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Cam deformity

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
Tomohiro Mimura, Kanji Mori, Shin Itakura, Yuki Furuya, Taku Kawasaki, Shinji Imai
BACKGROUND: Femoroacetabular impingement (FAI) is thought to be associated with hip osteoarthritis. We investigated the prevalences of radiologic deformities of the pincer, cam, and their combinations in Japanese hip joints using computed tomography (CT) according to the Japanese Hip Society diagnostic guideline for FAI. METHODS: Multi-slice CT images were evaluated. Pincer deformities were defined as: type 1: center-edge angle (CE) ≥40°; type 2: CE ≥ 30° and acetabular roof obliquity ≤0°; type 3: CE ≥ 25° and retroverted acetabulum...
October 6, 2016: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
Fatemeh Saberi Hosnijeh, Maria E Zuiderwijk, Mathijs Versteeg, Hieronymus T W Smeele, Albert Hofman, André G Uitterlinden, Rintje Agricola, Edwin H G Oei, Jan H Waarsing, Sita M Bierma-Zeinstra, Joyce B J van Meurs
Objectives Cam deformity and acetabular dysplasia have been recognized as relevant risk factors for hip osteoarthritis (OA) in a few prospective studies with limited sample sizes. However, to date, there is no evidence available from prospective studies if the magnitude of these associations differ by gender, body mass index (BMI), and age. Methods Participants of Rotterdam Study cohort including men and women aged 55 years or older without OA at baseline (n=4438) and mean follow-up of 9.2 years were included in the study...
October 1, 2016: Arthritis & Rheumatology
Nuno Calha, Ana Messias, Fernando Guerra, Beatriz Martinho, Maria Augusta Neto, Pedro Nicolau
PURPOSE: To evaluate the effect of geometry on the displacement and the strain distribution of anterior implant-supported zirconia frameworks under static load using the 3D digital image correlation method. METHODS: Two groups (n=5) of 4-unit zirconia frameworks were produced by CAD/CAM for the implant-abutment assembly. Group 1 comprised five straight configuration frameworks and group 2 consisted of five curved configuration frameworks. Specimens were cemented and submitted to static load up to 200N...
September 22, 2016: Journal of Prosthodontic Research
Young-Jo Kim
No abstract text is available yet for this article.
September 16, 2016: Arthritis & Rheumatology
Jens Goronzy, Lea Franken, Albrecht Hartmann, Falk Thielemann, Anne Postler, Tobias Paulus, Klaus-Peter Günther
BACKGROUND: Periacetabular osteotomy (PAO) is a reliable procedure to correct the deficient acetabular coverage in hips with developmental dysplasia. It is unclear how the presence of additional femoral cam-type deformity might influence the clinical and radiographic treatment results of PAO. QUESTIONS/PURPOSES: (1) Are there differences in clinical scores (WOMAC, EQ-5D) and examination findings (impingement sign) or radiographic measures of acetabular orientation and head sphericity after PAO for isolated acetabular dysplasia when compared with the combined pathology of dysplasia and additional femoral cam deformity? (2) Are these clinical and radiographic findings after combined surgical therapy for additional cam deformity influenced by different pathology-adjusted surgical techniques? METHODS: From July 2005 to December 2010, 86 patients (106 hips) underwent PAO for hip dysplasia...
September 2, 2016: Clinical Orthopaedics and related Research
K Mineta, T Goto, K Wada, Y Tamaki, D Hamada, I Tonogai, K Higashino, K Sairyo
AIMS: Femoroacetabular impingement (FAI) has been highlighted and well documented primarily in Western countries and there are few large studies focused on FAI-related morphological assessment in Asian patients. We chose to investigate this subject. PATIENTS AND METHODS: We assessed the morphology of the hip and the prevalence of radiographic FAI in Japanese patients by measuring predictors of FAI. We reviewed a total of 1178 hips in 695 men and 483 women with a mean age of 58...
September 2016: Bone & Joint Journal
S Seriani, G Del Favero, J Mahaffey, D Marko, P Gallina, C S Long, L Mestroni, O Sbaizero
Mechanical stimulation appears to be a critical modulator for many aspects of biology, both of living tissue and cells. The cell-stretcher, a novel device for the mechanical uniaxial stimulation of populations of cells, is described. The system is based on a variable stroke cam-lever-tappet mechanism which allows the delivery of cyclic stimuli with frequencies of up to 10 Hz and deformation between 1% and 20%. The kinematics is presented and a simulation of the dynamics of the system is shown, in order to compute the contact forces in the mechanism...
August 2016: Review of Scientific Instruments
K C Geoffrey Ng, Giulia Mantovani, Mario Lamontagne, Michel R Labrosse, Paul E Beaulé
BACKGROUND: It is still unclear why many individuals with a cam morphology of the hip do not experience pain. It was recently reported that a decreased femoral neck-shaft angle may also be associated with hip symptoms. However, the effects that different femoral neck-shaft angles have on hip stresses in symptomatic and asymptomatic individuals with cam morphology remain unclear. QUESTIONS/PURPOSES: We examined the effects of the cam morphology and femoral neck-shaft angle on hip stresses during walking by asking: (1) Are there differences in hip stress characteristics among symptomatic patients with cam morphology, asymptomatic individuals with cam morphology, and individuals without cam morphology? (2) What are the effects of high and low femoral neck-shaft angles on hip stresses? METHODS: Six participants were selected, from a larger cohort, and their cam morphology and femoral neck-shaft angle parameters were measured from CT data...
August 31, 2016: Clinical Orthopaedics and related Research
Vasco V Mascarenhas, Paulo Rego, Pedro Dantas, Augusto Gaspar, Francisco Soldado, José G Consciência
OBJECTIVE: Our objectives were to use 3D computed tomography (CT) to define head-neck morphologic gender-specific and normative parameters in asymptomatic individuals and use the omega angle (Ω°) to provide quantification data on the location and radial extension of a cam deformity. METHODS: We prospectively included 350 individuals and evaluated 188 asymptomatic hips that underwent semiautomated CT analysis. Different thresholds of alpha angle (α°) were considered in order to analyze cam morphology and determine Ω°...
August 30, 2016: European Radiology
Perry Hooper, Sameer Oak, T Sean Lynch, Gehan Ibrahim, Ryan Goodwin, James Rosneck
PURPOSE: To compare the hip morphology of adolescent male patients and female patients who underwent hip arthroscopy for femoroacetabular impingement (FAI) and determine if gender differences exist. METHODS: We retrospectively reviewed the records of 177 adolescents, aged 13 to 18 years, who were treated for FAI with hip arthroscopy. We examined and analyzed preoperative magnetic resonance imaging (MRI) scans and plain radiographs, measuring the lateral center-edge angle, Tönnis angle, and alpha angle...
August 8, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
Helen Anwander, Kawan S Rakhra, Gerd Melkus, Paul E Beaulé
BACKGROUND: T1ρ MRI has been shown feasible to detect the biochemical status of hip cartilage, but various region-of-interest strategies have been used, compromising the reproducibility and comparability between different institutions and studies. QUESTIONS/PURPOSES: The purposes of this study were (1) to determine representative regions of interest (ROIs) for cartilage T1ρ mapping in hips with a cam deformity; and (2) to assess intra- and interobserver reliability for cartilage T1ρ mapping in hips with a cam deformity...
August 9, 2016: Clinical Orthopaedics and related Research
Thomas L Sanders, Patrick Reardon, Bruce A Levy, Aaron J Krych
PURPOSE: Few studies have evaluated the role of hip arthroscopy in patients with coxa profunda. The purposes of this study are to (1) report functional hip outcomes after arthroscopic treatment of patients with femoroacetabular impingement (FAI) associated with radiographic coxa profunda and (2) evaluate factors associated with poor hip function at minimum 2 years following surgery in this specific cohort. METHODS: This retrospective review included patients with radiographic sign of coxa profunda who underwent hip arthroscopy to treat FAI...
August 9, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Andrea B Mosler, Kay M Crossley, Jan H Waarsing, Nabil Jomaah, Adam Weir, Per Hölmich, Rintje Agricola
BACKGROUND: Participation in high-impact athletic activities has recently been associated with a higher prevalence of cam deformity. Bony hip morphology has also emerged as an important factor in the development of hip osteoarthritis. However, it is unknown whether bony morphology differs between ethnicities in athletes participating in high-impact sports. PURPOSE: To investigate whether the prevalence of specific bony hip morphological abnormalities differed between professional male soccer players of diverse ethnic backgrounds...
August 4, 2016: American Journal of Sports Medicine
Darrin J Trask, James S Keene
BACKGROUND: Data on the efficacy of microfracture for treatment of chondral defects in the hip are currently limited, and the recommended criteria for its use (minimal osteoarthritis; a focal, contained lesion <4 cm(2) in size) have been taken from those that were established for the knee. PURPOSE: To determine if the current microfracture (ie, knee) criteria are appropriate for chondral lesions in the hip. STUDY DESIGN: Case series; Level of evidence, 4...
July 27, 2016: American Journal of Sports Medicine
Aretusa Lopes Cavalheiro, Debora Tacon da Costa, Ana Luiza Ferro de Menezes, Janser Moura Pereira, Eliane Maria de Carvalho
BACKGROUND: Low temperatures and slow blood flow may result from peripheral neuropathy caused by leprosy, and the simple detection of cold fingers could already be a preliminary classification for these patients. OBJECTIVE: To investigate whether infrared thermography would be able to measure this change in temperature in the hands of people with leprosy. METHOD: The study assessed 17 leprosy patients who were under treatment at the National Reference Center for Sanitary Dermatology and Leprosy, Uberlândia/MG, and 15 people without leprosy for the control group...
May 2016: Anais Brasileiros de Dermatologia
Cara Beth Lee, Hillard T Spencer, Kirsten F Nygaard
BACKGROUND: Cam deformity is associated with epiphyseal extension onto the anterosuperior femoral head-neck before physeal closure. A century ago, anatomists speculated that this femoral prominence acts as a pulley bar to withstand capsular compression in hip extension with pressure concentrated where the zona orbicularis (ZO) joins the iliofemoral ligament (IFL). An animal model has shown that growth plates deflect laterally and distally when exposed to forces perpendicular to growth...
December 2016: Journal of Orthopaedics
Songshan Zeng, Dianyun Zhang, Wenhan Huang, Zhaofeng Wang, Stephan G Freire, Xiaoyuan Yu, Andrew T Smith, Emily Y Huang, Helen Nguon, Luyi Sun
A number of marine organisms use muscle-controlled surface structures to achieve rapid changes in colour and transparency with outstanding reversibility. Inspired by these display tactics, we develop analogous deformation-controlled surface-engineering approaches via strain-dependent cracks and folds to realize the following four mechanochromic devices: (1) transparency change mechanochromism (TCM), (2) luminescent mechanochromism (LM), (3) colour alteration mechanochromism (CAM) and (4) encryption mechanochromism (EM)...
2016: Nature Communications
Brian C Werner, Michael A Gaudiani, Anil S Ranawat
Cam-type deformity of the proximal femur is a relative increase in the discrepancy of the femoral head-neck offset. The etiology is unknown; several conditions have been implicated in the development of abnormal proximal femoral anatomy. Recent evidence suggests that high-impact sports place stress on the immature physis during growth and may play an important role. Imaging is essential in the initial diagnostic workup, characterization of pathology, preoperative planning, and intraoperative decision making...
July 2016: Clinics in Sports Medicine
Stephanie W Mayer, João Caetano Munhoz Abdo, Mary K Hill, Lauryn A Kestel, Zhaoxing Pan, Eduardo N Novais
BACKGROUND: Femoroacetabular impingement (FAI) deformity has been associated with posterior hip instability in adult athletes. PURPOSE: To determine if FAI deformity is associated with posterior hip instability in adolescents, the femoral head-neck junction or acetabular structure in a cohort of adolescent patients who sustained a low-energy, sports-related posterior hip dislocation was compared with that in a group of healthy age- and sex-matched controls with no history of hip injury or pain...
September 2016: American Journal of Sports Medicine
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