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Safe zone total hip

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https://www.readbyqxmd.com/read/28641967/fluoroscopically-guided-acetabular-component-positioning-does-it-reduce-the-risk-of-malpositioning-in-obese-patients
#1
Raul G Gosthe, Juan C Suarez, Colin A McNamara, Cecilia Calvo, Preetesh D Patel
BACKGROUND: Obesity has been described as an independent risk factor for acetabular component malpositioning. The purpose of this study was to determine if this could be overcome by use of fluoroscopic navigation in total hip arthroplasty (THA). METHODS: The first, postoperative, standing, anteroposterior pelvis radiographs from 1599 consecutive patients who underwent fluoroscopic-guided THAs via anterior approach during a six-year period were obtained. We retrospectively reviewed this prospectively collected data...
May 5, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28629942/can-a-target-zone-safer-than-lewinnek-s-safe-zone-be-defined-to-prevent-instability-of-total-hip-arthroplasties-case-control-study-of-56-dislocated-tha-and-93-matched-controls
#2
N Reina, S Putman, R Desmarchelier, E Sari Ali, P Chiron, M Ollivier, J Y Jenny, D Waast, C Mabit, E de Thomasson, C Schwartz, P Oger, L E Gayet, H Migaud, N Ramdane, M H Fessy
BACKGROUND: Various factors contribute to instability of total hip arthroplasty (THA), with implant orientation being a major contributor. We performed a case-control study with computed tomography (CT) data to determine whether 1) orientation contributes to THA instability and 2) a safer target zone for stability than Lewinnek's classic safe zone can be defined. MATERIAL AND METHODS: We included prospectively 363 cases of THA dislocation that occurred during the calendar 2013 year in 24 participating hospitals...
June 16, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28625687/can-surgeons-reduce-the-risk-for-dislocation-after-primary-total-hip-arthroplasty-performed-using-the-posterolateral-approach
#3
Kurt G Seagrave, Anders Troelsen, Bjørn G Madsen, Henrik Husted, Thomas Kallemose, Kirill Gromov
BACKGROUND: Hip dislocation is one of the most common postoperative complications after total hip arthroplasty (THA). Potential contributors include patient- and surgical-related factors. We performed a retrospective cohort study to identify risk factors for postoperative dislocation in patients receiving THA via the posterolateral approach. METHODS: We assessed 1326 consecutive primary THAs performed between 2010 and 2015. Patient information was documented, and plain radiographic films were used to evaluate cup positioning, hip offset, and hip length change...
May 4, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28623889/surgical-accuracy-function-and-quality-of-life-of-simultaneous-versus-staged-bilateral-total-hip-arthroplasty-in-patients-with-osteonecrosis-of-the-femoral-head
#4
Seung-Chan Kim, Young-Wook Lim, Woo-Lam Jo, Dong-Chul Park, Jin-Woo Lee, Won-Woo Kang, Yong-Sik Kim
BACKGROUND: The optimal surgical option for patients requiring bilateral hip replacement remains controversial. The purpose of this study was to compare surgical accuracy; functional outcome and health-related quality of life; and prosthetic-related complications and revision surgery of a simultaneous bilateral total hip arthroplasty (THA) with those of a staged bilateral THA with an interval between procedures <12 months. METHODS: A total of 123 unselected consecutive patients (mean age, 43...
June 17, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28574117/combined-anteversion-technique-in-total-hip-arthroplasty-for-crowe-iv-developmental-dysplasia-of-the-hip
#5
Biao Zhu, Changzheng Su, Yeteng He, Xingyu Chai, Zhen Li, Zhenyang Hou, Tengteng Lou, Xinfeng Yan
BACKGROUND: A high rate of postoperative dislocation in total hip arthroplasty (THA) for Crowe IV developmental dysplasia of the hip (DDH) has been reported, 1 of the main reasons being higher true acetabular anteversion. If the cup is fixed with normal anteversion, the anterior rim will be excessively exposed, which reduces the contact areas of the cup and bone, affects prosthesis stability, and leads to iliopsoas tendinitis and persistent hip pain after THA. The aim of this study was to demonstrate that when cup anteversion is larger, adjusting femoral anteversion to bring the combined anteversion (CA) into the "safe zone" might prevent dislocation...
May 27, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/28567577/does-the-surgical-approach-influence-the-implant-alignment-in-total-hip-arthroplasty-comparative-study-between-the-direct-anterior-and-the-anterolateral-approaches-in-the-supine-position
#6
Yuya Kawarai, Satoshi Iida, Junichi Nakamura, Yoshiyuki Shinada, Chiho Suzuki, Seiji Ohtori
PURPOSE: The purpose of this study was to clarify the difference in implant alignment between the direct anterior approach (DAA) and the anterolateral approach in the supine position (ALS). METHODS: A retrospective comparative study consisted of 215 consecutive primary total hip arthroplasties using tapered polished and straight cemented-stems via two different minimally invasive approaches (DAA group in 106 hips and ALS group in 109 hips). RESULTS: The cup radiographic anteversion angle was significantly lower in the ALS group than in the DAA group (12...
May 31, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28559196/quantifying-pelvic-motion-during-total-hip-arthroplasty-using-a-new-surgical-navigation-device
#7
Ran Schwarzkopf, Jeffrey M Muir, Wayne G Paprosky, Scott Seymour, Michael B Cross, Jonathan M Vigdorchik
BACKGROUND: Accurate cup positioning is one of the most challenging aspects of total hip arthroplasty (THA). Undetected movement of the patient during THA surgery can lead to inaccuracies in cup anteversion and inclination, increasing the potential for dislocation and revision surgery. Investigations into the magnitude of patient motion during THA are not well represented in the literature. METHODS: We analyzed intraoperative pelvic motion using a novel navigation device used to assist surgeons with cup position, leg length, and offset during THA...
May 4, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28542504/level-of-surgical-experience-is-associated-with-change-in-hip-center-of-rotation-following-cementless-total-hip-arthroplasty-a-radiographic-assessment
#8
Seung-Chan Kim, Young-Wook Lim, Soon-Yong Kwon, Woo-Lam Jo, Sung-Hun Ju, Chan-Joo Park, Choong-Woo Lee, Yong-Sik Kim
OBJECTIVES: After total hip arthroplasty (THA), restoration of hip center of rotation (COR) is essential to ensure stability of the prosthetic hip and longevity of the prosthesis. Our aim was to determine whether, and how, the COR changed postoperatively compared to the native COR following implantation of a cementless acetabular component in anatomical position and to compare the accuracy of cup placement between two surgeons with different levels of surgical experience. MATERIALS AND METHODS: We evaluated 145 patients (145 hips) who underwent unilateral primary THA, who had no distorted acetabulum on the affected hip and a normal contralateral hip...
2017: PloS One
https://www.readbyqxmd.com/read/28537647/robotic-assisted-total-hip-arthroplasty-outcomes-at-minimum-two-year-follow-up
#9
Richard L Illgen, Brandon R Bukowski, Rasheed Abiola, Paul Anderson, Morad Chughtai, Anton Khlopas, Michael A Mont
BACKGROUND: Component malposition in total hip arthroplasty (THA) contributes to instability and early failure. Robotic-assisted total hip arthroplasty (rTHA) utilizes CT-based planning with haptically-guided bone preparation and implant insertion to optimize component position accuracy. This study compared acetabular component position and postoperative complications following manual THA (mTHA) with rTHA. MATERIALS AND METHODS: Consecutive primary THAs performed by one surgeon at three intervals were analyzed in this retrospective cohort study: the initial 100 consecutive manual THAs (mTHA) in clinical practice (year 2000), the last consecutive 100 mTHA before rTHA introduction (year 2011), and the first consecutive 100 rTHA (year 2012)...
May 24, 2017: Surgical Technology International
https://www.readbyqxmd.com/read/28506299/developmental-hip-dysplasia-treated-by-total-hip-arthroplasty-using-a-cementless-wagner-cone-stem-in-young-adult-patients-with-a-small-physique
#10
Ping Zhen, Jun Liu, Hao Lu, Hui Chen, Xusheng Li, Shenghu Zhou
BACKGROUND: Developmental hip dysplasia (DDH) may lead to severe acetabular and femoral abnormalities that can render total hip arthroplasty (THA) challenging, especially in DDH patients with a small physique. Most conventional cemented or cementless femoral components are often difficult to implant in the narrow femoral canal and require slight version correction during surgery. The aim of this study was to present the mid-term results of THA in the treatment of DDH patients with a small physique using a cementless Wagner cone prosthesis (Zimmer®, US)...
May 15, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28499624/acetabular-placement-accuracy-with-the-direct-anterior-approach-freehand-technique
#11
Melissa C Soderquist, Ryan Scully, Anthony S Unger
BACKGROUND: Acetabular cup placement in total hip arthroplasty (THA) has been recognized as an important factor in operative success, and accurate cup placement has been the impetus for novel medical technologies. METHODS: This article examines the cup placement in 955 THAs using a freehand Direct Anterior Approach on a standard operating table. Acetabular anteversion and inclination were determined using the circle theorem. Measurements were divided into safe zone placement determined by Callanan et al as 5°-25° for anteversion and 30°-45° for inclination, as well as by Lewinnek et al as 5°-25° for anteversion and 30°-50° for inclination...
April 18, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28385170/danish-survey-of-acetabular-component-positioning-practice-during-primary-total-hip-arthroplasty
#12
Dana Cotong, Anders Troelsen, Henrik Husted, Kirill Gromov
INTRODUCTION: The Lewinnek and Callanan "safe zones" have been widely used to minimise the dislocation fre-quency in total hip arthroplasty (THA), but recent studies have questioned the association between "safe zones" and lower dislocation rates. The purpose of this study was to investigate: 1) if hip surgeons agree on a specific "safe zone" for cup positioning and 2) surgeons' surgical practice patterns regarding recurring instability in primary THA. METHODS: A survey was performed among hip surgeons during the 2015 Annual Meeting of the Danish Orthopaedic Society...
April 2017: Danish Medical Journal
https://www.readbyqxmd.com/read/28373138/the-influence-of-spine-hip-relations-on-total-hip-replacement-a-systematic-review
#13
REVIEW
C Rivière, J-Y Lazennec, C Van Der Straeten, E Auvinet, J Cobb, S Muirhead-Allwood
Sagittal pelvic kinematics along with spino-pelvic angular parameters have recently been studied by numerous investigators for their effect on total hip replacement (THR) clinical outcomes, but many issue of spine-hip relations (SHR) are currently unexplored. Therefore, our review aims at clarifying the following questions: is there any evidence of a relationship between articular impingement/dislocation risk in primary THR and (1) certain sagittal pelvic kinematics patterns, (2) pelvic incidence, and (3) types of SHRs? A systematic review of the existing literature utilising PubMed and Google search engines was performed in January 2017...
June 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28371783/monocular-vision-and-imu-based-system-for-prosthesis-pose-estimation-during-total-hip-replacement-surgery
#14
Shaojie Su, Yixin Zhou, Zhihua Wang, Hong Chen
The average age of population increases worldwide, so does the number of total hip replacement surgeries. Total hip replacement, however, often involves a risk of dislocation and prosthetic impingement. To minimize the risk after surgery, we propose an instrumented hip prosthesis that estimates the relative pose between prostheses intraoperatively and ensures the placement of prostheses within a safe zone. We create a model of the hip prosthesis as a ball and socket joint, which has four degrees of freedom (DOFs), including 3-DOF rotation and 1-DOF translation...
June 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28286463/range-of-movement-for-impingement-and-dislocation-avoidance-in-total-hip-replacement-predicted-by-finite-element-model
#15
Laura Ezquerra, María Paz Quilez, María Ángeles Pérez, Jorge Albareda, Belén Seral
Dislocation is a serious complication in total hip replacement (THR). An inadequate range of movement (ROM) can lead to impingement of the prosthesis neck on the acetabular cup; furthermore, the initiation of subluxation and dislocation may occur. The objective of this study was to generate a parametric three-dimensional finite element (FE) model capable of predicting the dislocation stability for various positions of the prosthetic head, neck, and cup under various activities. Three femoral head sizes (28, 32, and 36 mm) were simulated...
2017: Journal of Medical and Biological Engineering
https://www.readbyqxmd.com/read/28218372/chronological-changes-in-functional-cup-position-at-10-years-after-total-hip-arthroplasty
#16
Yusuke Okanoue, Masahiko Ikeuchi, Shogo Takaya, Masashi Izumi, Koji Aso, Teruhiko Kawakami
PURPOSE: This study aims to clarify the chronological changes in functional cup position at a minimum follow-up of 10 years after total hip arthroplasty (THA), and to identify the risk factors influencing a significant difference in functional cup position during the postoperative follow-up period. METHODS: We evaluated the chronological changes in functional cup position at a minimum follow-up of 10 years after THA in 58 patients with unilateral hip osteoarthritis...
February 15, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/28165597/increase-in-safe-zone-area-of-the-acetabular-cup-using-dual-mobility-cups-in-tha
#17
Takaaki Ohmori, Tamon Kabata, Toru Maeda, Yoshitomo Kajino, Tadashi Taga, Kazuhiro Hasegawa, Daisuke Inoue, Takashi Yamamoto, Tomoharu Takagi, Hiroyuki Tsuchiya
BACKGROUND: Dual mobility cup (DMC) inserts reduce the risk of dislocation after total hip arthroplasty (THA). No available research has clearly delineated stability advantages of DMC inserts in primary and revision THA. We investigated: (i) the degree of change in the safe zone of the cup when a DMC insert is used compared to a fixed insert; (ii) the method of selecting candidates for a DMC insert without changing the position of the acetabular (cup) component during revision THA in frequent dislocation cases caused by implant impingement...
January 30, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/28153459/total-hip-arthroplasty-in-the-spinal-deformity-population-does-degree-of-sagittal-deformity-affect-rates-of-safe-zone-placement-instability-or-revision
#18
Edward M DelSole, Jonathan M Vigdorchik, Ran Schwarzkopf, Thomas J Errico, Aaron J Buckland
BACKGROUND: Changes in spinal alignment and pelvic tilt alter acetabular orientation in predictable ways, which may have implications on stability of total hip arthroplasty (THA). Patients with sagittal spinal deformity represent a subset of patients who may be at particularly high risk of THA instability because of postural compensation for abnormal spinal alignment. METHODS: Using standing stereoradiography, we evaluated the spinopelvic parameters, acetabular cup anteversion, and inclination of 139 THAs in 107 patients with sagittal spinal deformity...
December 27, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28139342/revision-total-hip-arthroplasty-using-imageless-navigation-with-the-concept-of-combined-anteversion
#19
Jun-Dong Chang, In-Sung Kim, Sharad Prabhakar, Sameer A Mansukhani, Sang-Soo Lee, Je-Hyun Yoo
BACKGROUND: The purpose of the study was to evaluate the implant positions and clinical results of revision total hip arthroplasty (THA) using an imageless navigation with the concept of combined anteversion. METHODS: A total of 40 cementless revision THAs (24 men and 16 women) using an imageless navigation with the concept of combined anteversion were retrospectively evaluated. The concept of combined anteversion was applied in cup positioning based on Widmer's equation (cup anteversion + 0...
May 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28137262/direct-anterior-approach-for-total-hip-arthroplasty-with-a-novel-mobile-traction-table-a-prospective-cohort-study
#20
Junichi Nakamura, Shigeo Hagiwara, Sumihisa Orita, Ryuichiro Akagi, Takane Suzuki, Masahiko Suzuki, Kazuhisa Takahashi, Seiji Ohtori
BACKGROUND: The purpose of this prospective cohort study was to clarify the safety and efficacy of total hip arthroplasty via the direct anterior approach in the supine position with a novel mobile traction table. METHODS: The first experience of consecutive surgeries by a single surgeon using the direct anterior approach with a traction table is described with a two-year follow-up period. Of 121 patients, 100 patients without previous hip surgeries, severe deformity, or cemented implants were divided into two groups comprising the first 50 patients and the second 50 patients...
January 31, 2017: BMC Musculoskeletal Disorders
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