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https://www.readbyqxmd.com/read/28642192/applications-of-3d-orbital-computer-assisted-surgery-cas
#1
Paolo Scolozzi
INTRODUCTION: The purpose of the present report is to describe the indications for use of 3D orbital computer-assisted surgery (CAS). PATIENTS AND METHODS: We analyzed the clinical and radiological data of all patients with orbital deformities treated using intra-operative navigation and CAD/CAM techniques at the Hôpitaux Universitaires de Genève, Switzerland, between 2009 and 2016. We recorded age and gender, orbital deformity, technical and surgical procedure and postoperative complications...
June 19, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28612705/treatment-of-acetabular-chondral-lesions-with-microfracture-technique
#2
Claudio Mella, Alvaro Nuñez, Ignacio Villalón
INTRODUCTION: Acetabular cartilage lesions are frequently found during hip arthroscopy. In the hip joint they mostly occur secondary to a mechanical overload resulting from a pre-existing deformity as hip dysplasia or femoroacetabular impingement (FAI). Lesions identified during arthroscopy can vary greatly from the earliest stages to the most advanced (full-thickness lesions). These lesions occur in the acetabulum in the early stages of joint damage. Microfractures are indicated in full-thickness chondral defects...
2017: SICOT-J
https://www.readbyqxmd.com/read/28529661/slipped-capital-femoral-epiphysis-management-and-the-arthroscope
#3
F Accadbled, O May, C Thévenin-Lemoine, J Sales de Gauzy
BACKGROUND: In situ pinning of slipped capital femoral epiphysis (SCFE) results in various degrees of deformity of the femoral head-neck junction. Repetitive trauma from cam-type femoroacetabular impingement (FAI) can lead to labral tears and injury to the articular cartilage causing loss of function. Arthroscopic osteoplasty is an alternative to open procedure and to Southwick/Imhäuser-type osteotomies in symptomatic selected cases. SURGICAL TECHNIQUE: The amount of bone to be resected has to be carefully planned pre-operatively...
April 2017: Journal of Children's Orthopaedics
https://www.readbyqxmd.com/read/28507636/influence-of-number-of-implants-and-attachment-type-on-stress-distribution-in-mandibular-implant-retained-overdentures-finite-element-analysis
#4
Mohamed I El-Anwar, Eman A El-Taftazany, Hamdy A Hamed, Mohamed A Abd ElHay
AIM: This study aimed to compare the stresses generated by using two or four root form dental implants supporting mandibular overdentures that were retained with ball and locator attachments. METHODS: Under ANSYS environment, four 3D finite element models were prepared. These models simulated complete overdentures supported by two or four implants with either ball or locator attachments as a connection mechanism. The models' components were created by CAD/CAM package then were imported to ANSYS...
April 15, 2017: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/28504915/prevalence-of-os-styloideum-in-national-hockey-league-players
#5
Harry G Greditzer, Ian D Hutchinson, Christian S Geannette, Robert N Hotchkiss, Bryan T Kelly, Hollis G Potter
BACKGROUND: Os styloideum describes an accessory carpal ossicle between the trapezoid, the capitate, and the second and third metacarpals. Injuries to this tissue have been described as part of the carpal boss syndrome. While the etiology of os styloideum remains uncertain, it may represent a physiologic response to altered loading forces in the wrist, similar to the development of cam-type deformity in the hips of ice hockey players or the Bennett lesion in the shoulders of baseball pitchers...
May 1, 2017: Sports Health
https://www.readbyqxmd.com/read/28437496/novel-solution-for-massive-glenoid-defects-in-shoulder-arthroplasty-a-patient-specific-glenoid-vault-reconstruction-system
#6
David M Dines, Lawrence Gulotta, Edward V Craig, Joshua S Dines
Complex glenoid deformities present the most difficult challenges in shoulder arthroplasty. These deformities may be caused by severe degenerative or congenital deformity, posttraumatic anatomy, tumor, or, in most cases, bone loss after glenoid failure in anatomical total shoulder arthroplasty. Methods of treating severe bone loss have included inlay and onlay bone-graft options with augmented fixation and, in severe cases, salvage hemiarthroplasty with limited goal expectations. Unfortunately, none of these methods has provided consistently satisfactory reproducible results...
March 2017: American Journal of Orthopedics
https://www.readbyqxmd.com/read/28381373/the-use-of-patient-specific-implants-in-orthognathic-surgery-a-series-of-30-mandible-sagittal-split-osteotomy-patients
#7
Juho Suojanen, Junnu Leikola, Patricia Stoor
PURPOSE: Virtual surgery combined with patient-specific saw and drill guides and osteosynthesis materials are rapidly spreading from reconstructive surgery to orthognathic surgery. Most commercial partners are already providing computer-aided design and computer-aided manufacture (CAD/CAM) wafers and patient-specific saw guides. Clear benefits have been demonstrated for custom-made drill guides combined with individually designed three-dimensional (3D) printed patient-specific implants (PSI) as a reposition and fixation system in Le Fort I osteotomy...
March 3, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28363893/osseous-impingement-occurs-early-in-flexion-in-cam-type-femoroacetabular-impingement-a-4d-ct-model
#8
S Fernquest, C Arnold, A Palmer, J Broomfield, J Denton, A Taylor, S Glyn-Jones
AIMS: The aim of this study was to examine the real time in vivo kinematics of the hip in patients with cam-type femoroacetabular impingement (FAI). PATIENTS AND METHODS: A total of 50 patients (83 hips) underwent 4D dynamic CT scanning of the hip, producing real time osseous models of the pelvis and femur being moved through flexion, adduction, and internal rotation. The location and size of the cam deformity and its relationship to the angle of flexion of the hip and pelvic tilt, and the position of impingement were recorded...
April 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28337986/simultaneous-treatment-of-temporomandibular-joint-ankylosis-with-severe-mandibular-deficiency-by-standard-tmj-prosthesis
#9
YiHui Hu, LuZhu Zhang, DongMei He, Chi Yang, MinJie Chen, ShanYong Zhang, Hui Li, Edward Ellis Iii
Temporomandibular joint (TMJ) ankylosis is a refractory disease that is difficult to predictably treat. This study evaluated the prognosis of using standard alloplastic TMJ prostheses for the treatment of TMJ ankylosis in Chinese patients with severe mandibular deficiency. Patients treated from 2013 to 2015 were reviewed. The computer-aided design and manufacture (CAD/CAM) technique was used to guide bony mass removal and locate the TMJ prosthesis (Biomet, USA). Eleven patients were included in this study. All prostheses were successfully installed and stabilized intraoperatively...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28334547/origin-of-cam-morphology-in-femoroacetabular-impingement
#10
William Z Morris, Ryan T Li, Raymond W Liu, Michael J Salata, James E Voos
Cam morphology of the proximal femur is an abnormal contour of the femoral head-neck junction present in approximately 15% to 25% of the asymptomatic population, predominantly in males. Alpha angle and femoral head-neck offset ratio are 2 objective measurement tools that define cam morphology. Both primary (idiopathic) and secondary cam deformity develops through distinct mechanisms. The cause of primary (idiopathic) cam morphology remains incompletely understood. Mounting evidence suggests that idiopathic cam morphology develops during adolescence through alterations in the capital femoral epiphysis in response to participation in vigorous sporting activity...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28326214/open-and-arthroscopic-with-mini-open-surgical-hip-approaches-for-treatment-of-pigmented-villonodular-synovitis-and-concomitant-hip-pathology
#11
Bridget Ellsworth, Atul F Kamath
Background. Pigmented villonodular synovitis (PVNS) is a rare benign tumor affecting large joints and prompts excision to prevent local destruction of the joint. The purpose of this case report is to describe two differing surgical approaches for management of PVNS of the hip in patients requiring concomitant treatment for additional hip pathology. Methods. This report discusses the presentation, clinical and radiographic findings, and operative management of two contrasting cases of PVNS of the hip. Case 1 describes a 31-year-old female with localized PVNS in addition to a labral tear treated with arthroscopic labral repair followed by tumor excision via a mini-open incision...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/28288077/comparison-of-surgical-outcomes-between-a-triplane-proximal-femoral-osteotomy-and-the-modified-dunn-procedure-for-stable-moderate-to-severe-slipped-capital-femoral-epiphysis
#12
Jakub Sikora-Klak, James D Bomar, Christina N Paik, Dennis R Wenger, Vidyadhar Upasani
BACKGROUND: Recent studies have demonstrated the intra-articular cartilage and labral damage that can occur from the proximal femoral cam-like deformity of a moderate to severe slipped capital femoral epiphysis (SCFE). The approach to treating this deformity in a symptomatic Loder stable hip is controversial. The purpose of this study was to compare radiographic outcomes, complication rates, and revision rates between Imhauser type triplane proximal femoral osteotomy (TPFO) and the modified Dunn procedure (MDP)...
March 10, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28259463/properties-of-the-cartilage-layer-from-the-cam-type-hip-impingement-deformity
#13
Andrew D Speirs, Paul E Beaulé, Adrian Huang, Hanspeter Frei
Femoro-acetabular impingement (FAI) is associated with significant acetabular cartilage damage and degenerative arthritis. To understand the contact stress and thus biomechanical mechanisms that may contribute to degeneration, the material behaviour of the cartilage layer is required. The objective of this study is to determine the fibril-reinforced poroelastic properties and composition of cartilage from cam deformities and to compare to those of normal cartilage. Patients undergoing surgical treatment of a symptomatic cam FAI deformity were recruited from the clinical practice of one of the authors...
April 11, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28244926/biomechanical-evaluation-of-the-depth-of-resection-during-femoral-neck-osteoplasty-for-anterior-impingement-following-slipped-capital-femoral-epiphysis
#14
Kevin M Dale, Geoffrey T Burns, Ying Li
BACKGROUND: Femoroacetabular impingement as a result of slipped capital femoral epiphysis (SCFE) has been treated traditionally with a proximal femoral osteotomy, but open and arthroscopic femoral osteoplasty is becoming increasingly popular. Cam lesions result from excess bone primarily at the anterolateral femoral head-neck junction. SCFEs result from posterior and inferior slippage of the femoral epiphysis, causing the metaphysis to move anteriorly. This study's purpose was to compare fourth-generation sawbones standard femurs with SCFE femurs to determine whether bone resection from the anterior metaphysis results in similar biomechanical properties...
February 27, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28176673/surgical-hip-dislocation-in-treatment-of-slipped-capital-femoral-epiphysis
#15
Mohammed Elmarghany, Tarek M Abd El-Ghaffar, Mahmoud Seddik, Ahmed Akar, Yousef Gad, Eissa Ragheb, Alessandro Aprato, Alessandro Massè
BACKGROUND: Most surgeons advocate in situ fixation of the slipped epiphysis with acceptance of any persistent deformity in the proximal femur [Aronsson DD, Loder RT, Breur GJ, Weinstein SL (2006) Slipped capital femoral epiphysis: current concepts. J Am Acad Orthop Surg 14, 666-679]. This residual deformity can lead to osteoarthritis due to femoroacetabular cam impingement (FAI) [Leunig M, Slongo T, Ganz R (2008) Subcapital realignment in slipped capital femoral epiphysis: surgical hip dislocation and trimming of the stable trochanter to protect the perfusion of the epiphysis...
2017: SICOT-J
https://www.readbyqxmd.com/read/28165605/rotational-alignment-of-the-knee-is-different-in-osteological-specimens-with-and-without-a-large-cam-deformity-of-the-proximal-femur
#16
Jeremy J Gebhart, Jonathan J Streit, Avi Goodman, Jordan Etscheidt, Douglas S Weinberg, Asheesh Bedi, Shane J Nho, Michael J Salata
PURPOSE: We studied a large osteological collection for differences in knee rotation based upon the presence or absence of a large cam deformity of the proximal femur. METHODS: We obtained 357 matched tibiae and femora from the Hamann-Todd Osteological Collection and measured: femoral head-neck alpha angle, anteroposterior axis (or Whiteside's line) at the distal femur relative to the posterior condylar axis, and position of the tibial tubercle with respect to the posterior condylar axis of the proximal tibia...
February 2, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/28149715/remplissage-of-the-femoral-head-neck-junction-in-revision-hip-arthroscopy-a-technique-to-correct-excessive-cam-resection
#17
Jonathan M Frank, Jorge Chahla, Justin J Mitchell, Eduardo Soares, Marc J Philippon
Femoroacetabular impingement (FAI) is an increasingly recognized cause of hip pain. This pathology often involves abnormal femoral neck shape (cam-type FAI), acetabular over coverage (pincer-type FAI), or mixed pathology. Surgical treatment of this entity includes labral repair and femoral head-neck osteochondroplasty. A mindful arthroscopic technique is of paramount importance, because maintaining the integrity of the labrum and a corresponding neck volume has been reported to be vital in maintaining the hip suction seal...
December 2016: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28118503/cad-cam-assisted-auricular-prosthesis-fabrication-for-a-quick-precise-and-more-retentive-outcome-a-clinical-report
#18
Sushma Yadav, Aparna Ichangod Narayan, Archit Choudhry, Dhanasekar Balakrishnan
Auricular defects comprise a large proportion of maxillofacial deformities. Most patients with acquired deformities have psychosocial ineptness and seek cosmetic rehabilitation. Although minor defects can be corrected surgically, extensive deformities are difficult to reconstruct with plastic surgery. Contrary to that, prosthetic restoration can provide excellent esthetic results. The conventional methods of maxillofacial prosthesis fabrication are time consuming and the outcome depends on the technician's skill...
January 24, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28112875/three-dimensional-assessment-of-impingement-risk-in-geometrically-parameterised-hips-compared-with-clinical-measures
#19
Robert J Cooper, Marlène Mengoni, Dawn Groves, Sophie Williams, Marcus J K Bankes, Philip Robinson, Alison C Jones
Abnormal bony morphology is a factor implicated in hip joint soft tissue damage and an increased lifetime risk of osteoarthritis. Standard 2-dimensional radiographic measurements for diagnosis of hip deformities, such as cam deformities on the femoral neck, do not capture the full joint geometry and are not indicative of symptomatic damage. In this study, a 3-dimensional geometric parameterisation system was developed to capture key variations in the femur and acetabulum of subjects with clinically diagnosed cam deformity...
January 23, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28111694/progressive-femoroacetabular-impingement-after-complete-excision-of-osteoid-osteoma-in-adolescents-a-report-of-two-cases
#20
Woo Young Jang, Soon Hyuck Lee, Il Youp Cho
This article highlights that the long-term and serial follow-up of adolescents with osteoid osteoma should be considered, even after complete excision of the nidus owing to the possibility of the delayed onset or progression of femur head and neck deformities or osteoarthritis. It is important to recognize the sequelae of osteoid osteomas, such as bone edema and new bone formation, which can alter the normal anatomy of the proximal femur. We report two cases of osteoid osteoma in the proximal femur, which showed progressive hypertrophy of the femoral neck after excision of the nidus and subsequent cam-type femoroacetabular impingement (FAI), requiring additional osteochondroplasty procedures...
January 22, 2017: Skeletal Radiology
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