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1.
Bone Joint J ; 102-B(7_Supple_B): 52-56, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32600208

RESUMO

AIMS: Of growing concern in arthroplasty is the emergence of atypical infections, particularly Cutibacterium (formerly Propionibacterium) sp. infections. Currently, the dermal colonization rate of Cutibacterium about the hip is unknown. Therefore, the aim of this study was to investigate colonization rates of Cutibacterium sp. at locations approximating anterior and posterolateral approaches to the hip joint. METHODS: For this non-randomized non-blinded study, 101 adult patients scheduled for hip or knee surgery were recruited. For each, four 3 mm dermal punch biopsies were collected after administration of anaesthesia, but prior to antibiotics. Prebiopsy skin preparation consisted of a standardized preoperative 2% chlorhexidine skin cleansing protocol and an additional 70% isopropyl alcohol mechanical skin scrub immediately prior to biopsy collection. Two skin samples 10 cm apart were collected from a location approximating a standard direct anterior skin incision, and two samples 10 cm apart were collected from a lateral skin incision (suitable for posterior, direct-lateral, or anterolateral approaches). Samples were cultured for two weeks using a protocol optimized for Cutibacterium. RESULTS: A total of 23 out of 404 cultures (collected from 101 patients) were positive for a microorganism, with a total of 22 patients having a positive culture (22%). Overall, 15 of the cultures in 14 patients were positive for Cutibacterium sp. (65%), of which Cutibacterium acnes comprised the majority (n = 13; 87%). Other isolated microorganisms include coagulase-negative Staphylococcus (n = 6), Clostridium (n = 1), and Corynebacterium (n = 1). Of all positive cultures, 15 were obtained from the anterior location (65%), of which seven (60%) were from the most proximal biopsy location. However, these findings were not statistically significant (anterior vs lateral, p = 0.076; proximal vs distal, p =0.238). CONCLUSION: Approximately 14% (14/101) of the patients demonstrated a positive Cutibacterium colonization about the hip, the majority anteriorly. Given the high colonization rate of Cutibacterium, alternative skin preparations for total hip arthroplasty should be considered. Cite this article: Bone Joint J 2020;102-B(7 Supple B):52-56.


Assuntos
Quadril/microbiologia , Propionibacteriaceae/isolamento & purificação , Pele/microbiologia , Coxa da Perna/microbiologia , Adulto , Idoso , Artroplastia de Quadril , Biópsia , Clostridium/isolamento & purificação , Corynebacterium/isolamento & purificação , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Staphylococcus/isolamento & purificação
2.
Medicine (Baltimore) ; 99(26): e20874, 2020 Jun 26.
Artigo em Inglês | MEDLINE | ID: mdl-32590794

RESUMO

INTRODUCTION: Idiopathic necrotizing fasciitis (NF) is an infrequent, highly lethal skin infection that spreads rapidly, marked by fascia and subcutaneous tissue necrosis. It occurs in the absence of a known causative factor. Its emergence after sterile orthopedic fixation with unexpected spread to the abdomen may turn to be challenging both as a medical and surgical emergency. PATIENT CONCERNS: A 56-year-old diabetic female presented with multiple fractures. After open reduction and internal fixation (ORIF) with iliac crest grafting of hip fracture, she developed incisional NF which later spread to the abdomen. DIAGNOSIS: Post-ORIF of hip fracture complicated with idiopathic NF and abdominal spread. INTERVENTIONS: She underwent emergency débridements with negative pressure wound therapy and broad-spectrum intravenous antibiotic therapy. After granulation, the wounds were closed with skin flaps and grafts with antibiotic beads. When the NF spread to the abdomen, additional débridements during abdominal explorations were performed. OUTCOMES: The patient was initially stable with promising healings of the wounds. Later, the patient suddenly developed a high fever and severe abdominal pain. Ultrasound revealed that NF emerged unexpectedly in the right lower abdomen. The causative agent of the NF remained undetected. Despite all the extensive treatments, the patient's condition deteriorated rapidly. She died of septic shock and multiple organ failure. CONCLUSION: The idiopathic NF may still potentially occur after a clean ORIF of the hip region. The implementation of intensive guideline-based treatments may show improvements, but the risk of unexpected NF spread to the abdomen should be anticipated, which may increase the mortality rates in diabetic or immunocompromised patients.


Assuntos
Fasciite Necrosante/etiologia , Fraturas Ósseas/cirurgia , Acidentes de Trânsito , Antibacterianos/uso terapêutico , Desbridamento/métodos , Diabetes Mellitus , Feminino , Fraturas Ósseas/complicações , Quadril/cirurgia , Humanos , Pessoa de Meia-Idade , Tratamento de Ferimentos com Pressão Negativa/métodos , Redução Aberta/efeitos adversos , Redução Aberta/métodos , Complicações Pós-Operatórias/etiologia , Complicações Pós-Operatórias/fisiopatologia , Cicatrização/efeitos dos fármacos , Cicatrização/fisiologia
3.
J Arthroplasty ; 35(7S): S82-S84, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32354537

RESUMO

As soon as it became clear that our economy was going to be paralyzed by the SARS-CoV-2 pandemic, the American Association of Hip and Knee Surgeons leadership acted swiftly to ensure that our members were going to be eligible for the anticipated federal economic stimulus. The cessation of elective surgery, enacted in mid-March and necessary to stop the spread of the SARS-CoV-2 virus, would surely challenge the solvency of many of our members' practices. Although our advocacy efforts discussed further have helped, clearly more relief is needed. Fortunately, our mitigation efforts have led to a "flattening of the curve" and discussions have begun on when, where, and how to safely start elective surgery again.


Assuntos
Betacoronavirus , Infecções por Coronavirus , Quadril/cirurgia , Joelho/cirurgia , Pandemias , Pneumonia Viral , Infecções por Coronavirus/epidemiologia , Infecções por Coronavirus/prevenção & controle , Procedimentos Cirúrgicos Eletivos , Humanos , Procedimentos Ortopédicos , Pandemias/prevenção & controle , Pneumonia Viral/epidemiologia , Pneumonia Viral/prevenção & controle , Sociedades Médicas , Cirurgiões , Estados Unidos
4.
Surg Technol Int ; 36: 360-363, 2020 May 28.
Artigo em Inglês | MEDLINE | ID: mdl-32359169

RESUMO

INTRODUCTION: Hip dislocation is a devastating complication after total hip arthroplasty (THA), which is slightly higher when using the traditional posterior approach. The piriformis tendon is the most important dynamic posterior stabilizing structure. The piriformis-sparing technique provides a reproducible method for THA, greatly reducing the dislocation rate. MATERIALS AND METHODS: After exposure and identifying piriformis, the inferior border of the piriformis is released from the short rotators and capsule with a BOVIE® (Symmetry Surgical, Inc, Nashville, Tennessee). This dissection is continued to the lesser trochanter as one sleeve and then tagged. The anterior/inferior capsule is released with a BOVIE® from the femur to aid in acetabular exposure. The femur is roughly placed in 30° of adduction, 70° of flexion, and slight internal rotation. An anterior retractor is used to displace the proximal femur anteriorly and superiorly. The reamer is placed inside the acetabulum through the inferior approach. Next, the acetabulum is progressively reamed to the appropriate size and depth, and the final component is placed in proper anteversion and abduction angles based on preoperative functional assessment. After insertion of final components and final hip reduction, the interval beneath the piriformis tendon and superior portion of the capsule is repaired with ETHIBOND® sutures (Johnson & Johnson Inc., New Brunswick, New Jersey). Then, two tunnels in the proximal femur with a 2.7mm drill bit is made and posterior capsule and short rotators are secured through these tunnels. RESULTS: This technique was used in 150 THAs with a minimum follow up of six months and a mean of 1.2 years ± 1.5 years. There was no dislocation at final follow up. The mean anteversion and abduction was 23 ± 2.7 and 42 ± 3.1, respectively. CONCLUSION: Preserving the piriformis tendon may cause less visualization of the superior portion of the acetabulum. However, the anterior/inferior capsular release, and proper placement of the femur with flexion, internal rotation, and adduction, makes it possible to achieve highly reproducible results.


Assuntos
Artroplastia de Quadril , Prótese de Quadril , Acetábulo , Quadril , Luxação do Quadril , Articulação do Quadril , Humanos
6.
PLoS One ; 15(4): e0231407, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32315344

RESUMO

We studied the relationship between body morphometric traits, and their underlying association with milk production (MP), lactation length (LL), first calving interval (FCI) and subsequent calving interval (CI) of crossbred progeny of Murrah × Jafarabadi buffalo aiming to assist in selection programs. We carried out principal component analysis (PCA) of the body morphometric traits, which include breast width (BW), thigh width (THW), hip width (HW), rump width (RW), rump length (RL), body depth (BD), body length (BL), height withers (HEW), rear height (RH), shoulder width (SW), thorax width (TW), loin width (LW), distance from the head to ischium (DHI), and thoracic perimeter (TP). We determined the association of morphometric traits with milk/reproduction traits using canonical correlation analysis (CCA). The analysis revealed that the first six PCA accounted for 82.14% of the total observed variation, and the traits THW, HW, TW, LW, RW, HEW, TP, RH, and BW, accounted for almost half (48.00%) of the total variance indicating a higher contribution in body structural conformation. The first canonical function was significant (p<0.05), accounted for 72.46% of the total variance, and the canonical correlation was 0.56, indicating the dependence between both groups of traits. Higher canonical loadings were obtained for LL (0.49), FCI (0.46), BW (-0.71), BL (-0.56), DHI (-0.34), HEW, (-0.38) and TP (-0.50). These traits were most important for the derivation of canonical statistical variables, and presented a higher canonical correlations (r) between the dependent (LL/FCI) and independent (BW, BL, DHI, HEW and TP) groups. The results could suggest that the body morphometric traits THW, HW, TW, LW, RW, HEW, BD, TP, RH, and BW could play important role in body structural composition, indicating a suitable functional type, and aid designing of selection programs for buffalo breeding.


Assuntos
Búfalos/fisiologia , Leite/metabolismo , Reprodução , Animais , Brasil , Cruzamento , Quadril/fisiologia , Extremidade Inferior/fisiologia , Análise de Componente Principal , Ombro/fisiologia , Tórax/fisiologia
7.
J Sports Sci ; 38(10): 1140-1149, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32252603

RESUMO

An essential component of any physical preparation programme is the selection of training exercises to facilitate desired performance outcomes, with practitioners balancing the principles of sports training to inform exercise selection. This study aimed to advance biomechanical understanding of the principles of overload and specificity within exercise selection, utilising novel joint kinetic and intra-limb joint coordination analyses. Three-dimensional kinematic and kinetic data were obtained from six male sprinters (100 m PB, 10.64-11.00) performing block starts (competitive motor task) and seven training exercises that encompassed traditionally viewed general and more specific exercises. Results highlighted the challenging nature of exercise selection, with all exercises demonstrating capacity to overload relevant joint kinetic features of the block start. In addition, all exercises were able to promote the emergence of proximal and in-phase extension joint coordination patterns linked with block start execution, although traditionally viewed non-specific exercises elicited greater overall coordination similarity. The current research helps advance biomechanical understanding of overload and specificity within exercise selection, by demonstrating how exercise selection should not solely be based on perceived replication of a competitive motor task. Instead, practitioners must consider how the musculoskeletal determinants of performance are overloaded, in addition to promoting task specific coordination patterns.


Assuntos
Extremidade Inferior/fisiologia , Condicionamento Físico Humano/métodos , Adulto , Tornozelo/fisiologia , Fenômenos Biomecânicos , Comportamento Competitivo/fisiologia , Estudos Transversais , Quadril/fisiologia , Humanos , Joelho/fisiologia , Masculino , Treinamento de Resistência/métodos , Estudos de Tempo e Movimento , Adulto Jovem
8.
J Sports Sci ; 38(9): 1036-1045, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32228156

RESUMO

This study validated sedentary behaviour (SB), moderate-to-vigorous physical activity (MVPA) and vigorous physical activity (VPA) accelerometer cut-points in 5-7-year-old children. Participants (n = 49, 55% girls) wore an ActiGraph GT9X accelerometer, recording data at 100 Hz downloaded in 1 s epochs, on both wrists and the right hip during a standardised protocol and recess. Cut-points were generated using ROC analysis with direct observation as a criterion. Subsequently, cut-points were optimised using Confidence intervals equivalency analysis and then cross-validated in a cross-validation group. SB cut-points were 36 mg (Sensitivity (Sn) = 79.8%, Specificity (Sp) = 56.8%) for non-dominant wrist, 39 mg (Sn = 75.4%, Sp = 70.2%) for dominant wrist and 20 mg (Sn = 78%, Sp = 50.1%) for hip. MVPA cut-points were 189 mg (Sn = 82.6%, Sp = 78%) for non-dominant wrist, 181 mg (Sn = 79.1%, Sp = 76%) for dominant wrist and 95 mg (Sn = 79.3%, Sp = 75.6%) for hip. VPA cut-points were 536 mg (Sn = 75.1%, Sp = 68.7%) for non-dominant wrist, 534 mg (Sn = 67.6%, Sp = 95.6%) for dominant wrist and 325 mg (Sn = 78.2%, Sp = 96.1%) for hip. All placements demonstrated adequate levels of accuracy for SB and PA assessment.


Assuntos
Acelerometria/métodos , Exercício Físico , Monitores de Aptidão Física , Comportamento Sedentário , Criança , Pré-Escolar , Feminino , Quadril , Humanos , Masculino , Curva ROC , Reprodutibilidade dos Testes , Punho
9.
PLoS One ; 15(3): e0230185, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32155212

RESUMO

OBJECTIVE: To investigate the impact of metabolic syndrome and its components on osteoarthritis of the hip joints compared to a healthy cohort in the KORA MRI-study. METHODS: Randomly selected men and women from the general population were classified as having metabolic syndrome, defined as presence of central obesity plus two of the following four components: elevated blood pressure (BP), elevated fasting glucose, elevated triglycerides (TG) and low HDL-cholesterol (HDL-c), or as controls without metabolic syndrome. Therefore, each subject underwent detailed assessment of waist circumference as well as fasting glucose, systolic and diastolic BP, TG, and HDL-c concentrations as well as a full-body MR scan. MR measurements were performed on a 3 Tesla scanner (Magnetom Skyra, Siemens) including a dual-echo Dixon and a T2 SS-FSE sequence for anatomical structures. In order to quantify osteoarthritis of the hip, assessment was performed by two independent, experienced radiologists for joint gap narrowing, osteophytic lipping and subchondral changes (e.g. sclerosis, pseudocysts). Associations between metabolic syndrome components and hip degeneration were estimated by logistic regression models providing odds ratios. RESULTS: Among 354 included participants (mean age: 56.1 ± 9.2 years; 55.4% male), 119 (34%) had metabolic syndrome, while 235 (66%) were part of the control group. Except for elevated blood glucose (p = 0.02), none of the metabolic syndromes' component was independently associated with osteoarthritis. Multivariable adjusted ORs for osteoarthritis of the right hip were 1.00 (95% CI 0.98;1.03), 1.00 (95% CI 0.99;1.00), 1.01 (95% CI 0.99;1.03), 1.00 (95% CI 0.97;1.04) and 1.01 (95% CI 0.96;1.06), and for the left hip 1.00 (95% CI 0.98;1.03), 1.00 (95% CI 1.00;1.01), 1.01 (95% CI 0.99;1.03), 0.99 (95% CI 0.96;1.02) and 1.04 (95% CI 0.99;1.09) for waist circumference, triglyceride, HDL-c and systolic and diastolic BP, respectively. Blood glucose was a borderline non-dependent factor for osteoarthritis of the right hip (OR: 1.02 (95% CI 1.0;1.04); p = 0.05). Furthermore, the compound metabolic syndrome was not significantly associated (OR left hip: 1.53 (95% CI 0.8;2.92), p = 0.20; OR right hip: 1.33 (95% CI 0.72;2.45), p = 0.37) with osteoarthritis of the hip joint. Age as well as gender (left hip) were the only parameters in univariate and multivariate analysis to be significantly associated with osteoarthritis of the hip joint. CONCLUSION: The compound metabolic syndrome showed no association with osteoarthritis of the hip joint. Age was the only parameter to be dependently and independently associated to osteoarthritis of both hip joints, while elevated blood glucose was independently associated with degeneration of the right hip joint.


Assuntos
Síndrome Metabólica/epidemiologia , Osteoartrite do Quadril/epidemiologia , Adulto , Fatores Etários , Idoso , Glicemia/metabolismo , Pressão Sanguínea , Índice de Massa Corporal , HDL-Colesterol/sangue , LDL-Colesterol/sangue , Estudos Transversais , Feminino , Alemanha/epidemiologia , Quadril/fisiopatologia , Humanos , Modelos Logísticos , Imagem por Ressonância Magnética/métodos , Masculino , Pessoa de Meia-Idade , Obesidade/complicações , Razão de Chances , Osteoartrite do Quadril/complicações , Triglicerídeos/sangue , Circunferência da Cintura
10.
J Sports Sci ; 38(7): 787-794, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32131691

RESUMO

This study identified key somatic and demographic characteristics that benefit all swimmers and, at the same time, identified further characteristics that benefit only specific swimming strokes. Three hundred sixty-three competitive-level swimmers (male [n = 202]; female [n = 161]) participated in the study. We adopted a multiplicative, allometric regression model to identify the key characteristics associated with 100 m swimming speeds (controlling for age). The model was refined using backward elimination. Characteristics that benefited some but not all strokes were identified by introducing stroke-by-predictor variable interactions. The regression analysis revealed 7 "common" characteristics that benefited all swimmers suggesting that all swimmers benefit from having less body fat, broad shoulders and hips, a greater arm span (but shorter lower arms) and greater forearm girths with smaller relaxed arm girths. The 4 stroke-specific characteristics reveal that backstroke swimmers benefit from longer backs, a finding that can be likened to boats with longer hulls also travel faster through the water. Other stroke-by-predictor variable interactions (taken together) identified that butterfly swimmers are characterized by greater muscularity in the lower legs. These results highlight the importance of considering somatic and demographic characteristics of young swimmers for talent identification purposes (i.e., to ensure that swimmers realize their most appropriate strokes).


Assuntos
Destreza Motora/fisiologia , Natação/fisiologia , Adolescente , Aptidão , Braço/anatomia & histologia , Distribuição da Gordura Corporal , Tamanho Corporal , Criança , Comportamento Competitivo , Feminino , Quadril/anatomia & histologia , Humanos , Perna (Membro)/anatomia & histologia , Masculino , Músculo Esquelético/anatomia & histologia , Ombro/anatomia & histologia , Adulto Jovem
11.
J Sports Sci ; 38(7): 827-837, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32149566

RESUMO

Purpose: This study determined the impact of menstrual status on bone tissue in elite post-pubertal female soccer players over an entire season.Methods: Fifty-one elite female soccer players participated. At baseline, forty-one were assigned to the low hormonal androgenic profile (low-HAPL) and 10 to the high hormonal androgenic profile (high-HAPL).Results: An 8-month training program led to increased bone mineral density content (p<0.05). The low-HAPL athletes improved the Narrow neck average cortical thickness (ACT) by 1.4% and reduced the corresponding Buckling ratio (BR) by 2.6%, thus decreasing the fracture risk (p<0.05). The high-HAPL athletes decreased the Narrow neck ACT by 5.4% and increased the BR by 2.6%, increasing fracture risk (p<0.05). Differences were assigned as being "very likely beneficial" for the low-HAPL athletes, supported by very large (d=3.41) and large (d=1.58) effect sizes for the Narrow neck ACT and BR, respectively.Conclusion: A season of soccer training has induced bone geometry improvements in adolescent females. Bone health parameters improved in the two clusters. However, high-HAPL athletes decreased its resistance to loading compare to low-HAPL athletes. Even if female players do not present clinical symptoms related to their hormonal status, sport medicine physicians should pay attention to their structural bone fragility.


Assuntos
Densidade Óssea/fisiologia , Hormônio Foliculoestimulante/sangue , Hormônios Esteroides Gonadais/sangue , Hormônio Luteinizante/sangue , Menstruação/fisiologia , Condicionamento Físico Humano , Futebol/fisiologia , Adolescente , Biomarcadores/sangue , Estudos Transversais , Feminino , Quadril/anatomia & histologia , Humanos , Adulto Jovem
12.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 55(3): 159-164, 2020 Mar 09.
Artigo em Chinês | MEDLINE | ID: mdl-32193911

RESUMO

Objective: To investigate the association between osteoporosis and severe periodontal attachment loss in postmenopausal women. Methods: One hundred and ninety-five postmenopausal women aged 50-65 years old were included in the present study. The participant were recruited from patients in the Peking University International Hospital and through website from March, 2017 to August, 2018. Periodontal examination, filling out a structured questionnaire and bone mass density (BMD) examination were completed to each of the participants. The clinical attachment loss (CAL), oral hygiene index simplified (OHI-S), and bleeding on probing (BOP) were examined and recorded as periodontal parameters. The structured questionnaire was used to collect information of the physical activity, socioeconomic status, marital status, oral health habits, and so on. Bone mass density of the lumbar spine and left hip were scanned by using standardized dual energy X-ray absorptiometry. Based on the T-score of BMD (difference between the measured BMD and the mean value of young white women in terms of standard deviations), osteoporosis was defined as T-score≤-2.5 (according to the World Health Organization criteria). Fourteen risk factors were preliminarily screened by chi-square test, including age, duration of menopause, body mass index (BMI), exercise habit, economic status, marital status, level of education, habit of dental visit, tooth brushing habit, usage of interdental tools, OHI-S, BOP(+)%, osteoporosis in hip and osteoporosis in lumbar. Factors with P<0.05 were selected for multivariate Logistic regression analysis. Logistic regression was used to analysis the risk factors of severe periodontal attachment loss. Results: The mean age of 195 postmenopausal women was (57.8±4.3) years. After adjusting for ages, the economic status, habit of dental visit, OHI-S and BOP(+)%, there was an association of osteoporosis in hip and severe periodontal attachment loss in postmenopausal women [odds ratios (OR)=2.466, 95% confidence intervals (CI) was 1.173-5.185, P=0.017]. Conclusions: Postmenopausal women with osteoporosis in hip has a greater chance of presenting severe periodontal attachment loss.


Assuntos
Osteoporose Pós-Menopausa/complicações , Perda da Inserção Periodontal/complicações , Absorciometria de Fóton , Idoso , Densidade Óssea , Feminino , Quadril/diagnóstico por imagem , Humanos , Pessoa de Meia-Idade , Osteoporose Pós-Menopausa/diagnóstico por imagem , Pós-Menopausa
13.
PLoS One ; 15(3): e0230654, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32210478

RESUMO

The turnout of the lower extremities is the major component of the classical ballet positions (CPs) and correctly is initiated in the hips. The aim of this research was to determine the differences in the electromyographic and kinematic variables in the five CPs in ballet students with greater and lesser amount of passive hip external rotation (HER). A group of 14 female pre-professional ballet dancers 11-16 years of age participated in the study. Based on the amount of passive HER, participants with higher values made up greater rotation group (n = 7) whereas those with lesser values formed lesser rotation group (n = 7). Electromyographic activity of 14 muscles from right side of the trunk and right lower extremity was recorded with the surface electrodes while subjects were standing in all five CPs (CP1-CP5). The external rotation of the hips, knees and feet were recorded with the motion capture system. The kinematic differences between the groups were revealed in asymmetric positions CP4 and CP5 where foot progression angle was significantly lesser in forward than backward setting only in lesser rotation group. In lesser rotation group the ankle and back muscles were more engaged in CPs while abdominal and hip muscles less when compared with greater rotation group. This finding suggests that in the group with lesser passive HER the mechanism of forced turnout was employed. The most remarkable finding in our work was that various electromyographic patterns can be observed between groups in all CPs, while kinematic differences may be marked only in asymmetric positions.


Assuntos
Dança , Eletromiografia , Músculos/fisiologia , Adolescente , Fenômenos Biomecânicos , Estudos Transversais , Feminino , Pé/fisiologia , Quadril/fisiologia , Humanos , Joelho/fisiologia , Amplitude de Movimento Articular
14.
PLoS One ; 15(3): e0230145, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32163481

RESUMO

Previous studies on joint kinetics during track and field block starts have been limited to lower-limb sagittal kinetics; however, we hypothesised that lumbopelvic extensors, lateral flexors, and hip abductors also act as substantial energy generators. The present study aimed to examine the three-dimensional lumbo-pelvic-hip kinetics to better understand the generation of mechanical energy during a block start. 3D kinematic and force data during block starts of 10 m maximal sprinting in 12 male sprinters (personal best in a 100 m sprint, 10.78 ± 0.19 s [range, 10.43-11.01 s]) were captured using a motion capture system and force platform. The three-dimensional lumbo-pelvic-hip kinetics were calculated. The peak lumbosacral extension torque (3.64 ± 0.39 Nm/kg) was significantly larger than any other lower-limb and lumbosacral torques (<3.0 Nm/kg). It was suggested that large lumbopelvic extension torques are needed during the block start to anchor the pelvis by cancelling out both hip extension torques acting on the pelvis, leading to hip extensor-induced thigh sagittal rotations rather than pelvic posterior tilt. During the double-stance phase, the lumbosacral extensors generated mechanical energy (0.35 ± 0.16 J/kg, 14 ± 4% of the sum of lumbosacral and lower-limb net joint work). During the single-stance phase, the sum of the net mechanical work by lumbosacral lateral flexors and front hip abductors was 0.35 ± 0.14 J/kg, which comprised 9 ± 3% of the sum of the net joint work. The results lead to the speculation of the importance of strengthening not only the leg extensors, but also the lumbopelvic extensors, lateral flexors, and hip abductors for block starts. Further training studies to verify this speculation will improve training strategies for the track and field block start performance.


Assuntos
Desempenho Atlético/fisiologia , Quadril/fisiologia , Pelve/fisiologia , Coxa da Perna/fisiologia , Atletismo/fisiologia , Adulto , Fenômenos Biomecânicos/fisiologia , Articulação do Quadril/fisiologia , Humanos , Cinética , Articulação do Joelho/fisiologia , Masculino , Postura/fisiologia , Corrida/fisiologia , Estudos de Tempo e Movimento , Torque , Adulto Jovem
15.
Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi ; 34(3): 404-408, 2020 Mar 15.
Artigo em Chinês | MEDLINE | ID: mdl-32174091

RESUMO

Objective: To review the progress of hip fracture treatment in children. Methods: Literature about the hip fracture treatment in children was extensively reviewed and summarized in terms of anatomy and blood supply, fracture classification, surgical treatment principles, and complications. Results: The anatomical structure of children's hips and the characteristics of peripheral blood supply constantly change with age. Delbet classification is the most classic classification of hip fracture in children. Children's age and Delbet classification have significant effects on surgical treatment strategies and post-fracture complications. The timing of surgical treatment, accurate anatomical reduction, and appropriate internal fixation can effectively improve the prognosis and reduce the incidence of complications. Common complications include osteonecrosis of the femoral head, coxa vara, premature physeal closure, and nonunion. Conclusion: There are still some controversies on the treatment concept and internal fixation choice for children's hip fracture. So it is necessary to further study the anatomy and blood supply characteristics of children's hip, improve the selection and application skills of internal fixation devices, so as to avoid serious complications.


Assuntos
Fraturas do Colo Femoral/cirurgia , Fixação de Fratura , Fraturas do Quadril/cirurgia , Criança , Fixação Interna de Fraturas , Quadril , Humanos , Resultado do Tratamento
17.
BMC Bioinformatics ; 21(Suppl 2): 86, 2020 Mar 11.
Artigo em Inglês | MEDLINE | ID: mdl-32164524

RESUMO

BACKGROUND: The current study's purpose is to compare hip structural analysis variables in a group of postmenopausal women with sarcopenia and another group of postmenopausal women with normal skeletal muscle mass index. To do so, the current study included 8 postmenopausal women (whose ages ranged between 65 and 84 years) with sarcopenia and 60 age-matched controls (with normal skeletal muscle mass index (SMI)). Body composition and bone parameters were evaluated by dual-energy X-ray absorptiometry (DXA). RESULTS: Weight, lean mass, body mass index, femoral neck cross-sectional area (FN CSA), FN section modulus (Z), FN cross sectional moment of inertia (CSMI), intertrochanteric (IT) CSA, IT Z, IT CSMI, IT cortical thickness (CT), femoral shaft (FS) CSA, FS Z and FS CSMI were significantly greater (p < 0.05) in women with normal SMI compared to women with sarcopenia. In the whole population, SMI was positively associated with IT CSA, IT Z, IT CSMI, IT CT, FS CSA, FS Z, FS CSMI, FS CT but negatively correlated to IT buckling ratio (BR) and FS BR. CONCLUSION: The current study suggests that sarcopenia has a negative effect on hip bone strength indices in postmenopausal women.


Assuntos
Quadril/diagnóstico por imagem , Sarcopenia/patologia , Absorciometria de Fóton , Idoso , Idoso de 80 Anos ou mais , Índice de Massa Corporal , Peso Corporal , Densidade Óssea , Estudos de Casos e Controles , Feminino , Colo do Fêmur/diagnóstico por imagem , Quadril/anatomia & histologia , Humanos , Líbano , Pós-Menopausa
18.
Orthopade ; 49(6): 538-542, 2020 Jun.
Artigo em Alemão | MEDLINE | ID: mdl-32052076

RESUMO

The diagnosis and treatment of idiopathic chondrolysis of the hips are described in the case of a 12-year-old girl. The patient presented with intermittent pain and extreme dysfunction of both hips. After clinical examination and pelvic X­ray, MRI showed the typical changes of idiopathic chondrolysis. Purely conservative treatment with systematic physiotherapy and regular application of a non-steroidal anti-inflammatory drug produced a good clinical result.


Assuntos
Doenças das Cartilagens/diagnóstico por imagem , Cartilagem Articular/diagnóstico por imagem , Articulação do Quadril/diagnóstico por imagem , Quadril/diagnóstico por imagem , Adolescente , Criança , Feminino , Humanos , Imagem por Ressonância Magnética , Radiografia
19.
Adv Clin Exp Med ; 29(1): 51-61, 2020 01.
Artigo em Inglês | MEDLINE | ID: mdl-32017475

RESUMO

BACKGROUND: The reorganization of bone tissue is closely associated with its metabolism and changes in its internal structure. Metabolism of the bone, which results from the simultaneous processes of resorption and formation of new bone tissue, may depend on the presence and type of arthritis. OBJECTIVES: The objective of the study was to assess, based on the morphological features and mineral composition of bone tissue, changes in the femoral head in various types of hip joint degeneration. MATERIAL AND METHODS: The study group consisted of 21 patients surgically treated for hip joint degeneration. They included 17 women, aged 30-70 years (mean age 52.5 years), and 4 men, aged 38-51 (mean age 48.5 years). The assessment of the morphological condition of the bone and the mineral composition of bone tissue took into account quantitative and qualitative relationships among the mineral components and bone matrix. The structure of spongious bone tissue was analyzed in histological studies, with special attention paid to osteogenesis and osteoclastic processes and the advancement of degeneration. RESULTS: Three main types of degenerative changes in bone tissue of the examined femoral head were recognized: osteoporosis with a prevalence of coarse-fiber bone tissue and decreased osteogenic activity; osteolysis with few osteogenesis centers; and intensified reorganization of bone tissue. In more than half of the examined samples, coarse-fiber bone tissue was replaced by newly formed bone tissue. We observed bone resorption and osteogenesis, which indicate normal homeostasis of the bone tissue. Uneven saturation of spongious bone with mineral components was found. The content of organic and inorganic bone components measured with Ca : P and C : Ca + P ratios had similar values in all types of changes. Only the bone with intense osteolysis contained a smaller quantity of carbon (4.96-8.13%). CONCLUSIONS: Our observations indicate an intense adaptive reorganization of bone tissue depending on external and internal factors, including biomechanical condition.


Assuntos
Remodelação Óssea , Reabsorção Óssea , Quadril , Osteogênese , Osteólise , Osteoporose , Adulto , Idoso , Densidade Óssea , Osso e Ossos , Feminino , Quadril/patologia , Humanos , Masculino , Pessoa de Meia-Idade , Osteoclastos , Osteólise/patologia , Osteoporose/patologia
20.
Int J Sports Med ; 41(6): 412-418, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32045950

RESUMO

Patellofemoral joint (PFJ) pain syndrome is a commonly reported form of pain in female runners and military personnel. Increased PFJ stress may be a contributing factor. Few studies have examined PFJ stress running with added load. Our purpose was to analyze PFJ stress, PFJ reaction force, quadriceps force, knee flexion angle, and other kinematic and temporospatial variables running with and without a 9 kg load. Nineteen females ran across a force platform with no added load and 9.0 kg weight vest. Kinematic data were collected using 3D motion capture and kinetic data with a force platform. Muscle forces were estimated using a musculoskeletal model, and peak PFJ loading variables were calculated during stance. Multivariate analyses were run on PFJ loading variables and on cadence, step length and foot strike index. Differences were shown in PFJ stress, PFJ reaction force, peak knee flexion angle and quadriceps force. Joint specific kinetic variables increased between 5-16% with added load. PFJ loading variables increased with 9 kg of added load without changes in cadence, step length, or foot strike index compared to no load. Added load appears to increase the PFJ loading variables associated with PFJ pain in running.


Assuntos
Articulação Patelofemoral/fisiologia , Corrida/fisiologia , Suporte de Carga/fisiologia , Adolescente , Fenômenos Biomecânicos , Feminino , Quadril/fisiologia , Humanos , Músculo Esquelético/fisiologia , Síndrome da Dor Patelofemoral/fisiopatologia , Fatores de Risco , Fatores Sexuais , Estresse Mecânico , Adulto Jovem
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