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Steingrebe H, Spancken S, Sell S, Stein T. Effects of hip osteoarthritis on lower body joint kinematics during locomotion tasks: a systematic review and meta-analysis. Front Sports Act Living 2023; 5:1197883. [PMID: 38046934 PMCID: PMC10690786 DOI: 10.3389/fspor.2023.1197883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 10/09/2023] [Indexed: 12/05/2023] Open
Abstract
Introduction Motion analysis can be used to gain information needed for disease diagnosis as well as for the design and evaluation of intervention strategies in patients with hip osteoarthritis (HOA). Thereby, joint kinematics might be of great interest due to their discriminative capacity and accessibility, especially with regard to the growing usage of wearable sensors for motion analysis. So far, no comprehensive literature review on lower limb joint kinematics of patients with HOA exists. Thus, the aim of this systematic review and meta-analysis was to synthesise existing literature on lower body joint kinematics of persons with HOA compared to those of healthy controls during locomotion tasks. Methods Three databases were searched for studies on pelvis, hip, knee and ankle kinematics in subjects with HOA compared to healthy controls during locomotion tasks. Standardised mean differences were calculated and pooled using a random-effects model. Where possible, subgroup analyses were conducted. Risk of bias was assessed with the Downs and Black checklist. Results and Discussion A total of 47 reports from 35 individual studies were included in this review. Most studies analysed walking and only a few studies analysed stair walking or turning while walking. Most group differences were found in ipsi- and contralateral three-dimensional hip and sagittal knee angles with reduced ranges of motion in HOA subjects. Differences between subjects with mild to moderate and severe HOA were found, with larger effects in severe HOA subjects. Additionally, stair walking and turning while walking might be promising extensions in clinical gait analysis due to their elevated requirements for joint mobility. Large between-study heterogeneity was observed, and future studies have to clarify the effects of OA severity, laterality, age, gender, study design and movement execution on lower limb joint kinematics. Systematic Review Registration PROSPERO (CRD42021238237).
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Affiliation(s)
- Hannah Steingrebe
- BioMotion Center, Institute of Sports and Sports Science, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
- Sports Orthopedics, Institute of Sports and Sports Science, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Sina Spancken
- BioMotion Center, Institute of Sports and Sports Science, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Stefan Sell
- Sports Orthopedics, Institute of Sports and Sports Science, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
- Joint Center Black Forest, Hospital Neuenbürg, Neuenbürg, Germany
| | - Thorsten Stein
- BioMotion Center, Institute of Sports and Sports Science, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
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Stasi S, Sarantis M, Papathanasiou G, Evaggelou-Sossidis G, Stamou M, Tzefronis D, Macheras G. Stair Climbing Ability and Identification of the Nine Stairs Ascent and Descent Test Cut-Off Points in Hip Osteoarthritis Patients: A Retrospective Study. Cureus 2023; 15:e41095. [PMID: 37519506 PMCID: PMC10380059 DOI: 10.7759/cureus.41095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/28/2023] [Indexed: 08/01/2023] Open
Abstract
Objectives As the prevalence and incidence of hip osteoarthritis (hip OA) continue to rise, measuring the impact of hip OA severity on a patient's functionality is essential. Stair walking is a particularly relevant task to assess hip OA patients, as difficulty with stair ascent is one of the driving factors in deciding to undergo a total hip arthroplasty. Although stairs tests often arise in post-arthroplasty measures, there is a lack of reported stairs performance time in hip OA patients. Therefore, this retrospective study aimed to report the stair performance time of hip OA patients categorized by disease severity and determine cut-off points that differentiate between severity grades. Materials and methods The patient selection was based on the review of de-identified data from our research laboratory database. 254 hip OA patients (aged ≥ 50 years) were divided according to the Kellgren-Lawrence classification system into three groups: Grade 2 (n=68), Grade 3 (n=109), and Grade 4 (n= 68). The stair-walking ability was evaluated using the 9S-A/D test. The time taken to ascend and descend the stairs was measured separately, and the total time (9S-A/D) was also recorded. The one-way ANOVA model, Welch test, Games-Howell posthoc test, Chi-Square tests, and Two-Way ANOVA model were used for the statistical analysis of the data. The cut-off points were obtained by receiver operating curve (ROC) analysis. The statistical significance was set at p<0.05. Results Homogeneity was found between the three groups regarding demographic and clinical characteristics, except age and gender (p<0.001). The comparison of the variables (9S-ascent, 9S-descent, and 9S-A/D) between groups, adjusted for gender and age, showed significant differences: Grade 2 individuals had shorter performance times compared to those in Grade 3 and Grade 4 (p<0.005). Simultaneously, patients with Grade 3 hip OA have a shorter performance time than those with Grade 4 hip OA (p<0.005). Regarding ROC analysis of Grade 2 versus Grade 3: The AUCs of 9S-ascend, 9S-descent, and 9S-A/D were 0.742 (95%CI 0.67-0.81), 0.734 (95%CI 0.66-0.81), and 0.745 (95%CI 0.54-0.90), respectively (all p values <0.005). The cut-off points of 9S-ascend, 9S-descent, and 9S-A/D were 8.7 s (sensitivity 56%, specificity 88%), 7.1 s (sensitivity 58%, specificity 80%), and 16.25 s (sensitivity 54%, specificity 90%), respectively. Concerning ROC analysis of Grade 3 versus Grade 4: The AUCs of 9S-ascend, 9S-descent, and 9S-A/D were 0.702 (95%CI 0.62-0.78), 0.711 (95%CI 0.63-0.79), and 0.715 (95%CI 0.64-0.80), respectively (all p values <0.005). The cut-off points of 9S-ascend, 9S-descent, and 9S-A/D were 11.5 s (sensitivity 66%, specificity 65%), 8.3 s (sensitivity 71%, specificity 62%), and 19.05 s (sensitivity 71%, specificity 61%), respectively. Conclusions The study provides evidence that the progression of hip OA affected stair walking; the performance time of 9S-ascent, 9S-ascent, and 9S-A/D tests was significantly longer as the severity of hip OA worsened. ROC analysis results show tests' ability to distinguish the cut-off point between different hip OA grades. However, further research is required for the reporting and classification of stair performance time values in hip OA patients and to further investigate the ability of 9S-ascent, 9S-descent, and 9S-A/D tests to predict the grade of hip OA.
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Affiliation(s)
- Sophia Stasi
- Laboratory of Neuromuscular and Cardiovascular Study of Motion (LANECASM) Physiotherapy Department, University of West Attica (UNIWA), Athens, GRC
| | - Michail Sarantis
- Laboratory of Neuromuscular and Cardiovascular Study of Motion (LANECASM) Physiotherapy Department, University of West Attica (UNIWA), Athens, GRC
| | - George Papathanasiou
- Laboratory of Neuromuscular and Cardiovascular Study of Motion (LANECASM) Physiotherapy Department, University of West Attica (UNIWA), Athens, GRC
| | - George Evaggelou-Sossidis
- Laboratory of Neuromuscular and Cardiovascular Study of Motion (LANECASM) Physiotherapy Department, University of West Attica (UNIWA), Athens, GRC
| | - Magda Stamou
- Laboratory of Neuromuscular and Cardiovascular Study of Motion (LANECASM) Physiotherapy Department, University of West Attica (UNIWA), Athens, GRC
| | - Dimitrios Tzefronis
- 7th Orthopaedic Department, Henry Dunant Hospital, Athens, GRC
- Department of Minimal Invasive Orthopaedic Surgery, Athens Medical Center, Athens, GRC
| | - George Macheras
- 7th Orthopaedic Department, Henry Dunant Hospital, Athens, GRC
- Laboratory of Neuromuscular and Cardiovascular Study of Motion (LANECASM) Physiotherapy Department, University of West Attica (UNIWA), Athens, GRC
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Makani A, Shirazi-Adl SA, Ghezelbash F. Computational biomechanics of human knee joint in stair ascent: Muscle-ligament-contact forces and comparison with level walking. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2022; 38:e3646. [PMID: 36054682 DOI: 10.1002/cnm.3646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 07/28/2022] [Accepted: 08/23/2022] [Indexed: 06/15/2023]
Abstract
About a third of knee joint disorders originate from the patellofemoral (PF) site that makes stair ascent a difficult activity for patients. A detailed finite element model of the knee joint is coupled to a lower extremity musculoskeletal model to simulate the stance phase of stair ascent. It is driven by the mean of measurements on the hip-knee-ankle moments-angles as well as ground reaction forces reported in healthy individuals. Predicted muscle activities compare well to the recorded electromyography data. Peak forces in quadriceps (3.87 BW, body weight, at 20% instance in our 607 N subject), medial hamstrings (0.77 BW at 20%), and gastrocnemii (1.21 BW at 80%) are estimated. Due to much greater flexion angles-moments in the first half of stance, large PF contact forces (peak of 3.1 BW at 20% stance) and stresses (peak of 4.83 MPa at 20% stance) are estimated that exceed their peaks in level walking by fourfold and twofold, respectively. Compared with level walking, ACL forces diminish in the first half of stance but substantially increase later in the second half (peak of 0.76 BW at 75% stance). Under nearly similar contact forces at 20% of stance, the contact stress on the tibiofemoral (TF) medial plateau reaches a peak (9.68 MPa) twice that on the PF joint suggesting the vulnerability of both joints. Compared with walking, stair ascent increases peak ACL force and both peak TF and PF contact stresses. Reductions in the knee flexion moment and/or angle appear as a viable strategy to mitigate internal loads and pain.
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Affiliation(s)
- Amirhossein Makani
- Department of Mechanical Engineering, Polytechnique Montréal, Montreal, Québec, Canada
| | - Saeed A Shirazi-Adl
- Department of Mechanical Engineering, Polytechnique Montréal, Montreal, Québec, Canada
| | - Farshid Ghezelbash
- Department of Mechanical Engineering, Polytechnique Montréal, Montreal, Québec, Canada
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Development of Two Innovative Performance-Based Objective Measures in Feline Osteoarthritis: Their Reliability and Responsiveness to Firocoxib Analgesic Treatment. Int J Mol Sci 2022; 23:ijms231911780. [PMID: 36233085 PMCID: PMC9569873 DOI: 10.3390/ijms231911780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/21/2022] [Accepted: 09/26/2022] [Indexed: 11/23/2022] Open
Abstract
The metrological properties of two performance-based outcome measures of feline osteoarthritis (OA), namely Effort Path (Path) and Stairs Assay Compliance (Stairs), were tested. Cats naturally affected by OA (n = 32) were randomly distributed into four groups (A: 0.40, B: 0.25, C: 0.15, or D: 0.00 mg firocoxib/kg bodyweight) and assessed during baseline, treatment, and recovery periods. For Path, from an elevated walking platform, the cats landed on a pressure-sensitive mattress and jumped up onto a second elevated platform. Analysis included velocity, time to completion, peak vertical force (PVF), and vertical impulse. For Stairs, the number of steps and time to completion were recorded for 16 steps up and down in a 4 min period. Reliability was moderate to very good for Path and poor to good for Stairs. Different normalization methods are described in the manuscript. The placebo group remained stable within-time in Path, whereas treated cats trotted faster on the ramp (p < 0.0001), improved their PVF (p < 0.018) and completed the task quicker (p = 0.003). The percentage of cats completing the Stairs finish line was higher under treatment (p < 0.036), with huge effect size, the placebo group results being stable within-time. Both are promising performance-based outcome measures to better diagnose and manage feline OA pain.
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De la Fuente C, Neira A, Torres G, Silvestre R, Roby M, Yañez R, Herrera S, Martabit V, McKay I, Carpes FP. Effects of Elbow Crutch Locomotion on Gluteus Medius Activation During Stair Ascending. Front Bioeng Biotechnol 2022; 10:890004. [PMID: 35694225 PMCID: PMC9174514 DOI: 10.3389/fbioe.2022.890004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 04/21/2022] [Indexed: 11/13/2022] Open
Abstract
Crutches can help with the locomotion of people with walking disorders or functional limitations. However, little is known about hip muscle activation during stair ascending using different crutch locomotion patterns in people without disorders and limitations. Thus, we determined the acute effects of elbow crutch locomotion on gluteus medius (GM) activity during stair ascending. This comparative analytic cross-sectional study enrolled ten healthy men (22.0 ± 0.47 years). Participants climbed up the stairs with elbow crutches using one or two crutches, with ipsilateral or contralateral use, and after loading or unloading a limb. EMG signals were recorded from anterior, middle, and posterior portions of the GM and compared between the crutch conditions. The Kruskal–Wallis test and Dunn’s multiple comparison test were performed (α = 5%). The activation of the GM increased with the ipsilateral use of crutches, with two crutches and three points, and when all the load depended only on one limb. GM activation decreased with contralateral use and in the unload limb. In conclusion, ascending stairs with elbow crutches alters the GM activation. The more critical factors were choosing the crutches’ lateral use, the number of crutches, and if the limb is loaded or unloaded while ascending the stairs. Our findings can be helpful to increase or decrease the GM activation for those who use or will use crutches.
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Affiliation(s)
- Carlos De la Fuente
- Departamento de Cs. de la Salud, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
- Laboratory of Neuromechanics, Universidade Federal do Pampa, Uruguaiana, Brazil
- Servicio de Biomecánica, Centro de Innovación, Clínica MEDS, Santiago, Chile
| | - Alejandro Neira
- Escuela Kinesiología, Facultad de Ciencias, Universidad Mayor, Santiago, Chile
| | - Gustavo Torres
- Departamento de Cs. de la Salud, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Rony Silvestre
- Servicio de Biomecánica, Centro de Innovación, Clínica MEDS, Santiago, Chile
| | - Matias Roby
- Servicio de Biomecánica, Centro de Innovación, Clínica MEDS, Santiago, Chile
- Traumatología, Clínica MEDS, Santiago, Chile
| | - Roberto Yañez
- Servicio de Biomecánica, Centro de Innovación, Clínica MEDS, Santiago, Chile
- Traumatología, Clínica MEDS, Santiago, Chile
| | - Sofia Herrera
- Departamento de Cs. de la Salud, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Virgina Martabit
- Departamento de Cs. de la Salud, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Isabel McKay
- Departamento de Cs. de la Salud, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Felipe P. Carpes
- Laboratory of Neuromechanics, Universidade Federal do Pampa, Uruguaiana, Brazil
- *Correspondence: Felipe P. Carpes,
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Diamond LE, Devaprakash D, Cornish B, Plinsinga ML, Hams A, Hall M, Hinman RS, Pizzolato C, Saxby DJ. Feasibility of personalised hip load modification using real-time biofeedback in hip osteoarthritis: A pilot study. OSTEOARTHRITIS AND CARTILAGE OPEN 2022; 4:100230. [DOI: 10.1016/j.ocarto.2021.100230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 11/30/2021] [Accepted: 12/20/2021] [Indexed: 11/29/2022] Open
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Popovic T, Samaan MA, Link TM, Majumdar S, Souza RB. Patients with Symptomatic Hip Osteoarthritis Have Altered Kinematics during Stair Ambulation. PM R 2020; 13:128-136. [PMID: 32383300 DOI: 10.1002/pmrj.12398] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 04/27/2020] [Accepted: 04/29/2020] [Indexed: 01/01/2023]
Abstract
BACKGROUND Osteoarthritis (OA) is a degenerative joint disease. Understanding contributing factors to slowing or stopping disease progression is crucial. There has been no research describing lower extremity kinematics of the hip, knee, and ankle during stair ambulation in individuals with hip OA. OBJECTIVE To explore the differences in lower extremity kinematics between participants with clinical and morphological findings of hip OA and controls. DESIGN A cross-sectional study. SETTING Clinical research laboratory. PARTICIPANTS Participants with radiographic and symptomatic signs of hip OA (n = 42) and healthy controls (n = 30) were enrolled. INTERVENTIONS Participants underwent hip magnetic resonance imaging (MRI). The Scoring Hip Osteoarthritis with MRI (SHOMRI) method was used to assess cartilage abnormalities. Self-reported measures of hip pain and function were obtained using the Hip Disability and Osteoarthritis Outcome Score (HOOS). Participants were assigned into a symptomatic hip osteoarthritis group (HOA) with SHOMRI>0 and HOOS≤80, and a control group (CG) with SHOMRI = 0 and HOOS>90. Patients underwent 3D motion analysis during stair ascent/descent at self-selected speed. MAIN OUTCOME MEASURES The primary outcome measurements were peak hip, knee, and ankle kinematics. General Estimation Equations were used to compare kinematics between groups (P ≤ .05). RESULTS The HOA group ascended stairs with a more internally rotated hip (CG = 1.77 ± 6.3; HOA = 4.97 ± 4.2; P = .02), more abducted hip (CG = -5 ± 2.7, HOA = -3.5 ± 3; P = .02), and a more externally rotated knee (CG = -8.02 ± 3; HOA = -10.63 ± 6.3; P = .02) and ankle (CG = -11.8 ± 6.1; HOA = -16.3 ± 5.6; P = .01). Similarly, HOA participants descended stairs with a more extended knee (CG = -15.5 ± 4.9; HOA = -12 ± 4.9; P = .01), and more externally rotated knee (CG = -10.1 ± 4.4; HOA = -13.1 ± 6.6; P = .04) and ankle (CG = -13.5 ± 5.3; HOA = -17.9 ± 5.5; P = .002). CONCLUSION Participants with hip OA-related morphology and symptoms ambulate stairs utilizing abnormal lower extremity mechanics.
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Affiliation(s)
- Tijana Popovic
- Musculoskeletal Quantitative Imaging Research, Department of Radiology and Biomedical Imaging, University of California-San Francisco, San Francisco, CA, USA
| | - Michael A Samaan
- Musculoskeletal Quantitative Imaging Research, Department of Radiology and Biomedical Imaging, University of California-San Francisco, San Francisco, CA, USA.,Department of Kinesiology and Health Promotion, University of Kentucky, Lexington, KY, USA
| | - Thomas M Link
- Musculoskeletal Quantitative Imaging Research, Department of Radiology and Biomedical Imaging, University of California-San Francisco, San Francisco, CA, USA
| | - Sharmila Majumdar
- Musculoskeletal Quantitative Imaging Research, Department of Radiology and Biomedical Imaging, University of California-San Francisco, San Francisco, CA, USA
| | - Richard B Souza
- Musculoskeletal Quantitative Imaging Research, Department of Radiology and Biomedical Imaging, University of California-San Francisco, San Francisco, CA, USA.,Department of Physical Therapy and Rehabilitation Science, University of California-San Francisco, San Francisco, CA, USA
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DeFrate LE, Kim-Wang SY, Englander ZA, McNulty AL. Osteoarthritis year in review 2018: mechanics. Osteoarthritis Cartilage 2019; 27:392-400. [PMID: 30597275 PMCID: PMC6489451 DOI: 10.1016/j.joca.2018.12.011] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 12/20/2018] [Accepted: 12/20/2018] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To review recent biomechanics literature focused on the interactions between biomechanics and articular cartilage health, particularly focused on macro-scale and human studies. DESIGN A literature search was conducted in PubMed using the search terms (biomechanics AND osteoarthritis) OR (biomechanics AND cartilage) OR (mechanics AND osteoarthritis) OR (mechanics AND cartilage) for publications from April 2017 to April 2018. RESULTS Abstracts from the 559 articles generated from the literature search were reviewed. Due to the wide range of topics, 62 full texts with a focus on in vivo biomechanical studies were included for further discussion. Several overarching themes in the recent literature were identified and are summarized, including 1) new methods to detect early osteoarthritis (OA) development, 2) studies describing healthy and OA cartilage and biomechanics, 3) ACL injury and OA development, 4) meniscus injury and OA development, and 5) OA prevention, treatment, and management. CONCLUSIONS Mechanical loading is a critical factor in the maintenance of joint health. Abnormal mechanical loading can lead to the onset and progression of OA. Thus, recent studies have utilized various biomechanical models to better describe the etiology of OA development and the subsequent effects of OA on the mechanics of joint tissues and whole body biomechanics.
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Affiliation(s)
- Louis E. DeFrate
- Department of Orthopaedic Surgery, Duke University School of Medicine, Duke University, Durham, North Carolina, USA,Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA,Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina, USA
| | - Sophia Y. Kim-Wang
- Department of Orthopaedic Surgery, Duke University School of Medicine, Duke University, Durham, North Carolina, USA,Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA
| | - Zoë A. Englander
- Department of Orthopaedic Surgery, Duke University School of Medicine, Duke University, Durham, North Carolina, USA,Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA
| | - Amy L. McNulty
- Department of Orthopaedic Surgery, Duke University School of Medicine, Duke University, Durham, North Carolina, USA,Department of Pathology, Duke University School of Medicine, Duke University, Durham, North Carolina, USA
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Validity of motion analysis using the Kinect system to evaluate single leg stance in patients with hip disorders. Gait Posture 2018; 62:458-462. [PMID: 29665566 DOI: 10.1016/j.gaitpost.2018.04.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 04/01/2018] [Accepted: 04/06/2018] [Indexed: 02/02/2023]
Abstract
BACKGROUND Abnormal movements during single leg stance in patients with hip disorders could be detected by the Kinect system as well as the three-dimensional motion analysis system. However, validity of the Kinect system to evaluate single leg stance in patients with hip disorders remains unknown. RESEARCH QUESTION To investigate the concurrent validity of the Kinect system, relative to the VICON three-dimensional system which is considered as the gold standard for motion analysis, to measure trunk and pelvis alignment during single leg stance. To investigate the discriminant validity of the Kinect system between with and without hip disorders. METHODS For evaluation of the concurrent validity of the Kinect system, the intra-class correlation coefficient (ICC (3,1)) was calculated for the angle of inclination of the pelvis and trunk in 5 healthy individuals. For evaluation of the discriminant validity of the Kinect system, the angle of inclination of the pelvis and trunk during single leg stance were measured in 27 individuals with hip disorders and 100 healthy individuals. Differences in the maximum angle of inclination of the pelvis and trunk were evaluated between hip disorders and healthy individuals using the Mann-Whitney U test. RESULTS ICC values were between 0.83-0.93 for the pelvic and 0.63-0.81 for the trunk angle, respectively. The maximum trunk inclination angle calculated using the Kinect system was significantly higher in patients with hip disorders than healthy individuals, with no significant between-group difference in the angle of inclination of the pelvis. SIGNIFICANCE The Kinect system was adequate to detect certain abnormal movements during single leg stance among patients with hip disorders. Therefore, the Kinect system could provide a convenient motion analysis tool for the assessment of patients with hip disorders.
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Song YS, Ha S, Hsu H, Ting LH, Liu CK. Stair negotiation made easier using novel interactive energy-recycling assistive stairs. PLoS One 2017; 12:e0179637. [PMID: 28700719 PMCID: PMC5507489 DOI: 10.1371/journal.pone.0179637] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Accepted: 06/01/2017] [Indexed: 11/19/2022] Open
Abstract
Here we show that novel, energy-recycling stairs reduce the amount of work required for humans to both ascend and descend stairs. Our low-power, interactive, and modular steps can be placed on existing staircases, storing energy during stair descent and returning that energy to the user during stair ascent. Energy is recycled through event-triggered latching and unlatching of passive springs without the use of powered actuators. When ascending the energy-recycling stairs, naive users generated 17.4 ± 6.9% less positive work with their leading legs compared to conventional stairs, with the knee joint positive work reduced by 37.7 ± 10.5%. Users also generated 21.9 ± 17.8% less negative work with their trailing legs during stair descent, with ankle joint negative work reduced by 26.0 ± 15.9%. Our low-power energy-recycling stairs have the potential to assist people with mobility impairments during stair negotiation on existing staircases.
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Affiliation(s)
- Yun Seong Song
- Department of Mechanical Engineering, Missouri University of Science and Technology, Rolla, Missouri, United States of America
| | - Sehoon Ha
- Disney Research, Pittsburgh, Pennsylvania, United States of America
| | - Hsiang Hsu
- Department of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, United States of America
| | - Lena H. Ting
- Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, United States of America
- Department of Rehabilitation Medicine, Division of Physical Therapy, Emory University, Atlanta, Georgia, United States of America
| | - C. Karen Liu
- School of Interactive Computing, Georgia Institute of Technology, Atlanta, Georgia, United States of America
- * E-mail:
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