging-improve-diagnostic-sensitivity-for-chronic-posterior-cruciate-ligament-injuries-and-graft-tears
#19
Nicholas N DePhillipo, Mark E Cinque, Jonathan A Godin, Gilbert Moatshe, Jorge Chahla, Robert F LaPrade
BACKGROUND: Magnetic resonance imaging (MRI) of the knee is a highly sensitive and specific method for diagnosing acute posterior cruciate ligament (PCL) tears, with a reported accuracy of 96% to 100%. In chronic and revision settings, these injuries may be missed on MRI because of the apparent continuity of nonfunctional PCL fibers. Posterior tibial translation (PTT) of the medial compartment has been identified as a potential secondary finding of PCL tear on routine MRI. Purpose/Hypothesis: The purpose of this study was to evaluate the sensitivity of PTT on MRI associated with PCL injuries and compare it with the sensitivity of a radiologist's MRI interpretation with preoperative posterior knee stress radiographs as the gold standard...
October 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29017801/influence-of-increased-posterior-tibial-slope-in-total-knee-arthroplasty-on-knee-joint-biomechanics-a-computational-simulation-study
#20
Kyoung-Tak Kang, Yong-Gon Koh, Juhyun Son, Oh-Ryong Kwon, Jun-Sang Lee, Sae-Kwang Kwon
BACKGROUND: The reconstructed posterior tibial slope (PTS) plays a significant role in restoring knee kinematics in cruciate-retaining-total knee arthroplasty (TKA). A few studies have reported the effect of the PTS on biomechanics. METHODS: This study investigates the effect of the PTS on tibiofemoral (TF) kinematics, patellofemoral (PF) contact stress, and forces at the quadriceps, posterior cruciate ligament (PCL) and collateral ligament after cruciate-retaining-TKA using computer simulations...
September 21, 2017: Journal of Arthroplasty
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