Objective: The purpose of this study was to compare a markerless motion capture system to the “gold standard” Vicon marker-based system.
These results indicate that there is no statistical difference in the sagittal or coronal planes, and a strong correlation in the transverse.
Conclusion: Kinematics are sufficiently accurate for clinical use!
Notre Dame and DARI have been working hard together for the last 4 years in both academics and athletics! Go Irish!
At DARI, we just want to say thank you to Notre Dame for being a leader in MSK health in performance!
In biomechanical data, there are a variety of devices to help track human movement. The two that are most common are motion capture and force plates. Motion capture tracks the kinematic variables of human movement, like distances and angles, and force plates track the kinetic variables of human movement, like force.
DARI has a patented way to collect both kinematic and kinetic data with only motion capture technology!
This is done through forward simulation modeling using the tracking position of body segments and mass distribution techniques. This, culminated with the appropriate filter technique, makes this open kinetic force model possible.
DARI has validated their model against force plates and has shown no significant difference in force magnitudes. Utilizing this model, DARI offers synchronized kinematics and kinetics for human movement and adops standardized inverse dynamic models for joint torques.
A movement review is an excellent touch point to see exactly what DARI can collect and to better understand its importance in your motion health!
The forward lunge is a simple movement that requires good mobility and strength from both lower limbs. There are several variables that can be assessed during a forward lunge that make it a good functional movement. At DARI, we are very strategic in how we present data and forward lunge data is no exception! Check out below for some unique data points we present.
1- Stride length and stride length as a percentage of the lower body – a good indicator of mobility at the hips, knees, and ankles. At DARI, we recognize that not all body sizes and shapes are able to hit the same static measurements, however, if we account for limb length by representing stride length as a percentage of the lower limb length, now all numbers are normalized to each unique individual.
2- Total knee medial/lateral displacement during contact – did that knee wobble while in the lunge and show a lack of control and stability?
3- Contralateral hip extension – is the back leg limiting the potential stride length by not extending?
Breaking down the movement genome to better determine what is needed to track and build better athletes.
Traditionally, motion capture was used to breakdown complicated movement patterns like throwing, swinging, or running. The idea focused on the speed of movement mixed with the evaluation, which was not easily done. Later on, motion capture systems started being used for functional movements. This application became relevant based on the value scientists were finding with the complex movement patterns. The human eye and subjective evaluation can miss a lot of movement data and the results can be bias towards the user. This aspect made motion capture technology more appealing.
When trying to decide whether or not you should be capturing sport specific movements or functional movements you should focus on an 80/20 breakdown. 80% of the captured movements should be functional movements. The focus for this is based on compliance, time, and scientific repeatability. You should be able to screen more people quickly and identify impactful differences in motion health more reliability. Around 20% of your testing should be sport specific to follow the functional changes and how they manifest into sport specific changes. Collect a baseline test and follow up tests for sport specific movements as needed, which keeps the sport specific compliance and effort high.
A movement review is an excellent touch point to see exactly what DARI can collect and to better understand its importance in your motion health!
The lateral bound is one of the most complex movements in a screen. Let’s review why it is so complex and why it is needed in your movement screen.
1- The dynamic nature of the movement stresses the body in multiple planes. This will identify a weak link if it exists, better than a sagittal plane movement.
2- Lower body injuries (especially at the knee) often occur during this style of movement. The more you can control and move appropriately through this movement, it will result in lowering your injury risk.
3- Confidence is the key to movement success. Working through this complex movement in a controlled setting will help set the stage for a confident return to sport or activity.
Lateral bound is a movement we should all include in our movement screening!
Inside Healthcare, we all know that as we age our physical dexterity also diminishes. Understanding just how much we change as we age is unknown due to the amount of data needed to determine that change.
To help answer this, variables that DARI tracks regarding the ‘What’ and the ‘How’ of human movement have also been cataloged in a variety of ways for better analysis. One of which is based on a person’s chronological age.
Age Rating is when any metric is compared to a specific chronological age database or normative expectations. This categorization is often simple and linear in its definition, and easy to communicate. Thus “Motion Age” is translating the given metric to a corresponding age represented in population age expectations.
Take a peek at how low back pain rehabilitation looks like with DARI Health. Review how the reporting ecosystem works to easily help the healthcare provider document and track the patient’s progression.
Baseline Screen: non-surgical, 5 movements = 2 mins testing time
The patient is experiencing pain during movement and is showcasing restricted range of motion (mobility). Primary plane joint impairment is 88%. These restrictions have reduced the patient’s ability to complete activities of daily living related to sitting and locomotion. Therapeutic interventions have been implemented to initially improve overall range of motion (mobility). A brace should be used for the next 4 weeks when not performing therapy exercises.
Click to download the entire case study…
Low Back Rehab Progression Analysis
Download PDF • 846KB
For more on DARI’s rehabilitation application:
https://www.darimotion.com/rehabilitation
In this post we will show a video for a straightforward visualization of how we communicate results. It demonstrates exactly how much data DARI has and how we make that data more meaningful for you.
DARI data represents the strength of the system and the data models represent the value! Together we have the best in-class system for human tracking.
