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posterior tilt

Chris Yin Wei Chan, Chee Kidd Chiu, Xin Yi Ler, Yun Hui Ng, Xue Han Chian, Pheng Hian Tan, Mun Keong Kwan
STUDY DESIGN: Retrospective study. OBJECTIVE: To investigate the association between postoperative upper instrumented vertebra (UIV) Tilt Angle with postoperative medial shoulder and neck imbalance. SUMMARY OF BACKGROUND DATA: Studies had found that current recommendations for UIV selection were not predictive of good postoperative shoulder balance. METHODS: 98 AIS patients with Lenke 1/2 curves who underwent posterior spinal fusion between 2013 and 2014 with minimum follow up of 2 years were recruited...
March 19, 2018: Spine
Koji Murakami, Satoshi Hamai, Ken Okazaki, Satoru Ikebe, Hidehiko Higaki, Takeshi Shimoto, Yasuharu Nakashima
PURPOSE: Neutral lower limb alignment does not necessarily produce a horizontal joint line after total knee arthroplasty (TKA). The orientation of the pre- and postoperative tibial mechanical axes (TMAs-G), tibial component, and joint line relative to the ground were evaluated. METHODS: The study group included 46 knees, 23 posterior-stabilized (PS) and 23 bicruciate-stabilized (BCS) TKAs. Using whole-leg standing radiographs, the static orientation of the pre- and postoperative TMAs-G and the tibial component as well as the postoperative alignment were measured...
March 20, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Y C Yin, R P Zhang, S L Li, Z Y Hou, W Chen, Y Z Zhang
Objective: To evaluate the possibility of transverse sacroiliac screw placement in different segments of the sacrum. Methods: Data of 80 pelvic CT scans (slice thickness ≤1.0 mm) archived in CT department of the Third Hospital of Hebei Medical University from September 2016 to October 2017 were retrospectively collected. Mimics software was used to rebuild the pelvis three-dimensional model. According to whether the sacral 1(S(1)) segment could place the transverse sacroiliac screws or not, all the sacrums were divided into normal group ( n =55) and dysmorphic group ( n =25)...
March 1, 2018: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
Joseph A Toljanic, Karl Ekstrand, Russell A Baer, Andreas Thor
PURPOSE: The purpose of this study was to retrospectively compare long-term outcomes for immediately loaded tilted and axial implants placed in the posterior region of the edentulous maxillary arch. MATERIALS AND METHODS: Data obtained from a 5-year prospective study designed to assess clinical outcomes following immediate loading of implants with screw-retained fixed restorations in the edentulous maxillary arch were retrospectively reviewed. Where insufficient alveolar bone was available for axial placement of the posterior-most implant on each side of the arch, tilted placement was employed...
March 2018: International Journal of Oral & Maxillofacial Implants
Hamed A Hamed, Hamdy A Marzook, Nahed E Ghoneem, Mohamed I El-Anwar
AIM: This study aimed to evaluate the effect of different implant angulations in posterior maxilla on stress distribution by finite element analysis and verify its results experimentally. METHODS: Two simplified models were prepared for an implant placed vertically and tilted 25° piercing the maxillary sinus. Geometric models' components were prepared by Autodesk Inventor then assembled in ANSYS for finite element analysis. The results of finite element analysis were verified against experimental trials results which were statistically analysed using student t-test (level of significance p < 0...
February 15, 2018: Open Access Macedonian Journal of Medical Sciences
William S Murphy, Ho Hyun Yun, Brett Hayden, Jens H Kowal, Stephen B Murphy
BACKGROUND: Cup malposition is a common cause of impingement, limitation of ROM, acceleration of bearing wear, liner fracture, and instability in THA. Previous studies of the safe zone based on plain radiographs have limitations inherent to measuring angles from two-dimensional projections. The current study uses CT to measure component position in stable and unstable hips to assess the presence of a safe zone for cup position in THA. QUESTIONS/PURPOSES: (1) Does acetabular component orientation, when measured on CT, differ in stable components and those revised for recurrent instability? (2) Do CT data support historic safe zone definitions for component orientation in THA? METHODS: We identified 34 hips that had undergone revision of the acetabulum for recurrent instability that also had a CT scan of the pelvis between August 2003 and February 2017...
February 2018: Clinical Orthopaedics and related Research
Turgut Akgül, Kerim Sarıyılmaz, Murat Korkmaz, Okan Özkunt, Özcan Kaya, Fatih Dikici
Study Design: Retrospective analysis of adolescent idiopathic scoliosis. Purpose: This study aimed to investigate the influence of distinct distal fusion levels on spinopelvic parameters in patients with adolescent idiopathic scoliosis (AIS) who underwent posterior instrumentation and fusion surgery. Overview of Literature: The distal fusion level selection in treatment of AIS is the one of milestone to effect on surgical outcome. Most of the paper focused on the coronal deformity correction and balance...
February 2018: Asian Spine Journal
Nima Khavanin, Edward H Davidson, Diana Y Lee, Patrick Byrne, Amir H Dorafshar
Concomitant temporomandibular joint (TMJ) transplantation is an obvious advancement in the reconstructive armamentarium for face transplantation in scenarios involving TMJ ankylosis. This study investigates the fidelity of mandibular morphology and explores the feasibility of bilateral mandibular condyle transfer in facial vascularized composite allotransplantation. Geometric analysis was performed on 100 skeletally mature maxillofacial computed tomography scans. Exclusion criteria included mandibular trauma and dentoalveolar disease...
March 1, 2018: Journal of Craniofacial Surgery
Shaofu Wang, Jing Li, Guohua Lü, Bing Wang, Xiaobin Wang
PURPOSE: Hemivertebra of the cervical spine is a rare but complex spinal malformation. To our knowledge, only one publication describes excision of an upper-middle cervical (between C2 and C4) hemivertebra. We present our experience with two cases of C3 hemivertebra resection and torticollis correction via a combined anterior-posterior-anterior surgical approach and short segment fixation. METHODS: Two 12-year-old patients with torticollis due to congenital C3 hemivertebra underwent surgery consisting of combined anterior vertebral body osteotomy, posterior element resection with segment instrumentation and deformity correction, and iliac bone graft reconstruction and fixation via an anterior approach...
February 28, 2018: European Spine Journal
Aaron Dentinger, Michael MacDonald, Douglas Ebert, Kathleen Garcia, Ashot Sargsyan
OBJECTIVE:  The objective is enhanced ophthalmic ultrasound imaging to monitor ocular structure and intracranial dynamics changes related to visual impairment and intracranial pressure (ICP) induced by microgravity. The goals are to improve the ease of use and reduce operator variability by automatically rendering improved views of the anatomy and deriving new metrics of the morphology and dynamics. MATERIALS AND METHODS:  A prototype three-dimensional (3-D) probe was integrated onto a portable ultrasound scanner...
2018: Acta Neurochirurgica. Supplement
Mehmet Murat Uzel, Serdar Ozates, Mustafa Koc, Ayse Guzin Taslipinar Uzel, Pelin Yılmazbaş
PURPOSE: To assess the effect of posterior capsular opacification (PCO) and Neodymium-doped:Yttrium Aluminium Garnet (Nd:YAG) laser capsulotomy on tilt and decentration of intraocular lens (IOL) at vertical and horizontal meridians. METHODS: The study included 64 eyes of 64 patients. IOL decentration and tilt were measured using a Scheimpflug camera before and 1 month after Nd:YAG capsulotomy. Corrected distance visual acuity (CDVA) and manifest refraction were also determined...
February 27, 2018: Seminars in Ophthalmology
Georg Matziolis, Tanja Mueller, Frank Layher, Andreas Wagner
PURPOSE: Although the spacer block technique has been recommended for the implantation of unicompartmental knee arthroplasty (UKA), there is still a lack of data concerning the resulting component positioning. METHODS: This retrospective study included 193 consecutive patients who had undergone medial UKA using the spacer technique. On the basis of the postoperative long standing radiographs, the coronal component alignment was determined in relation to the mechanical axes and the sagittal component alignment in relation to the anatomical axes of the tibia and femur...
February 26, 2018: Archives of Orthopaedic and Trauma Surgery
Tobias Hesper, Sarah D Bixby, Daniel A Maranho, Patricia Miller, Young-Jo Kim, Eduardo N Novais
BACKGROUND: Hip osteoarthritis has been reported in the contralateral hip in patients who had been treated for unilateral slipped capital femoral epiphysis (SCFE) during adolescence. Although this might be related to the presence of a mild deformity, the morphologic features of the contralateral hip in unilateral SCFE remains poorly characterized. QUESTIONS/PURPOSES: Do measurements of (1) femoral head-neck concavity (α angle and femoral head-neck offset), (2) epiphyseal extension into the metaphysis (epiphyseal extension ratio and epiphyseal angle), and (3) posterior tilt of the epiphysis (epiphyseal tilt angle) differ between the contralateral asymptomatic hips of patients treated for unilateral SCFE and hips of an age- and sex-matched control population without a history of hip disease? METHODS: From January 2005 to May 2015, 442 patients underwent surgical treatment for SCFE at our institution...
February 23, 2018: Clinical Orthopaedics and related Research
Molly Hischke, Raoul F Reiser
BACKGROUND: Suspension systems are designed to reduce shock and vibration exposure. An aftermarket rear-wheel suspension system is now available for manual tilt-in-space wheelchairs. OBJECTIVE: To compare quantifiable shock and vibration on a rigid manual tilt-in-space wheelchair to published data on manual wheelchairs and to determine whether aftermarket rear suspension system will significantly decrease shock exposure when traversing common obstacles. DESIGN: Cross-sectional SETTING: Research Laboratory PARTICIPANTS: Ten healthy non-wheelchair users...
February 22, 2018: PM & R: the Journal of Injury, Function, and Rehabilitation
Burak Yilmaz, Ediz Kale, William M Johnston
STATEMENT OF PROBLEM: Computer-aided design and computer-aided manufacturing (CAD-CAM) high-density polymers (HDPs) have recently been marketed for the fabrication of long-term interim implant-supported fixed prostheses. However, information regarding the precision of fit of CAD-CAM HDP implant-supported complete-arch screw-retained prostheses is scarce. PURPOSE: The purpose of this in vitro study was to evaluate the marginal discrepancy of CAD-CAM HDP complete-arch implant-supported screw-retained fixed prosthesis frameworks and compare them with conventional titanium (Ti) and zirconia (Zir) frameworks...
February 21, 2018: Journal of Prosthetic Dentistry
Eugene Kim, Seunghee Lee, Hwa-Jae Jeong, Jai Hyung Park, Se-Jin Park, Jaewook Lee, Woosub Kim, Hee Jin Park, So Yeon Lee, Tsuyoshi Murase, Kazuomi Sugamoto, Sumika Ikemoto
BACKGROUND: The purpose of this study is to analyze the 3-dimensional scapular dyskinesis and the kinematics of a hook plate relative to the acromion after hook-plated acromioclavicular dislocation in vivo. Reported complications of acromioclavicular reduction using a hook plate include subacromial erosion and impingement. However, there are few reports of the 3-dimensional kinematics of the hook and scapula after the aforementioned surgical procedure. METHODS: We studied 15 cases of acromioclavicular dislocation treated with a hook plate and 15 contralateral normal shoulders using computed tomography in the neutral and full forward flexion positions...
February 13, 2018: Journal of Shoulder and Elbow Surgery
Yoshihisa Tanaka, Shinichiro Nakamura, Shinichi Kuriyama, Kohei Nishitani, Hiromu Ito, Moritoshi Furu, Mutsumi Watanabe, Shuichi Matsuda
BACKGROUND: Kinematically aligned total knee arthroplasty is based on the concept to represent the premorbid joint alignment with cruciate-retaining implants, characterized by medial tilt and internal rotation. However, kinematic and kinetic effects of kinematically aligned total knee arthroplasty with posterior-stabilized implants is unknown. The purpose of this study was to examine the effect of medial tilting of the joint line with posterior-stabilized implants. METHODS: A mechanical alignment model, and medial tilt 3° and 5° models were constructed...
February 9, 2018: Clinical Biomechanics
Elaine Cristine L Mateus-Vasconcelos, Luiz Gustavo O Brito, Patricia Driusso, Thaís D Silva, Flávia I Antônio, Cristine H J Ferreira
OBJECTIVE: To evaluate the effect of vaginal palpation, vaginal palpation associated with posterior pelvic tilt, and intravaginal electrical stimulation in facilitating voluntary contraction of the pelvic floor muscles in women. METHODS: A randomized controlled trial in which 132 women with pelvic floor muscles function graded at 0 or 1 using the Modified Oxford Scale were randomized into four groups: vaginal palpation (n=33); vaginal palpation with posterior pelvic tilt (n=33); intravaginal electrical stimulation (n=33) and a control group (n=33) that only received verbal instructions...
February 3, 2018: Brazilian Journal of Physical Therapy
Burak Yilmaz, Faris A Alshahrani, Ediz Kale, William M Johnston
STATEMENT OF PROBLEM: Veneering with porcelain may adversely affect the marginal fit of long-span computer-aided design and computer-aided manufacturing (CAD-CAM) implant-supported fixed prostheses. Moreover, data regarding the precision of fit of CAD-CAM-fabricated implant-supported complete zirconia fixed dental prostheses (FDPs) before and after porcelain layering are limited. PURPOSE: The purpose of this in vitro study was to evaluate the effect of porcelain layering on the marginal fit of CAD-CAM-fabricated complete-arch implant-supported, screw-retained FDPs with presintered zirconia frameworks compared with titanium...
February 6, 2018: Journal of Prosthetic Dentistry
Vibhu K Viswanathan, Sunil Kukreja, Amy J Minnema, H Francis Farhadi
OBJECTIVE Proximal junctional kyphosis (PJK) can progress to proximal junctional failure (PJF), a widely recognized early and serious complication of multisegment spinal instrumentation for the treatment of adult spinal deformity (ASD). Sublaminar band placement has been suggested as a possible technique to prevent PJK and PJF but carries the theoretical possibility of a paradoxical increase in these complications as a result of the required muscle dissection and posterior ligamentous disruption. In this study, the authors prospectively assess the safety as well as the early clinical and radiological outcomes of sublaminar band insertion at the upper instrumented vertebra (UIV) plus 1 level (UIV+1)...
February 9, 2018: Journal of Neurosurgery. Spine
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