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https://www.readbyqxmd.com/read/28501956/an-in-vitro-evaluation-of-sagittal-alignment-in-the-cervical-spine-after-insertion-of-supraphysiologic-lordotic-implants
#1
Donald J Blaskiewicz, Jeffrey E Harris, Patrick P Han, Alexander W Turner, Gregory M Mundis
PURPOSE: Cervical spine malalignment can develop as a consequence of degenerative disc disease or following spinal surgery. When normal sagittal alignment of the spine is disrupted, further degeneration may occur adjacent to the deformity. The purpose of this study was to investigate changes in lordosis and sagittal alignment in the cervical spine after insertion of supraphysiologic lordotic implants. METHODS: Eight cadaveric cervical spines (Occiput-T1) were tested...
May 13, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28438418/radiological-evaluation-of-ankle-arthrodesis-with-ilizarov-fixation-compared-to-internal-fixation
#2
Piotr Morasiewicz, Maciej Dejnek, Wiktor Urbański, Szymon Łukasz Dragan, Mirosław Kulej, Szymon Feliks Dragan
INTRODUCTION: We asked whether the type of ankle joint arthrodesis stabilization will affect: (1) rate of union, (2) rate of adjacted-joint arthritis, (3) malalignment of the ankle joint. MATERIAL AND METHODS: We retrospectively radiological studied 62 patients who underwent ankle arthrodesis with Ilizarov external fixator stabilization (group 1,n=29) or internal stabilization (group 2,n=33) from 2006 to 2015. Radiologic outcomes were mesure by: (1) rate of union, (2) rate of adjacent-joint arthritis, (3) malalignment of the ankle joint...
April 13, 2017: Injury
https://www.readbyqxmd.com/read/28431578/is-the-effectiveness-of-patellofemoral-bracing-modified-by-patellofemoral-alignment-and-trochlear-morphology
#3
Xi Zhang, Jillian P Eyles, Joanna Makovey, Matthew J Williams, David J Hunter
BACKGROUND: This study was performed to determine if the effectiveness of patellofemoral bracing as a treatment for patellofemoral osteoarthritis is influenced by patellofemoral joint alignment and trochlear morphology. We hypothesized that those with more extreme patellar malalignment would benefit more from bracing. METHODS: Thirty-eight patients who had received bracing as part of a comprehensive treatment plan for patellofemoral osteoarthritis were selected for this study...
April 21, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28419292/design-and-testing-of-2-novel-scores-that-predict-global-sagittal-alignment-utilizing-cervical-or-lumbar-plain-radiographs
#4
Ezequiel Goldschmidt, Federico Angriman, Bruno Ferreyro, Nitin Agarwal, James Zhou, Katherine Chen, Zachary J Tempel, Peter C Gerszten, Adam S Kanter, David O Okonkwo, Peter Passias, Justin Scheer, Themistocles Protopsaltis, Virginie Lafage, Renaud Lafage, Frank Schwab, Shay Bess, Chris Ames, Justin S Smith, Douglas Burton, D Kojo Hamilton
BACKGROUND: Global sagittal deformity is an established cause of disability. However, measurements of sagittal alignment are often ignored when patients present with symptoms localizing to the cervical or lumbar spine. OBJECTIVE: To develop scoring scales to predict the risk of sagittal malalignment in patients with only cervical or lumbar spine radiographs. METHODS: A retrospective review of a prospectively maintained multicenter adult spinal deformity database was performed...
April 17, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28361192/-malalignment-of-the-first-ray-clinical-and-radiological-diagnostics
#5
M Walther
Clinical and radiological examination of the foot are mandatory before surgical correction of the forefoot. The clinical examination includes leg axis, position of the hind foot, deformity of the first ray as well as skin conditions, pulse status and possible sensitive deficits. A shortening of the gastrocnemius muscle can be identified using the Silfverskiöld test. Discomfort in the midfoot can indicate pathologies of the tarsometatarsal joint and the same applies for osteophyte infiltration around the Lisfranc joint line, whereby the second tarsometatarsal joint often shows more advanced degenerative arthritis than the first tarsometatarsal joint...
May 2017: Der Orthopäde
https://www.readbyqxmd.com/read/28291955/change-of-chondral-lesions-and-predictive-factors-after-medial-open-wedge-high-tibial-osteotomy-with-a-locked-plate-system
#6
Kang-Il Kim, Min-Chul Seo, Sang-Jun Song, Dae-Kyung Bae, Duk-Hyun Kim, Sang Hak Lee
BACKGROUND: Although cartilage regeneration after medial open-wedge high tibial osteotomy (HTO) has been described, there is a paucity of reports regarding which factors influence cartilage regeneration. PURPOSE: To document whether cartilage regeneration occurs in the previously degenerated medial compartment of arthritic knees after medial open-wedge HTO without concomitant cartilage procedures and to assess which predictive factors influence regeneration after HTO...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28264631/effects-of-patellofemoral-taping-on-patellofemoral-joint-alignment-and-contact-area-during-weight-bearing
#7
Kai-Yu Ho, Ryan Epstein, Ron Garcia, Nicole Riley, Szu-Ping Lee
Study Design Controlled laboratory study. Background Although it has been theorized that patellofemoral joint (PFJ) taping can correct patellar malalignment, the effects of PFJ taping techniques on patellar alignment and contact area have not yet been studied during weight bearing. Objective To examine the effects of 2 taping approaches (Kinesio and McConnell) on PFJ alignment and contact area. Methods Fourteen female subjects with patellofemoral pain and PFJ malalignment participated. Each subject underwent a pretaping magnetic resonance imaging (MRI) scan session and 2 MRI scan sessions after the application of the 2 taping techniques, which aimed to correct lateral patellar displacement...
February 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/28244909/predictors-of-reoperation-for-adult-femoral-shaft-fractures-managed-operatively-in-a-sub-saharan-country
#8
Edmund N Eliezer, Billy T Haonga, Saam Morshed, David W Shearer
BACKGROUND: The optimal treatment for femoral shaft fractures in low-resource settings has yet to be established, in part, because of a lack of data supporting operative treatment modalities. We aimed to determine the reoperation rate among femoral fractures managed operatively and to identify risk factors for reoperation at a hospital in a Sub-Saharan country. METHODS: We conducted a prospective clinical study at a single tertiary care center in Tanzania, enrolling all skeletally mature patients with diaphyseal femoral fractures managed operatively from July 2012 to July 2013...
March 1, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28169136/in-vitro-wear-of-ultrahigh-molecular-weight-polyethylene-and-vitamin-e-blended-highly-cross-linked-polyethylene-in-linked-semiconstrained-total-elbow-replacement-prostheses
#9
Oludele O Popoola, Brian L Kincaid, Kimberly Mimnaugh, Mark Marqueling
BACKGROUND: The objectives of this study were to develop a clinically relevant in vitro elbow wear test and to compare the polyethylene wear of 2 total elbow replacement prostheses, one that uses conventional gamma-irradiated polyethylene (CPE) and one that uses vitamin E blended and cross-linked polyethylene (VE-HXPE) bushings. MATERIALS AND METHODS: The test protocol applied 0° to 85° flexion-extension motions and imposed a constant 4.5° varus malalignment of the ulnar relative to the humeral implant under a variable joint load profile at a frequency of 1 Hz...
February 3, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28155677/finite-element-analysis-of-the-valgus-knee-joint-of-an-obese-child
#10
Jun Sun, Songhua Yan, Yan Jiang, Duo Wai-Chi Wong, Ming Zhang, Jizhou Zeng, Kuan Zhang
BACKGROUND: Knee valgus and varus morbidity is at the second top place in children lower limb deformity diseases. It may cause abnormal stress distribution. The magnitude and location of contact forces on tibia plateau during gait cycle have been indicated as markers for risk of osteoarthritis. So far, few studies reported the contact stress and force distribution on tibial plateau of valgus knee of children. METHODS: To estimate the contact stresses and forces on tibial plateau of an 8-year old obese boy with valgus knee and a 7-year old healthy boy, three-dimensional (3D) finite element (FE) models of their left knee joints were developed...
December 28, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28125900/geometry-of-the-valgus-knee-contradicting-the-dogma-of-a-femoral-based-deformity
#11
Helge Eberbach, Julian Mehl, Matthias J Feucht, Gerrit Bode, Norbert P Südkamp, Philipp Niemeyer
BACKGROUND: Realignment osteotomies of valgus knee deformities are usually performed at the distal femur, as valgus alignment is considered to be a femoral-based deformity. This dogma, however, has not been proven in a large patient population. Valgus malalignment may also be caused by a tibial deformity or a combined tibial and femoral deformity. PURPOSE: The purposes of this study were (1) to analyze the coronal geometry of patients with valgus malalignment and identify the location of the underlying deformity and (2) to investigate the proportion of cases that require realignment osteotomy at the tibia, the femur, or both locations to avoid an oblique joint line...
March 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28099301/unicompartmental-knee-arthroplasty-provides-higher-activity-and-durability-than-valgus-producing-proximal-tibial-osteotomy-at-5-to-7-years
#12
COMPARATIVE STUDY
Aaron J Krych, Patrick Reardon, Paul Sousa, Ayoosh Pareek, Michael Stuart, Mark Pagnano
BACKGROUND: The cases of patients with medial compartment osteoarthritis who were ≤55 years old and had a proximal tibial osteotomy (PTO) or medial unicompartmental knee arthroplasty (UKA) were compared. Outcomes included postoperative activity level, function, and survivorship free of revision to total knee arthroplasty. METHODS: Between 1998 and 2013, data were available for 240 patients between 18 and 55 years old with medial compartment arthritis and varus malalignment who were treated either with PTO (57 patients) or with UKA (183 patients)...
January 18, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28072630/bracing-of-the-reconstructed-and-osteoarthritic-knee-during-high-dynamic-load-tasks
#13
Harvi F Hart, Kay M Crossley, Natalie J Collins, David C Ackland
PURPOSE: Lateral compartment osteoarthritis accompanied by abnormal knee biomechanics are frequently reported in individuals with knee osteoarthritis after anterior cruciate ligament reconstruction (ACLR). The aim of this study was to evaluate changes in knee biomechanics produced by an adjusted and unadjusted varus knee brace during high dynamic loading activities in individuals with lateral knee osteoarthritis after ACLR and valgus malalignment. METHODS: Nineteen participants who had undergone ACLR 5 to 20 years previously and had symptomatic and radiographic lateral knee osteoarthritis with valgus malalignment were assessed...
January 9, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28053258/ankle-joint-pressure-changes-in-high-tibial-and-distal-femoral-osteotomies-a-cadaver-study
#14
F Krause, A Barandun, G Klammer, I Zderic, B Gueorguiev, T Schmid
AIMS: To assess the effect of high tibial and distal femoral osteotomies (HTO and DFO) on the pressure characteristics of the ankle joint. MATERIALS AND METHODS: Varus and valgus malalignment of the knee was simulated in human cadaver full-length legs. Testing included four measurements: baseline malalignment, 5° and 10° re-aligning osteotomy, and control baseline malalignment. For HTO, testing was rerun with the subtalar joint fixed. In order to represent half body weight, a 300 N force was applied onto the femoral head...
January 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28009709/the-effect-of-cervical-interbody-cage-morphology-material-composition-and-substrate-density-on-cage-subsidence
#15
Paul B Suh, Christian Puttlitz, Chad Lewis, B Sonny Bal, Kirk McGilvray
BACKGROUND: Interbody cages used in spinal fusion surgery can subside into the adjacent vertebral bodies after implantation, leading to loss of spinal height, malalignment, and possible radicular symptoms. Several factors may contribute to cage subsidence. METHODS: This in vitro investigation examined the possible contribution of substrate density, cage contact area (ie, cage footprint), cage filling, cage end plate surface texture, and cage material composition on the magnitude of subsidence...
February 2017: Journal of the American Academy of Orthopaedic Surgeons
https://www.readbyqxmd.com/read/27927541/is-there-a-gender-specific-full-body-sagittal-profile-for-different-spinopelvic-relationships-a-study-on-propensity-matched-cohorts
#16
Shaleen Vira, Bassel G Diebo, Matthew Adam Spiegel, Barthelemy Liabaud, Jensen K Henry, Jonathan H Oren, Renaud Lafage, Elizabeth M Tanzi, Themistocles S Protopsaltis, Thomas J Errico, Frank J Schwab, Virginie Lafage
DESIGN: Retrospective review. OBJECTIVE: To evaluate gender-related differences in compensatory recruitment to progressive sagittal malalignment. SUMMARY OF BACKGROUND DATA: Recent research has elucidated compensatory mechanisms recruited in response to sagittal malalignment, but gender-specific differences in compensatory recruitment patterns is unknown. METHODS: Single-center study of patients with full body x-rays...
March 2016: Spine Deformity
https://www.readbyqxmd.com/read/27916684/the-impact-of-obesity-on-compensatory-mechanisms-in-response-to-progressive-sagittal-malalignment
#17
Cyrus M Jalai, Bassel G Diebo, Dana L Cruz, Gregory W Poorman, Shaleen Vira, Aaron J Buckland, Renaud Lafage, Shay Bess, Thomas J Errico, Virginie Lafage, Peter G Passias
BACKGROUND CONTEXT: Obesity's impact on standing sagittal alignment remains poorly understood, especially with respect to the role of the lower limbs. Given energetic expenditure in standing, a complete understanding of compensation in obese patients with sagittal malalignment remains relevant. PURPOSE: This study compares obese and non-obese patients with progressive sagittal malalignment for differences in recruitment of pelvic and lower-limb mechanisms. STUDY DESIGN/SETTING: Single-center retrospective review...
December 1, 2016: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/27904790/current-concepts-in-the-treatment-of-gross-patellofemoral-instability
#18
Grant Buchanan, LeeAnne Torres, Brian Czarkowski, Charles E Giangarra
Patellofemoral instability is a painful and commonly recurring condition, which often must be managed surgically. Diagnosis can be aided by the use of a variety of physical exam signs, such as the Q angle, Beighton hypermobility score, glide test, J sign, patellar tilt test, and apprehension test. Imaging modalities including x-ray, CT, and MRI guide both diagnosis and management by revealing trochlear dysplasia, bony malalignment, and ligamentous injury that contribute to instability. Following an initial patellar dislocation, nonoperative management with bracing and physical therapy is an acceptable option, despite limited evidence that operative management may improve functional outcome and reduce recurrent dislocations...
December 2016: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/27890891/mid-term-clinical-results-of-versys-hip-system-zimmer-uncemented-total-hip-replacement-arthroplasty
#19
Hidemi Kawaji, Takuya Uematsu, Naoya Hoshikawa, Hiroshi Watanabe, Shinro Takai
Recent reports suggest that uncemented total hip replacement arthroplasty (THR) results in favorable short- to mid-term clinical results. In the present study, we assessed the mid-term clinical results of VerSys Hip System uncemented THR at our hospital. MATERIALS AND METHODS: We studied patients who received THR using VerSys Hip System and who could be followed-up more than 3 years. Clinical records were used to retrospectively identify patient characteristics, which included age, gender, disease requiring THR, preoperative and postoperative pain score of the Japan Orthopaedic Association scoring system, range of motion in flexion and abduction, operating time, intraoperative complication, and additional operation or revision surgery...
2016: Journal of Nippon Medical School, Nippon Ika Daigaku Zasshi
https://www.readbyqxmd.com/read/27856127/radiographic-assessment-of-knee-ankle-alignment-after-total-knee-arthroplasty-for-varus-and-valgus-knee-osteoarthritis
#20
Fuqiang Gao, Jinhui Ma, Wei Sun, Wanshou Guo, Zirong Li, Weiguo Wang
BACKGROUND: There are unanswered questions about knee-ankle alignment after total knee arthroplasty (TKA) for varus and valgus osteoarthritis (OA) of the knee. The aim of this retrospective study was to assess knee-ankle alignment after TKA. METHODS: The study consisted of 149 patients who had undergone TKA due to varus and valgus knee OA. The alignment and angles in the selected knees and ankles were measured on full-length standing anteroposterior radiographs, both pre-operatively and post-operatively...
November 14, 2016: Knee
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