scholarly journals Reliability and concurrent validity of TRAZER compared to 3-dimensional motion capture

2021 ◽  
Keyword(s):  
Motion Capture ◽  
Concurrent Validity ◽  
3 Dimensional

Smartphone Inclinometry Is a Valid and Reliable Tool for Measuring Frontal Plane Tibial Alignment in Healthy and Osteoarthritic Knees

2021 ◽  
Author(s):  
Calvin T F Tse ◽  
Jesse M Charlton ◽  
Jennifer Lam ◽  
Joanne Ho ◽  
Jessica Bears ◽  
...  
Keyword(s):  
Knee Osteoarthritis ◽  
Motion Capture ◽  
Concurrent Validity ◽  
Clinical Decision Making ◽  
Frontal Plane ◽  
Healthy Individuals ◽  
Validity And Reliability ◽  
Knee Alignment ◽  
Specialized Equipment ◽  
Healthy Participants

Abstract Objective Frontal plane knee alignment plays an integral role in tibiofemoral knee osteoarthritis development and progression. Accessible methods for obtaining direct or indirect measures of knee alignment may help inform clinical decision-making when specialized equipment is unavailable. The current study evaluated the concurrent validity, as well as intersession (within-rater) and interrater (within-session) reliability of smartphone inclinometry for measuring static frontal plane tibial alignment—a known proxy of frontal plane knee alignment. Methods Twenty healthy individuals and thirty-eight patients with knee osteoarthritis were measured for frontal plane tibial alignment by a pair of raters using smartphone inclinometry, manual inclinometry, and three-dimensional motion capture simultaneously. Healthy participants were measured on two separate days. Bland–Altman analysis, supplemented with ICC(2,k), was used to assess concurrent validity. ICC(2,k), standard error of measurement (SEM), and minimum detectable change with 95% confidence limits (MDC95) were used to assess measurement reliability. Results Compared against motion capture, smartphone inclinometry measured frontal plane tibial alignment with a mean difference of 0.7 and 1.1 degrees (biased towards varus) for healthy participants and participants with knee osteoarthritis, respectively [ICC(2,k) ≥ 0.87]. Smartphone inclinometry measurements demonstrated adequate intersession (within-rater) relative [ICC(2,k) = 0.91] and absolute (SEM = 0.7 degrees; MDC95 = 1.8 degrees ) reliability, which outperformed manual inclinometry [ICC(2,k) = 0.85; SEM = 1.0 degree; MDC95 = 2.6 degrees]. Interrater (within-session) reliability of smartphone inclinometry was acceptable in both cohorts [ICC(2,k) = 0.93; SEM = 0.4 degrees to 1.2 degrees; MDC95 = 1.2 degrees to 3.2 degrees]. Conclusions Smartphone inclinometry is sufficiently valid and reliable for measuring frontal plane tibial alignment in healthy individuals and patients with medial tibiofemoral knee osteoarthritis. Impact Smartphones are readily accessible by clinicians and researchers. Our assessment of measurement validity and reliability supports the use of smartphone inclinometry as a clinically available tool to measure frontal plane tibial alignment without medical imaging or specialized equipment.

scholarly journals Is the Landing Error Scoring System Reliable and Valid? A Systematic Review

2020 ◽  
Vol 12 (2) ◽  
pp. 181-188 ◽  
Author(s):  
Ivana Hanzlíková ◽  
Kim Hébert-Losier
Keyword(s):  
Lower Extremity ◽  
Predictive Validity ◽  
Motion Capture ◽  
Study Design ◽  
Scoring System ◽  
Motion Capture System ◽  
Lower Extremity Injuries ◽  
3 Dimensional ◽  
Jump Landing ◽  
Extremity Injuries

Context: The Landing Error Scoring System (LESS) is a clinical tool often used in research and practice to identify athletes presenting high injury-risk biomechanical patterns during a jump-landing task. Objective: To systematically review the literature addressing the psychometric properties of the LESS. Data Sources: Three electronic databases (PubMed, Web of Science, and Scopus) were searched on March 28, 2018, using the term “Landing Error Scoring System.” Study Selection: All studies using the LESS as main outcome measure and addressing its reliability, validity against motion capture system, and predictive validity were included. Original English-language studies published in peer-reviewed journals were reviewed. Studies using modified versions of the LESS were excluded. Study Design: Systematic literature review. Level of Evidence: Level 4. Data Extraction: Study design, population, LESS testing procedures, LESS scores, statistical analysis, and main results were extracted from studies using a standardized template. Results: Ten studies met inclusion criteria and were appraised using Newcastle-Ottawa Quality Assessment Scale adapted for cross-sectional studies. The overall LESS score demonstrated good-to-excellent intrarater (intraclass correlation coefficient [ICC], 0.82-0.99), interrater (ICC, 0.83-0.92), and intersession reliability (ICC, 0.81). The validity of the overall LESS score against 3-dimensional jump-landing biomechanics was good when individuals were divided into 4 quartiles based on LESS scores. The validity of individual LESS items versus 3-dimensional motion capture data was moderate-to-excellent for most of the items addressing key risk factors for anterior cruciate ligament (ACL) injury. The predictive value of the LESS for ACL and other noncontact lower-extremity injuries remains uncertain based on the current scientific evidence. Conclusion: The LESS is a reliable screening tool. However, further work is needed to improve the LESS validity against motion capture system and confirm its predictive validity for ACL and other noncontact lower-extremity injuries.

Motor Imagery Practice for Enhancing Elevé Performance Among Professional Dancers: A Pilot Study

2016 ◽  
Vol 31 (3) ◽  
pp. 132-139 ◽  
Author(s):  
Amit Abraham ◽  
Ayelet Dunsky ◽  
Ruth Dickstein
Keyword(s):  
Pilot Study ◽  
Motor Imagery ◽  
Motion Capture ◽  
Training Method ◽  
Post Intervention ◽  
Dance Movement ◽  
3 Dimensional ◽  
Dance Company ◽  
Professional Dance ◽  
Professional Dancers

OBJECTIVE: Eleve is a core dance movement requiring the greatest ankle plantarflexion (PF) range of motion (ROM). One possible way to enhance eleve performance is by using motor imagery practice (MIP). The aims of this pilot study were to investigate: 1) functional ankle PF maximal angles and ROM while performing eleve among professional dancers, 2) the effect of MIP on enhancing eleve performance, and 3) participants’ views on the MIP intervention and its feasibility in a professional dance company setting. METHODS: Five professional dancers, mean age 31 yrs (SD 1.87), participated in a 2-week MIP intervention. Data on ankle PF maximal angles and ROM were collected pre- and post-intervention using 3-dimensional motion capture while performing repeat (10 repetitions) and static (10 sec) eleve. RESULTS: At baseline, ankle PF maximal angles were 169.20° (SD 2.81°) and 168.36° (2.23°) and ankle PF ROM were 40.21° (3.35°) and 35.94° (3.95°) for the repeat and static tasks, respectively. After the MIP intervention, ankle PF maximal angles were 170.28° (4.26°) and 170.74° (3.77°) and ankle PF ROM were 41.53° (2.33°) and 39.30° (2.30°) for the repeat and static tasks, respectively. Feasibility of MIP was established with 100% compliance and positive views were expressed by participants. CONCLUSION: The results suggest MIP holds potential as an adjunct training method for enhancing elev. performance among professional dancers.

scholarly journals Dr. Richard C. Nelson: The Penn State Biomechanics Laboratory and Its Impact on My Career

2021 ◽  
Vol 37 (6) ◽  
pp. 596-600
Author(s):  
James S. Walton
Keyword(s):  
United States ◽  
Motion Capture ◽  
Doctoral Program ◽  
The United States ◽  
Human Motion ◽  
State University ◽  
Mathematical Foundation ◽  
3 Dimensional ◽  
Penn State ◽  
Unique Program

In 1967, as an undergraduate gymnast, I developed an interest in the mechanics of twisting somersaults. In 1969, after expressing a desire to measure and model human motion in a doctoral program, I was advised that Dr Richard “Dick” Nelson was starting a unique program in biomechanics of sport at Penn State University. In September 1970, I was the fourth or fifth doctoral student to join the new program. In 1972, I photographed a cluster of 18 golf balls hung from a 4′ × 8′ sheet of plywood in Dick’s new biomechanics laboratory. The question: “Could I create a 3-dimensional scale that would allow me to locate these golf balls in 3 dimensions?” From these early beginnings, I went on to develop the mathematical foundation for “motion capture” and a career as an entrepreneur and scientist working in a very wide variety of industrial environments in the United States and abroad. Much of my success can be traced back to the 4 years I spent on the Penn State campus. Dick’s efforts in the late 60s and his persistence in the early 70s, and later, were instrumental in creating a new discipline: “Biomechanics of Sport.” Dick: Thank you.

Validity and Intrarater Reliability of a 2-Dimensional Motion Analysis Using a Handheld Tablet Compared With Traditional 3-Dimensional Motion Analysis

2015 ◽  
Vol 24 (4) ◽  
Author(s):  
Barbara C. Belyea ◽  
Ethan Lewis ◽  
Zachary Gabor ◽  
Jill Jackson ◽  
Deborah L. King
Keyword(s):  
Lower Extremity ◽  
Motion Analysis ◽  
Motion Capture ◽  
Knee Flexion ◽  
Motion Capture System ◽  
3D Motion ◽  
3 Dimensional ◽  
Lower Extremity Alignment ◽  
Vertical Jumps ◽  
3D Motion Capture

Context: Lower-extremity landing mechanics have been implicated as a contributing factor in knee pain and injury, yet cost-effective and clinically accessible methods for evaluating movement mechanics are limited. The identification of valid, reliable, and readily accessible technology to assess lower-extremity alignment could be an important tool for clinicians, coaches, and strength and conditioning specialists. Objective: To examine the validity and reliability of using a handheld tablet and movement-analysis application (app) for assessing lower-extremity alignment during a drop vertical-jump task. Design: Concurrent validation. Setting: Laboratory. Participants: 22 healthy college-age subjects (11 women and 11 men, mean age 21 ± 1.4 y, mean height 1.73 ± 0.12 m, mean mass 71 ± 13 kg) with no lower-extremity pathology that prevented safe landing from a drop jump. Intervention: Subjects performed 6 drop vertical jumps that were recorded simultaneously using a 3-dimensional (3D) motion-capture system and a handheld tablet. Main Outcomes Measures: Angles on the tablet were calculated using a motion-analysis app and from the 3D motion-capture system using Visual 3D. Hip and knee angles were measured and compared between both systems. Results: Significant correlations between the tablet and 3D measures for select frontal- and sagittal-plane ranges of motion and angles at maximum knee flexion (MKF) ranged from r = .48 (P = .036) for frontal-plane knee angle at MKF to r = .77 (P < .001) for knee flexion at MKF. Conclusion: Results of this study suggest that a handheld tablet and app may be a reliable method for assessing select lower-extremity joint alignments during drop vertical jumps, but this technology should not be used to measure absolute joint angles. However, sports medicine specialists could use a handheld tablet to reliably record and evaluate lower-extremity movement patterns on the field or in the clinic.

Step-Down Task Identifies Differences in Ankle Biomechanics Across Functional Activities

2018 ◽  
Vol 39 (11) ◽  
pp. 846-852 ◽  
Author(s):  
Luke Donovan ◽  
Tyler Miklovic ◽  
Mark Feger
Keyword(s):  
Motion Capture ◽  
Frontal Plane ◽  
Binary Logistic Regression ◽  
Initial Contact ◽  
Posterior View ◽  
3 Dimensional ◽  
Jump Landing ◽  
Ankle Inversion ◽  
Lateral Group ◽  
Step Down

AbstractCurrently, there is no clinical exam to evaluate ankle frontal plane kinematics. The purpose of this study was to determine whether individuals identified as “lateral” landing during a video-recorded step-down task have differences in ankle inversion as measured with 3-dimensional motion capture during walking, step-down, and jump-landing tasks compared to individuals identified as “non-lateral”. Fifty-seven recreationally active adults completed the descriptive laboratory study. During walking, step-down, and jump-landing tasks, participants had their ankle frontal plane kinematics measured using a 3-dimensional motion capture system. In addition, during the step-down task, participants had a posterior view video of their foot recorded using a commercial camera. Following testing, a blinded-investigator scored the step-down video of all participants by classifying them as ”lateral” landing or ”non-lateral” landing. Ankle frontal plane kinematics during the walking, step-down, and jump-landing tasks were compared between the two groups (lateral (N=24) and non-lateral (N=33) using a binary logistic regression and time-series confidence interval analysis. During walking, stepping-down, and jump-landing, the lateral group had significantly more inversion at initial contact and during various other phases specific to each task. This study found that a clinical screening tool could identify individuals who have significantly more inversion during three tasks.

Batting Cage Performance of Wood and Nonwood Youth Baseball Bats

2014 ◽  
Vol 30 (2) ◽  
pp. 237-243 ◽  
Author(s):  
Joseph J. Crisco ◽  
Michael J. Rainbow ◽  
Joel B. Schwartz ◽  
Bethany J. Wilcox
Keyword(s):  
Motion Capture ◽  
Age Groups ◽  
Moment Of Inertia ◽  
Impact Speed ◽  
3 Dimensional ◽  
Youth Baseball ◽  
Bat Performance ◽  
Swing Speed ◽  
One Way Anova ◽  
Baseball Bats

The purpose of this study was to examine the batting cage performance of wood and nonwood baseball bats used at the youth level. Three wood and ten nonwood bats were swung by 22 male players (13 to 18 years old) in a batting cage equipped with a 3-dimensional motion capture (300 Hz) system. Batted ball speeds were compared using a one-way ANOVA and bat swing speeds were analyzed as a function of bat moment of inertia by linear regression. Batted ball speeds were significantly faster for three nonwood bat models (P< .001), significantly slower for one nonwood model, and not different for six nonwood bats when compared with wood bats. Bat impact speed significantly (P< .05) decreased with increasing bat moment of inertia for the 13-, 14-, and 15-year-old groups, but not for the other age groups. Ball-bat coefficients of restitution (BBCOR) for all nonwood were greater than for wood, but this factor alone did not correlate with bat performance. Our findings indicate that increases in BBCOR and swing speed were not associated with faster batted ball speeds for the bats studied whose moment of inertia was substantially less than that of a wood bat of similar length.

Sign in / Sign up

Export Citation Format

Share Document