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https://www.readbyqxmd.com/read/28924748/a-multi-joint-model-of-quiet-upright-stance-accounts-for-the-uncontrolled-manifold-structure-of-joint-variance
#1
Hendrik Reimann, Gregor Schöner
The upright body in quiet stance is usually modeled as a single-link inverted pendulum. This agrees with most of the relevant sensory organs being at the far end of the pendulum, i.e., the eyes and the vestibular system in the head. Movement of the body in quiet stance has often been explained in terms of the "ankle strategy," where most movement is generated by the ankle musculature, while more proximal muscle groups are only rarely activated for faster movements or in response to perturbations, for instance, by flexing at the hips in what has been called the "hip strategy...
September 18, 2017: Biological Cybernetics
https://www.readbyqxmd.com/read/28924359/brazilian-orthopedists-opinions-and-perceptions-on-femoroacetabular-impingement
#2
Leandro Ejnisman, Moin Khan, Olufemi Rolland Ayeni, Mohit Bhandari, Helder de Souza Miyahara, Jose Ricardo Negreiros Vicente
OBJECTIVE: To assess the opinion of Brazilian orthopedists surgeons on the diagnosis and treatment of femoroacetabular impingement (FAI). METHODS: A questionnaire was sent to several orthopedic societies around the world, including the Sociedade Brasileira de Ortopedia e Traumatologia (SBOT). This questionnaire was sent electronically and included questions on many topics related to FAI. RESULTS: 253 Brazilian orthopedists responded the questionnaire...
November 2016: Acta Ortopedica Brasileira
https://www.readbyqxmd.com/read/28922049/magnitudes-of-muscle-activation-of-spine-stabilizers-in-healthy-adults-during-prone-on-elbow-planking-exercises-with-and-without-a-fitness-ball
#3
James W Youdas, Kendra C Coleman, Erin E Holstad, Stephanie D Long, Nicole L Veldkamp, John H Hollman
Prone planking exercises have been used by rehabilitation professionals to activate torso muscles in healthy persons and those with low back pain. The aim of this study was to compare the magnitude of electromyographic (EMG) muscle activation from 10 right-sided muscles as demonstrated by the percentage of maximum voluntary isometric contraction (%MVIC) during four planking procedures. Surface EMG activity was acquired from the following muscles: (1) iliocostalis lumborum (IL), (2) longissimus thoracis (LT), (3) lumbar multifidus (LM), (4) rectus abdominis (RA), (5) external oblique (EO), (6) internal oblique (IO), (7) serratus anterior (SA), (8) latissimus dorsi (LD), (9) hamstrings (HS), and (10) gluteus maximus (GM)...
September 18, 2017: Physiotherapy Theory and Practice
https://www.readbyqxmd.com/read/28918517/detecting-cam-type-deformities-on-plain-radiographs-what-is-the-optimal-lateral-view
#4
Christian Hipfl, Markus Titz, Catharina Chiari, Veronika Schöpf, Franz Kainberger, Reinhard Windhager, Stephan Domayer
PURPOSE: Radial magnetic resonance imaging (MRI) is the most accurate diagnostic tool in assessing cam-type femoroacetabular impingement. Plain radiographs, however, are useful for the initial diagnosis in the daily practice and there is still debate regarding the optimal lateral view. The purpose of this study was to investigate the reliability of detecting cam deformities using the frog-leg view or the 45° Dunn view by comparison with radial MRI. MATERIAL: 66 consecutive hips with plain radiographs (36 with AP and frog-leg views, 30 with AP and 45° Dunn views) and radial MRI were assessed...
September 16, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28917617/change-in-acetabular-cup-orientation-from-supine-to-standing-position-and-its-effect-on-wear-of-highly-crosslinked-polyethylene
#5
Matthew G Teeter, Prateek Goyal, Xunhua Yuan, James L Howard, Brent A Lanting
BACKGROUND: The purpose of this study is to measure acetabular cup position and wear of the highly crosslinked polyethylene liner in the supine and standing position for patients at a minimum of 10 years after the operation. METHODS: A total of 38 patients were recruited at a mean of 12.5 years after the operation. All patients received a single acetabular cup design with a highly crosslinked liner and a 28-mm cobalt-chromium femoral head. Patients underwent supine and standing radiostereometric examinations in which the X-ray sources and detectors were positioned to obtain an anterior-posterior and cross-table lateral radiograph...
August 31, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28917519/endoscopic-or-arthroscopic-iliopsoas-tenotomy-for-iliopsoas-impingement-followingtotal-hip-replacement-a-prospective-multicenter-64-case-series
#6
W Guicherd, N Bonin, T Gicquel, J E Gedouin, X Flecher, M Wettstein, M Thaunat, N Prevost, E Ollier, O May
INTRODUCTION: Impingement between the acetabular component and the iliopsoas tendon is a cause of anterior pain after total hip replacement (THR). Treatment can be non-operative, endoscopic or arthroscopic, or by open revision of the acetabular component. Few studies have assessed these options. The present study hypothesis was that endo/arthroscopic treatment provides rapid pain relief with a low rate of complications. METHODS: A prospective multicenter study included 64 endoscopic or arthroscopic tenotomies for impingement between the acetabular component and the iliopsoas tendon, performed in 8 centers...
September 13, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28912634/posterior-hip-instability-relocation-testing-a-resident-s-case-report
#7
Rich Maas, Scott Wallentine, Dale Gerke, Sam Crager, Jessica Stewart
BACKGROUND: Micro-instability (non-radiographic clinical instability) continues to gain recognition as a problem at the hip. Although most research has been directed to anterior hip instability, posterior hip instability (PHI) has also garnered attention. PHI is under recognized, difficult to identify, and confused with other hip pathologies such as a simple sprain or strain. A novel clinical test is introduced that may have helped identify PHI in this patient. Additionally, a conservative rehabilitation approach emphasizing stabilization exercises is described...
September 2017: Journal of Manual & Manipulative Therapy
https://www.readbyqxmd.com/read/28893388/the-imaging-findings-of-impingement-syndromes-of-the-lower-limb
#8
REVIEW
M De Maeseneer, S Wuertzer, J de Mey, M Shahabpour
In this article we provide an overview of impingement syndromes of the lower limb. At the level of the hip, femoroacetabular and ischiofemoral impingement are recognised. At the level of the knee, we discuss Hoffa's fat pad impingement, suprapatellar fat pad impingement, pericruciate impingement, and iliotibial band syndrome. The impingement syndromes associated with anterior cruciate ligament (ACL) repair and intercondylar osteophytes are also illustrated. Most impingement syndromes are described at the level of the ankle...
September 8, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28892671/kinematic-and-kinetic-gait-deviations-in-males-long-after-anterior-cruciate-ligament-reconstruction
#9
Giovanni Milandri, Mike Posthumus, T J Small, Adam Bothma, Willem van der Merwe, Reshma Kassanjee, Sudesh Sivarasu
BACKGROUND: Biomechanical deviations long (approx. 5years) after anterior cruciate ligament reconstruction have not been quantified in males, despite their distinct risk profile as compared to females. These deviations can indicate altered joint loading during chronic, repetitive motions. METHODS: Cross-sectional study, comparing kinematic and kinetic variables between 15 male anterior cruciate ligament reconstructed patients and 15 healthy controls. During walking and running gait, measurements were taken of impact dynamics, knee and hip sagittal plane angles and moments, and knee varus angles and adduction moments...
July 29, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28888740/can-the-hip-joint-center-be-estimated-from-pelvic-dimensions-in-dysplastic-hips
#10
Masanori Fujii, Tetsuro Nakamura, Toshihiko Hara, Yasuharu Nakashima
BACKGROUND: We aimed to determine correlations between the hip joint center position and pelvic dimensions and whether the three-dimensional position of the original hip joint center could be estimated from pelvic landmarks in dysplastic and normal hips. METHODS: We reviewed the pelvic CT scans of 70 patients (70 hips) with hip dysplasia. Seventy-seven normal hips were used as controls. The hip joint center coordinates (Cx, Cy, and Cz) and pelvic dimensions were measured with reference to the anterior pelvic plane coordinate system...
September 6, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28886823/update-on-anterior-cruciate-ligament-rupture-and-care-in-the-female-athlete
#11
REVIEW
Jeremy M Burnham, Vonda Wright
As female athlete sports participation has continued to increase, the rate of anterior cruciate ligament (ACL) rupture in female athletes has also increased. Individualized, patient-specific treatment is crucial to achieving optimal outcomes; ACL reconstruction must accurately restore native ACL anatomy and address any concomitant injury to secondary stabilizers. Rehabilitation programs should target hip, core, and trunk neuromuscular control; allow adequate time for graft ligamentization; and address the psychosocial needs of the athlete...
October 2017: Clinics in Sports Medicine
https://www.readbyqxmd.com/read/28885648/improving-registration-accuracy-during-total-hip-arthroplasty-a-cadaver-study-of-a-new-3-d-mini-optical-navigation-system
#12
Michael B Cross, Ran Schwarzkopf, Theodore T Miller, Eric A Bogner, Jeffrey M Muir, Jonathan M Vigdorchik
INTRODUCTION: Maintaining accuracy of component placement is an important step in ensuring the long-term stability of components during total hip arthroplasty (THA). Computer-assisted navigation has improved accuracy but errors associated with the registration process are known to impact the accuracy of final measurements. The purpose of this cadaver study was to determine the registration error associated with a novel mini-navigation system. METHODS: 3 board-certified orthopaedic surgeons performed 4 THA procedures each via the posterolateral approach on 6 cadavers (12 hips) using the mini-navigation tool...
September 2, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/28878531/neglected-acetabular-fracture-fix-or-replace
#13
Ismail Hadisoebroto Dilogo, Jephtah Furano Lumban Tobing
INTRODUCTION: Operative treatment of acute acetabular fractures has shown better results than the non-operative approach. There is, however, limited data regarding the operative treatment of neglected acetabular fracture. METHODS: We present six subjects with neglected fracture of the acetabulum in Cipto Mangunkusumo National Hospital, Jakarta, Indonesia. One had only open reduction and internal fixation, three had open reduction and internal fixation first before we performed arthroplasty later, one had both open reduction and internal fixation with arthroplasty, and another had immediate arthroplasty...
August 2017: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/28878454/effects-of-pelvic-compression-belts-on-the-kinematics-and-kinetics-of-the-lower-extremities-during-sit-to-stand-maneuvers
#14
Jong Moon Kim, Hyun Dong Je, Hyeong-Dong Kim
[Purpose] To investigate the effects of a pelvic compression belt (PCB) and chair height on the kinematics and kinetics of the lower extremity during sit-to-stand (STS) maneuvers in healthy people. [Subjects and Methods] Twenty-two people participated in this study. They were required to perform STS maneuvers under four conditions. Hip joint moment and angular displacement of the hip, knee, and ankle were measured. A PCB was also applied below the anterior superior iliac spine. [Results] The angular displacement of the ankle joint increased while performing STS maneuvers from a normal chair with a PCB in phase 1, and decreased during phase 2 when performing STS maneuvers from a high chair...
August 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28877576/unusual-location-of-hydatid-cysts-report-of-two-cases-in-the-heart-and-hip-joint-of-romanian-patients
#15
Simona Gurzu, Marius Alexandru Beleaua, Emeric Egyed-Zsigmond, Ioan Jung
Hydatid cyst is usually located in the liver and lungs, rare cases showing localization in other organs or tissues. In the unusual location, echinococcosis is an excluding diagnosis that is established only after microscopic evaluation. Our first case occurred in a 67-year-old female previously diagnosed with pulmonary tuberculosis and hospitalized with persistent pain in the hip joint. The clinical diagnosis was tuberculosis of the joint, but the presence of the specific acellular membrane indicated a hydatid cyst of the synovial membrane, without bone involvement...
August 2017: Korean Journal of Parasitology
https://www.readbyqxmd.com/read/28872534/morphological-analysis-of-true-acetabulum-in-hip-dysplasia-crowe-classes-i-iv-via-3-d-implantation-simulation
#16
Yuhui Yang, Jianlin Zuo, Tong Liu, Jianlin Xiao, Shuanglu Liu, Zhongli Gao
BACKGROUND: The purpose of this study was to investigate the 3-dimensional (3D) morphological features of the true acetabulum in patients with developmental dysplasia of the hip (DDH). METHODS: Seventy-nine hips-53 in patients with developmental dysplasia of the hip (DDH) and 36 normal hips-were included in the present study. According to the Crowe classification, 26 hips were graded as Class I, 31 were Class II or III, and 22 were Class IV. The anterior pelvic plane was defined to standardize the measurements in the study...
September 6, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28869116/teriparatide-administration-increases-periprosthetic-bone-mineral-density-after-total-knee-arthroplasty-a-prospective-study
#17
Tatsuya Suzuki, Fumio Sukezaki, Takashi Shibuki, Yoichi Toyoshima, Takashi Nagai, Katsunori Inagaki
BACKGROUND: Teriparatide is a currently available therapeutic agent for osteoporosis. Previous studies have reported that teriparatide affects periprosthetic bone mineral density (BMD) after total knee arthroplasty (TKA). However, little agreement has been reached concerning the treatment of periprosthetic BMD after TKA with teriparatide. Moreover, BMD in the femoral and tibial sides of the joints together has never been examined. We investigated the efficacy of teriparatide to inhibit BMD loss in the femoral and tibial side and considered complications such as migration and periprosthetic fractures after TKA...
July 25, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28869014/-iliac-haematoma-as-a-differential-diagnosis-to-lumbar-disc-herniation
#18
Esben Stistrup Lauritzen, Klaus Kjær Petersen
After a fall without fracture an 83-year-old man who was treated with warfarin was admitted with severe groin pain on the left hip. A few days later he had reduced strength in hip flexion and knee extension, absent patellar tendon reflex, and decreased sensibility of the anterior thigh and the medial lower leg. A magnetic resonance imaging revealed a large haematoma in the left iliac muscle. Iliac haematoma-induced femoral nerve compression neuropathy is a rare condition but should be considered as a differential diagnosis for L4 root compression in patients, who are receiving anticoagulant therapy...
August 14, 2017: Ugeskrift for Laeger
https://www.readbyqxmd.com/read/28864031/comparison-of-wound-complications-and-deep-infections-with-direct-anterior-and-posterior-approaches-in-obese-hip-arthroplasty-patients
#19
Richard L Purcell, Nancy L Parks, John P Cody, William G Hamilton
BACKGROUND: The purpose of this study was to compare the posterior approach (PA) with the direct anterior approach (DAA) among obese and nonobese total hip arthroplasty patients to determine if obese DAA patients have a higher risk of infection or wound complications compared with obese PA patients. METHODS: We retrospectively evaluated 4651 primary total hip cases performed via anterior approach or PA between 2009 and 2015. Patients were divided into 4 study groups based on approach and body mass index (BMI): (1) DAA <35 kg/m(2), (2) DAA ≥35 kg/m(2), (3) PA <35 kg/m(2), and (4) PA ≥35 kg/m(2)...
August 4, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28860405/the-use-of-an-anterior-pelvic-internal-fixator-to-treat-disruptions-of-the-anterior-pelvic-ring-a-report-of-technique-indications-and-complications
#20
M Dahill, J McArthur, G L Roberts, M R Acharya, A J Ward, T J S Chesser
AIMS: The anterior pelvic internal fixator is increasingly used for the treatment of unstable, or displaced, injuries of the anterior pelvic ring. The evidence for its use, however, is limited. The aim of this paper is to describe the indications for its use, how it is applied and its complications. PATIENTS AND METHODS: We reviewed the case notes and radiographs of 50 patients treated with an anterior pelvic internal fixator between April 2010 and December 2015 at a major trauma centre in the United Kingdom...
September 2017: Bone & Joint Journal
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