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https://www.readbyqxmd.com/read/27913129/preoperative-planning-and-operative-techniques-of-the-shorter-tapered-stem-compared-to-the-metaphyseal-fit-stem-in-cementless-total-hip-arthroplasty
#1
Hiroshi Imai, Joji Miyawaki, Tomomi Kamada, Akira Maruishi, Jun Takeba, Hiromasa Miura
BACKGROUND: In order to prevent postoperative dislocation due to prosthetic impingement as a result of total hip arthroplasty (THA), the combined anteversion (CA) theory, which combines the anteversion of the femoral stem and the acetabular socket, has been revised in recent years. Particularly, it is necessary to keep CA within the target zone. METHODS: The aim of this study was to investigate whether postoperative CA can be kept within the target zone while using the operative technique which prepares the socket first in cementless THA, by estimating the anteversion of the metaphyseal fit stem or the shorter, tapered wedge stem using preoperative 3-dimensional computerized planning, and by adjusting the anteversion of the socket using a navigation system that considers CA...
November 10, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27911346/influence-of-pelvic-tilt-on-functional-acetabular-orientation
#2
Robert K Zahn, Sarah Grotjohann, Matthias Pumberger, Heiko Ramm, Stefan Zachow, Michael Putzier, Carsten Perka, Stephan Tohtz
BACKGROUND: Pelvic tilt influences acetabular orientation (AO). Anatomical AO can be measured in relation to the anterior pelvic plane (APP), functional AO can be calculated relative to table's plane. OBJECTIVE: To assess to what extent functional AO is determined by pelvic tilt and if APP and table plane give equal information for correct AO. METHODS: AO was evaluated by computed tomography (CT) scans of 138 patients. Pelvic tilt, anatomical and functional AO were measured, differences between the two reference planes were calculated...
November 25, 2016: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/27902635/correlation-between-transverse-plan-kinematics-and-foot-progression-angle-in-children-with-spastic-diplegia
#3
Ana Presedo, Anne-Laure Simon, Cindy Mallet, Brice Ilharreborde, Keyvan Mazda, Georges-François Pennecot
In diplegic patients, the orientation of foot progression depends on multiple factors. We investigated the relationship between foot progression alignment, hip and pelvic rotations during gait, femoral anteversion, and tibial torsion. Kinematic and clinical parameters were evaluated for 114 children who walked independently and had not undergone previous surgery. Causes of intoeing presented combined in 72% of cases. Internal foot progression correlated with internal hip rotation and showed an inverse correlation with tibial torsion...
November 29, 2016: Journal of Pediatric Orthopedics. Part B
https://www.readbyqxmd.com/read/27896435/course-of-pelvic-lift-during-total-hip-arthroplasty
#4
Steffen Brodt, Dimitri Nowack, Linda Krakow, Christoph Windisch, Georg Matziolis
INTRODUCTION: The position of the cup makes a major contribution to the success of total hip arthroplasty (THA). In conventional implantation of the prosthesis without navigation, the surgeon relies on the spatial position of the pelvis. However, iatrogenic manipulation of the pelvis during different surgical steps constantly changes the position of the pelvis during the operation. The position of the pelvis is substantial for the correct placement of the cup. The objective of this study was to investigate and visualize the course of this pelvic lift and correlate it to certain surgical steps...
November 28, 2016: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/27879150/acetabular-cup-position-and-risk-of-dislocation-in-primary-total-hip-arthroplasty
#5
Kurt G Seagrave, Anders Troelsen, Henrik Malchau, Henrik Husted, Kirill Gromov
Background and purpose - Hip dislocation is one of the most common complications following total hip arthroplasty (THA). Several factors that affect dislocation have been identified, including acetabular cup positioning. Optimal values for cup inclination and anteversion are debatable. We performed a systematic review to describe the different methods for measuring cup placement, target zones for cup positioning, and the association between cup positioning and dislocation following primary THA. Methods - A systematic search of literature in the PubMed database was performed (January and February 2016) to identify articles that compared acetabular cup positioning and the risk of dislocation...
November 23, 2016: Acta Orthopaedica
https://www.readbyqxmd.com/read/27858241/repeated-posterior-dislocation-of-total-hip-arthroplasty-after-spinal-corrective-long-fusion-with-pelvic-fixation
#6
Hiroki Furuhashi, Daisuke Togawa, Hiroshi Koyama, Hironobu Hoshino, Tatsuya Yasuda, Yukihiro Matsuyama
PURPOSE: Several reports have indicated that anterior dislocation of total hip arthroplasty (THA) can be caused by spinal degenerative changes with excessive pelvic retroversion. However, no reports have indicated that posterior dislocation can be caused by fixed pelvic anteversion after corrective spine surgery. We describe a rare case experiencing repeated posterior THA dislocation that occurred at 5 months after corrective spinal long fusion with pelvic fixation. METHODS: A 64-year-old woman had undergone bilateral THA at 13 years before presenting to our institution...
November 17, 2016: European Spine Journal
https://www.readbyqxmd.com/read/27853816/total-hip-arthroplasty-using-direct-anterior-approach-and-dual-mobility-cup-safe-and-efficient-strategy-against-post-operative-dislocation
#7
Cécile Batailler, Camdon Fary, Pierre Batailler, Elvire Servien, Philippe Neyret, Sébastien Lustig
AIM: We hypothesize that a dual mobility cup can be safely used via the direct anterior approach, without increasing the risk of complications or incorrect positioning. MATERIALS AND METHODS: This retrospective study compared 201 primary total hip arthroplasties using a dual mobility cup performed via direct anterior approach without a traction table, to 101 arthroplasties performed via posterolateral approach. Implant positioning, function scores, and early complications were recorded...
November 16, 2016: International Orthopaedics
https://www.readbyqxmd.com/read/27826701/a-cadaver-study-validating-ct-assessment-of-acetabular-component-orientation-the-perth-ct-hip-protocol
#8
Varun Arora, Richard Hannan, Richard Beaver, Timothy Fletcher, Paul Harvie
OBJECTIVE: The aim was to develop a CT-based protocol to accurately measure post-operative acetabular cup inclination and anteversion establishing which bony reference points facilitate the most accurate estimation of these variables. MATERIALS AND METHODS: An all-polyethylene acetabular liner was implanted into a cadaveric acetabulum. A conventional pelvic CT scan was performed and reformatted images created in both functional and anterior pelvic planes. CT images were transferred to a Freedom-Plus Graphics software package enabling an identical, virtual 3D model of the cadaveric pelvis to be created and definitive acetabular cup orientation established...
November 8, 2016: Skeletal Radiology
https://www.readbyqxmd.com/read/27816389/biomechanical-optimization-of-the-angle-and-position-for-surgical-implantation-of-a-straight-short-stem-hip-implant
#9
Gillian E Cook, Saeid Samiezadeh, Zachary Morison, Mina S R Aziz, Habiba Bougherara, Radovan Zdero, Emil H Schemitsch
Conservative hip implants preserve healthy bone for revision surgeries and improve physiological loading; however, they have little supporting biomechanical data with respect to their 3D orientation during implantation. This study endeavored to determine the optimal 3D orientation of a straight short stem hip implant within the proximal femur that would yield a stress distribution most similar to an intact femur. Synthetic femurs were implanted with a stem in one of seven maximum angles or positions and axially loaded, with resultant strain values used to validate a finite element model...
November 2, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27816368/a-validated-single-view-radiographic-alternative-to-computed-tomography-for-the-measurement-of-femoral-anteversion-a-method-comparison-study
#10
Adam R Boissonneault, Takafumi Hiranaka, James R Roberson, Thomas L Bradbury
BACKGROUND: Although preoperative templating in total hip arthroplasty is helpful to ensure appropriate component position, there is no single-view radiographic method to determine femoral anteversion (FA) preoperatively. The aim of the present study was to validate the use of radiographic measurement of FA using a modified Budin view. METHODS: This prospective study reports on 105 limbs from 65 patients. Computed tomography (CT) scans and radiographs were obtained to measure native FA...
September 28, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27803227/comparison-of-measurements-of-the-glenopolar-angle-in-3d-ct-reconstructions-of-the-scapula-and-2d-plain-radiographic-views
#11
T Suter, H B Henninger, Y Zhang, J D Wylie, R Z Tashjian
AIMS: The aim of this study was to analyse the effect of altered viewing perspectives on the measurement of the glenopolar angle (GPA) and the differences between these measurements made on 3D CT reconstructions and anteroposterior (AP) scapular view radiographs. MATERIALS AND METHODS: The influence of the viewing perspective on the GPA was assessed, as were the differences in the measurements of the GPA between 3D CT reconstructions and AP scapular view radiographs in 68 cadaveric scapulae...
November 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27802254/t1-pelvic-angle-is-a-useful-parameter-for-postoperative-evaluation-in-adult-spinal-deformity-patients
#12
Tomohiro Banno, Tomohiko Hasegawa, Yu Yamato, Sho Kobayashi, Daisuke Togawa, Shin Oe, Yuki Mihara, Yukihiro Matsuyama
STUDY DESIGN: Retrospective review. OBJECTIVE: We investigated validity of T1 pelvic angle (TPA) for postoperative assessment and determined its target value for corrective scoliosis surgery. SUMMARY OF BACKGROUND DATA: TPA is a novel spinopelvic parameter accounting for both pelvic retroversion and trunk anteversion. As an angle, it is less affected by posture and correlates well with health-related quality of life in adult spinal deformity patients...
November 1, 2016: Spine
https://www.readbyqxmd.com/read/27789098/analysis-of-the-pelvic-functional-orientation-in-the-sagittal-plane-a-radiographic-study-with-eos-2d-3d-technology
#13
Mattia Loppini, Umile Giuseppe Longo, Pasquala Ragucci, Nicoletta Trenti, Luca Balzarini, Guido Grappiolo
BACKGROUND: We investigated the relationship between pelvic incidence (PI) with anterior pelvic plane angle (APPA), pelvic tilt (PT) angle, and sacral slope (SS) in standing and sitting positions to identify the best parameter expressing the pelvic functional orientation in the sagittal plane. METHODS: We enrolled 109 consecutive patients (M:F = 43:66) eligible for a primary total hip arthroplasty (THA) with an average age of 63.4 years (15-85). EOS 2D/3D radiography was performed in standing and sitting positions before THA to evaluate the functional pelvic orientation...
September 28, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27777916/result-of-modular-necks-in-primary-total-hip-arthroplasty-with-a-average-follow-up-of-four-years
#14
Jemin Yi, Kye Young Han, Young Jun Nam, Keun Woo Kim
PURPOSE: This study aimed to investigate the outcomes of modular neck-utilization in primary total hip arthroplasty (THA). MATERIALS AND METHODS: Thirty patients (34 hips) who had modular stem THA between April 2011 and January 2013 were evaluated. There were 19 men and 11 women with a mean age of 61.2 years at the time of surgery. There were 20 cases of osteonecrosis of femoral head, 7 cases of osteoarthritis, 6 cases of femur neck fracture, and 1 case of rheumatoid arthritis...
September 2016: Hip & Pelvis
https://www.readbyqxmd.com/read/27765343/anatomical-causes-of-difficult-embryo-transfer-during-in-vitro-fertilization
#15
L Larue, G Keromnes, A Massari, C Roche, D Bouret, N G Cassuto, J P Ayel
OBJECTIVES: Identify, define and validate through statistical analysis the anatomical causes of difficult embryo transfers (ET). MATERIALS AND METHODS: This observational study, carried out in 306 IVF candidates, compared the frequency of anatomical anomalies of the uterus and cervix in women who underwent an easy ET with that in women who underwent a difficult ET. Anatomical anomalies were detected during an assessment of the cervix and uterus including transvaginal ultrasound, hysteroscopy and a mock transfer...
October 17, 2016: Journal de Gynécologie, Obstétrique et Biologie de la Reproduction
https://www.readbyqxmd.com/read/27757494/can-the-crossover-sign-be-a-reliable-marker-of-global-retroversion-of-the-acetabulum
#16
Seyed Ali Hashemi, Javad Dehghani, Amir Reza Vosoughi
OBJECTIVE: Diagnosis of acetabular retroversion based on crossover sign in the anteroposterior radiograph of the hip joint is well described. Accuracy of the crossover sign to identify global retroversion of the acetabulum in comparison to version of the acetabulum in reconstructed three-dimensional computed tomography (3D CT) scan of the hip was the aim of this study. MATERIALS AND METHODS: X-rays of 500 hips were assessed regarding presence of crossover sign and its location in the upper, middle, or lower third of the acetabulum...
January 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/27752989/femoral-morphology-in-the-dysplastic-hip-three-dimensional-characterizations-with-ct
#17
Joel Wells, Jeffrey J Nepple, Karla Crook, James R Ross, Asheesh Bedi, Perry Schoenecker, John C Clohisy
BACKGROUND: Hip dysplasia represents a spectrum of complex deformities on both sides of the joint. Although many studies have described the acetabular side of the deformity, to our knowledge, little is known about the three-dimensional (3-D) head and neck offset differences of the femora of dysplastic hips. A thorough knowledge of proximal femoral anatomy is important to prevent potential impingement and improve results after acetabular reorientation. QUESTIONS/PURPOSES: (1) Are there common proximal femoral characteristics in patients with symptomatic hip dysplasia undergoing periacetabular osteotomy (PAO)? (2) Where is the location of maximal femoral head and neck offset deformity in hip dysplasia? (3) Do certain subgroups of dysplastic hips more commonly have cam-type femoral morphology? (4) Is there a relationship between hip ROM as well as impingement testing and 3-D head and neck offset deformity? METHODS: Using our hip preservation database, 153 hips (148 patients) underwent PAO from October 2013 to July 2015...
October 17, 2016: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/27739572/early-catastrophic-failure-of-a-pinnacle-marathon%C3%A2-polyethylene-acetabular-liner-a-report-of-a-malpositioned-pinnacle-duofix-ha%C3%A2-acetabular-shell-resulting-in-point-loading-and-accelerated-wear
#18
Daniel S Hill, Kuntal Patel, Deepak Herlekar
BACKGROUND: Highly cross-linked polyethylene in total hip arthroplasty (THA) has been shown to decrease wear rate compared with a conventional polyethylene liner. However, it has also been reported that the manufacturing processes can cause early failure of the implant. CASE: We describe early catastrophic failure at <4 years following primary THA surgery of a PINNACLE MARATHON® polyethylene acetabular liner resulting from a malaligned PINNACLE DUOFIX HA® acetabular shell with resultant point loading...
October 13, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27739568/impact-of-individual-anatomy-on-the-benefit-of-cup-medialisation-in-total-hip-arthroplasty
#19
Alexandre Terrier, Valérie Parvex, Hannes A Rüdiger
INTRODUCTION: In total hip arthroplasty, cup medialisation with compensatory increase of femoral offset has been proposed to increase the moment arms of abductor muscles. However, this technique is associated with a loss of acetabular bone stock. Previous data indicates that the potential benefit is not constant among patients and is likely related to patient anatomy. METHOD: Therefore, to be able to select patients who would benefit most from this technique, we measured several anatomical parameters of the pelvis and femur in 15 patients; and evaluated correlations between them and the changes of moment arms associated with cup medialisation...
October 8, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27728947/novel-patient-specific-instruments-for-acetabular-preparation-and-cup-placement
#20
Ran Schwarzkopf, Erik Schnaser, Taiki Nozaki, Yasuhito Kaneko, Michael J Gillman
INTRODUCTION: Patient-specific implants and instruments (PSI) have been used in both knee and shoulder replacements due to the perceived benefits of improved surgical accuracy and efficiency. The proposed benefits of using a PSI in total hip arthroplasty (THA) are numerous and include reduction of operative time and improved mechanical and anatomical alignment leading to increased implant longevity, increased stability, and clinical outcomes. We describe a novel patient-specific instrumentation and a surgical method that may improve directed resection of acetabular bone and accurate cup placement during THA...
October 6, 2016: Surgical Technology International
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