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https://www.readbyqxmd.com/read/29417324/radiological-severity-of-hip-osteoarthritis-in-patients-with-adult-spinal-deformity-the-effect-on-spinopelvic-and-lower-extremity-compensatory-mechanisms
#1
Louis M Day, Edward M DelSole, Bryan M Beaubrun, Peter L Zhou, John Y Moon, Jared C Tishelman, Jonathan M Vigdorchik, Ran Schwarzkopf, Renaud Lafage, Virginie Lafage, Themistocles Protopsaltis, Aaron J Buckland
PURPOSE: Sagittal spinal deformity (SSD) patients utilize pelvic tilt (PT) and their lower extremities in order to compensate for malalignment. This study examines the effect of hip osteoarthritis (OA) on compensatory mechanisms in SSD patients. METHODS: Patients ≥ 18 years with SSD were included for analysis. Spinopelvic, lower extremity, and cervical alignment were assessed on standing full-body stereoradiographs. Hip OA severity was graded by Kellgren-Lawrence scale (0-4)...
February 7, 2018: European Spine Journal
https://www.readbyqxmd.com/read/29409214/posterolateral-plate-fixation-with-talarlock%C3%A2-is-more-stable-than-screw-fixation-in-ankle-arthrodesis-in-a-biomechanical-cadaver-study
#2
N Gutteck, H Martin, T Hanke, J B Matthies, A Heilmann, H Kielstein, G Gradl, K S Delank, D Wohlrab
BACKGROUND: A number of studies report on limitations of the screw arthrodesis in severe malalignment of the hindfoot, neuropathic deformity, poor bone quality and osteoporosis. METHODS: Fourteen anatomically correct polyurethane foam models of the right leg (Sawbones Europe, Malmö, Sweden) and eighteen fresh-frozen human lower leg specimens (9 pairs) were used for the comparative biomechanical testing. RESULTS: The statistical analysis of the stiffness of the fixation developed a significant difference in favor of the plate in all test directions...
February 20, 2017: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29380010/increases-in-tibial-force-imbalance-but-not-changes-in-tibiofemoral-laxities-are-caused-by-varus-valgus-malalignment-of-the-femoral-component-in-kinematically-aligned-tka
#3
Jeremy Riley, Joshua D Roth, Stephen M Howell, Maury L Hull
PURPOSE: The purposes of this study were to quantify the increase in tibial force imbalance (i.e. magnitude of difference between medial and lateral tibial forces) and changes in laxities caused by 2° and 4° of varus-valgus (V-V) malalignment of the femoral component in kinematically aligned total knee arthroplasty (TKA) and use the results to detemine sensitivities to errors in making the distal femoral resections. Because V-V malalignment would introduce the greatest changes in the alignment of the articular surfaces at 0° flexion, the hypotheses were that the greatest increases in tibial force imbalance would occur at 0° flexion, that primarily V-V laxity would significantly change at this flexion angle, and that the tibial force imbalance would increase and laxities would change in proportion to the degree of V-V malalignment...
January 29, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29342496/-adverse-events-in-the-treatment-of-periprosthetic-fractures-around-the-knee-a-clinical-and-radiological-outcome-analysis
#4
Anna Janine Schreiner, Christoph Gonser, Christoph Ihle, Max Konstantin Zauleck, Tim Klopfer, Fabian Stuby, Ulrich Stöckle, Björn Gunnar Ochs
BACKGROUND: The incidence of periprosthetic fractures associated with total knee arthroplasty (PpFxK) has been reported to be 0.3 - 5.5%. 40% of all cases are related to revision TKA. The most common localisation is the distal femur. Classification is performed according to Rorabeck (RB). RB I - II fractures are usually treated with locked plating and retrograde intramedullary nailing, whereas RB III fractures are an indication for revision arthroplasty using a hinged endoprosthesis...
January 17, 2018: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/29248781/drivers-of-cervical-deformity-have-a-strong-influence-on-achieving-optimal-radiographic-and-clinical-outcomes-at-1-year-following-cervical-deformity-surgery
#5
Peter G Passias, Cole Bortz, Samantha Horn, Frank Segreto, Gregory Poorman, Cyrus Jalai, Alan Daniels, D Kojo Hamilton, Han Jo Kim, Daniel Sciubba, Justin S Smith, Brian Neuman, Christopher Shaffrey, Virginie Lafage, Themistocles Protopsaltis, Christopher Ames, Robert Hart, Gregory Mundis, Robert Eastlack
OBJECTIVE: The primary driver (PD) of cervical malalignment is important in characterizing cervical deformity(CD) and should be included in fusion to achieve alignment and quality-of-life goals. This study aims to define how PDs improve understanding of the mechanisms of cervical deformity, and assesses the impact of driver region on re-alignment/outcomes. METHODS: Inclusion: radiographic cervical deformity, >18 years, 1-year follow-up. PD apex was classified by spinal region: cervical, cervicothoracic junction(CTJ), thoracic, or spino-pelvic by panel of spine deformity surgeons...
December 14, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29237432/multiple-drill-hole-osteotomy-in-hand-surgery-description-of-a-novel-application-and-proof-of-feasibility
#6
T Haider, D Geisler, G Thalhammer, J Erhart
BACKGROUND: Malunion of phalangeal and metacarpal bones are often associated with impairment of hand function and pose a challenging task for treating surgeons in most cases. When applicable, corrective osteotomy is the treatment of choice, where the affected bone is cut to correct malalignment using chisels or saws. The use of these instruments is associated with several drawbacks especially in hand surgery. We aimed to determine whether a multiple drill-hole (MDH) osteotomy technique was suitable for performing corrective osteotomies of metacarpal and phalangeal bones...
December 13, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29218364/ultrasound-evaluation-of-stress-injuries-and-physiological-adaptations-in-the-fingers-of-adolescent-competitive-rock-climbers
#7
Kathryn Garcia, Diego Jaramillo, Erika Rubesova
BACKGROUND: The impact of high-intensity, repetitive training on the fingers of adolescent climbers is relatively unknown. OBJECTIVE: To evaluate this effect by ultrasound (US) and to confirm some findings by magnetic resonance imaging (MRI). MATERIALS AND METHODS: The US study was performed in 20 adolescent rock climbers (ages 10-17 years) and 6 non-climbing controls (ages 11-15 years). US was used to examine the third digit of the right hand for differences in thickness of soft tissue, flexor and extensor tendon, volar plate and bony and growth plate adaptations...
December 7, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/29181558/internal-external-malalignment-of-the-femoral-component-in-kinematically-aligned-total-knee-arthroplasty-increases-tibial-force-imbalance-but-does-not-change-laxities-of-the-tibiofemoral-joint
#8
Jeremy Riley, Joshua D Roth, Stephen M Howell, Maury L Hull
PURPOSE: The purposes of this study were to quantify the increase in tibial force imbalance (i.e. magnitude of difference between medial and lateral tibial forces) and changes in laxities caused by  2° and 4° of internal-external (I-E) malalignment of the femoral component in kinematically aligned total knee arthroplasty. Because I-E malalignment would introduce the greatest changes to the articular surfaces near 90° of flexion, the hypotheses were that the tibial force imbalance would be significantly increased near 90° flexion and that primarily varus-valgus laxity would be affected near 90° flexion...
November 27, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28976431/global-alignment-and-proportion-gap-score-development-and-validation-of-a-new-method-of-analyzing-spinopelvic-alignment-to-predict-mechanical-complications-after-adult-spinal-deformity-surgery
#9
Caglar Yilgor, Nuray Sogunmez, Louis Boissiere, Yasemin Yavuz, Ibrahim Obeid, Frank Kleinstück, Francisco Javier Sánchez Pérez-Grueso, Emre Acaroglu, Sleiman Haddad, Anne F Mannion, Ferran Pellise, Ahmet Alanay
BACKGROUND: The restoration of normal sagittal alignment is a critical goal in adult spinal deformity surgery to achieve favorable outcomes and prevent mechanical complications. Schwab sagittal modifiers have been accepted as targets for appropriate alignment, but addressing these targets does not always prevent high mechanical complication or revision rates. This may be because the linear absolute numerical parameters do not cover the whole pelvic incidence spectrum and the distribution of lordosis, pelvic anteversion, and negative malalignment are not considered as potential causes of failure...
October 4, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28966382/role-of-high-tibial-osteotomy-in-cartilage-regeneration-is-correction-of-malalignment-mandatory-for-success
#10
Matthew Dhanaraj Thambiah, Melvin K L Tan, James H P Hui
Malalignment of the knee can cause debilitating symptoms such as pain, resulting in a decline in function and mobility. Surgical options that exist to address this problem include realignment osteotomies and joint replacements. Realignment osteotomies are the more appropriate options in certain patient populations, especially with regard to age and level of activity. Since a high tibial osteotomy (HTO) was first used to manage malalignment of the knee and osteoarthritis, different techniques involving the use of specialized implants have been developed and further refined to good effect...
September 2017: Indian Journal of Orthopaedics
https://www.readbyqxmd.com/read/28951637/dynamic-locked-plating-for-fixation-of-distal-femur-fractures-using-near-cortical-over-drilling-preliminary-results-of-a-prospective-observational-study
#11
Sherif Galal
INTRODUCTION: Nonunion after locked plating of distal femur fractures is not uncommon. Authors wanted to assess if "Dynamic" locked plating using near-cortex over-Drilling technique would provide a mechanical environment the promotes callus formation, thereby avoiding non-union encountered when applying locked plates with the conventional method. METHODS: This study was conducted at an academic Level 1 Trauma Center. This is a prospective study conducted from November 2015 to November 2016...
July 2017: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/28950349/primary-drivers-of-adult-cervical-deformity-prevalence-variations-in-presentation-and-effect-of-surgical-treatment-strategies-on-early-postoperative-alignment
#12
Peter G Passias, Cyrus M Jalai, Virginie Lafage, Renaud Lafage, Themistocles Protopsaltis, Subaraman Ramchandran, Samantha R Horn, Gregory W Poorman, Munish Gupta, Robert A Hart, Vedat Deviren, Alexandra Soroceanu, Justin S Smith, Frank Schwab, Christopher I Shaffrey, Christopher P Ames
BACKGROUND: Primary drivers (PDs) of adult cervical deformity (ACD) have not been described in relation to pre- and early postoperative alignment or degree of correction. OBJECTIVE: To define the PDs of ACD to understand the impact of driver region on global postoperative compensatory mechanisms. METHODS: Primary cervical deformity driver/vertebral apex level were determined: CS = cervical; CTJ = cervicothoracic junction; TH = thoracic; SP = spinopelvic...
August 5, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28949763/characterizing-constraining-forces-in-the-alignment-phase-of-orthodontic-treatment
#13
Christopher G Gibson, Feng-Chang Lin, Ceib Phillips, Alex Edelman, Ching-Chang Ko
OBJECTIVES: To describe the frictional forces (FF) that constrain wire sliding in the initial alignment phase of treatment using a new term, the "constraining force" (CF), and to hypothesize that CF is dependent on two factors: the hyperelastic behavior of archwires and the specific type of tooth geometric malalignment present. MATERIALS AND METHODS: A laboratory device that simulates the four distinct malalignment types (in-out, rotation, tipping, and vertical step) was used to couple with an Instron testing apparatus...
September 25, 2017: Angle Orthodontist
https://www.readbyqxmd.com/read/28948678/improving-the-human-robot-interface-for-telemanipulated-robotic-long-bone-fracture-reduction-joystick-device-vs-haptic-manipulator
#14
Eduardo M Suero, Tristan Hartung, Ralf Westphal, Nael Hawi, Emmanouil Liodakis, Musa Citak, Christian Krettek, Timo Stuebig
OBJECTIVES: Intramedullary nailing is the treatment of choice for femoral shaft fractures. However, there are several problems associated with the technique, e.g. high radiation exposure and rotational malalignment. Experimental robotic assistance has been introduced to improve the quality of the reduction and to reduce the incidence of rotational malalignment. In the current study, we compare two devices for control of the fracture fragments during telemanipulated reduction. METHODS: Ten male and ten female subjects were asked to participate as examiners in this experiment...
September 25, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28736125/minimally-invasive-treatment-of-displaced-femoral-shaft-fractures-with-a-teleoperated-robot-assisted-surgical-system
#15
Qing Zhu, Bin Liang, Xingsong Wang, Xiaogang Sun, Liming Wang
BACKGROUND: Minimally invasive surgical operation of intramedullary (IM) nailing is a standard technique for treating diaphyseal fractures. However, in addition to its advantages, there are some drawbacks such as the frequent occurrence of malalignment, physical fatigue and high radiation exposure to medical staff. The use of robotic and navigation techniques is promising treatments for femoral fractures. MATERIALS AND METHODS: This paper presents a novel robot-assisted manipulator for femoral shaft fracture reduction with indirect contact with the femur...
July 12, 2017: Injury
https://www.readbyqxmd.com/read/28656165/comparison-of-double-and-single-leg-weight-bearing-radiography-in-determining-knee-alignment
#16
Omid Yazdanpanah, Mahmood Karimi Mobarakeh, Masoud Nakhaei, Mohammad R Baneshi
BACKGROUND: Knee malalignment is an important modifiable cause of osteoarthritis (OA). Surgical therapeutic procedures depend on proper knee alignment assessment. The purpose of this study was to compare knee alignment parameters between double and single leg weight-bearing radiographs and to evaluate the reproducibility of inter- and intra-observer measurements. METHODS: One hundred eight patients (59 male and 49 female) with knee deformity visited at Kerman Knee Clinic were selected...
May 2017: Archives of Bone and Joint Surgery
https://www.readbyqxmd.com/read/28594528/international-perspective-on-revision-anterior-cruciate-ligament-reconstruction-what-have-we-been-missing
#17
Mohammad Humza Ansari, Steven Claes, Daniel C Wascher, Philippe Neyret, Michael J Stuart, Aaron J Krych
Primary anterior cruciate ligament (ACL) reconstruction is a common orthopaedic procedure. A graft failure rate of 5% to 10% after primary ACL reconstruction has resulted in an increased need for revision ACL reconstruction. ACL reconstruction failure etiologies include trauma, technical errors, and biologic factors. Based on the current literature, the outcomes of revision ACL reconstruction are clearly inferior compared with those of primary reconstruction. A thorough patient evaluation, including surgical history, a physical examination, and imaging studies, is crucial in the assessment of a failed ACL reconstruction...
February 15, 2017: Instructional Course Lectures
https://www.readbyqxmd.com/read/28578801/sagittal-tibiotalar-translation-and-clinical-outcomes-in-mobile-and-fixed-bearing-total-ankle-replacement
#18
Federico G Usuelli, Luigi Manzi, Giovanni Brusaferri, Robert E Neher, Matteo Guelfi, Camilla Maccario
BACKGROUND: Sagittal implant malalignment after total ankle replacement (TAR) has been considered to be a possible cause for premature implant failure. In a prior study, the change over time of the tibiotalar ratio (T-T ratio), which is the ratio between the posterior longitudinal talar length and the full longitudinal talar length, was assessed in 66 TARs where an unconstrained, mobile-bearing implant was implanted. The analysis documented an increase in the T-T ratio between 2 and 6 months post-surgery (on average from 34...
June 2017: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28501956/an-in-vitro-evaluation-of-sagittal-alignment-in-the-cervical-spine-after-insertion-of-supraphysiologic-lordotic-implants
#19
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
#20
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
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