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Mass Moment of Inertia and a Merry go round
Newton's 2nd law of Acceleration also applies to rotational force (torque) and rotational acceleration. When applied to rotational acceleration, Newton's second law is:
Torque = Mass Moment of Inertia x Rotational Acceleration (T = I × α).
Mass moment of inertia is what makes a merry-go-round accelerate when the people on it move closer to the middle (the axis of rotation). When the people move closer to the middle, the Mass Moment of Inertia decreases, and as a result the Rotational Acceleration increases.
Torque = Mass Moment of Inertia x Rotational Acceleration (T = I × α).
Mass moment of inertia is what makes a merry-go-round accelerate when the people on it move closer to the middle (the axis of rotation). When the people move closer to the middle, the Mass Moment of Inertia decreases, and as a result the Rotational Acceleration increases.
zhlédnutí: 20
Video
Therapeutic Electrical Modalities Overview - The Basics
zhlédnutí 576Před 9 měsíci
The foundational theoretical background of electrical stimulation of afferent and efferent peripheral nerves. • Electrical Current • Types of Current • Waveforms • Modulation • Action Potentials • TENS • NMES • Iontophoresis • Electrode Placement • Precautions and contraindications • sEMG biofeedback
Trigger Finger Visual Presentation
zhlédnutí 67Před 9 měsíci
A Patel Stage 4 nodular trigger finger looks like this
Thumb CMC Joint Palpation for Osteoarthritis (OA)
zhlédnutí 555Před 10 měsíci
Test Procedure: Support the patient’s hand with one hand. With your other hand, locate the CMC joint line on the volar surface (typically just distal & radial to the bottom curve of the thenar crease), and then press firmly with your thumb on the volar surface of the thumb CMC joint line. Positive results: - Pt. reports pain/tenderness (at CMC joint) with firm pressure Negative Results: - No ch...
Grind Test for Thumb Carpometacarpal (CMC) Joint Osteoarthritis
zhlédnutí 318Před 10 měsíci
Test Procedure: - Support the patient’s hand with one hand, and with the other hand grasp the thumb metacarpal. Axially compress the CMC joint while rotating the metacarpal around its long axis and/or circumducting it. Positive results: - Pt. reports pain and/or crepitus (at CMC joint) with this maneuver Negative Results: - No change in pain Implications of positive test result: - Thumb CMC joi...
Thumb MCP joint lateral stability test
zhlédnutí 1KPřed 10 měsíci
Test Procedure: - Stabilize the thumb metacarpal with one hand, and with the other hand grasp the thumb proximal phalanx. With the MP joint in 0° extension, gently push the proximal phalanx in an ulnar direction and then a radial direction. Repeat the test with the MP joint in 30° flexion. Positive results: Passive lateral deviation greater than 35 degrees Passive lateral deviation 15 degrees m...
Neer Impingement Test (Passive version)
zhlédnutí 203Před 10 měsíci
Neer impingement test Test Procedure: • Active Test: Examiner stabilizes scapula and client actively flexes the GH joint until onset of pain or full flexion • Passive Test: Examiner forces client’s internally rotated arm into maximal flexion Positive results: • Shoulder pain Negative Results: • No shoulder pain Implications of positive test result: • Subacromial impingement Psychometric Propert...
Speeds Test for Long Head of the Biceps Tendinopathy
zhlédnutí 141Před 10 měsíci
Speed’s test (for bicipital tendinopathy) Test Procedure: • Client actively flexes GH joint to 90°, elbow extended, forearm supinated. Examiner resists flexion, applying pressure to the distal forearm. Positive results: • Pain in the bicipital groove Negative Results: • No pain Implications of positive test result: • SLAP lesion or bicipital tendinopathy Psychometric Properties for LH biceps te...
Full Can Test
zhlédnutí 161Před 10 měsíci
Full can test for supraspinatus tendinopathy Test Procedure: • Client elevates arms in the scapular plane (30° anterior to frontal plane) to 90° with GH ER; examiner applies downward resistance. Positive results: • Weakness Negative Results: • No weakness Implications of positive test result: • Supraspinatus tendinopathy Psychometric Properties for supraspinatus tear: (Cleland et al., 2022) p. ...
Finkelstein's Test for deQuervain's tenosynovitis
zhlédnutí 120Před 10 měsíci
Test Procedure: - Have patient grasp thumb in a fist and ulnarly deviate wrist (or examiner can assist). Positive results: - Pain (often exquisite) in the 1st dorsal compartment. Always compare with the uninvolved side, as this position can be somewhat uncomfortable in normal individuals. Negative Results: - No difference between arms (if only one arm is involved) or no sharp pain. Implications...
Stressed Grip Test for tennis elbow, golfer's elbow (epicondylitis, epicondylosis)
zhlédnutí 383Před 10 měsíci
Be sure to ask about how it felt after *each* repetition, and if they had pain, *where* the pain was located. Test Procedure: - Take bilateral grip measurements in standard position - Re-take bilateral measurements in stressed position: - Tennis elbow-shoulder flexed to 90° with elbow extended, and forearm pronated - Golfer’s elbow-shoulder flexed to 90° with elbow extended, and forearm supinat...
Golfer's Elbow Resisted Test (Resisted FCR test)
zhlédnutí 135Před 10 měsíci
Test Procedure: - With the patient’s supinated, the examiner resists active wrist flexion/radial deviation. Positive results: - Pain at medial epicondyle Negative Results: - No pain at medial epicondyle Implications of positive test result: - Golfer’s elbow
Cozen's Test (Tennis Elbow Resisted Test)
zhlédnutí 163Před 10 měsíci
Test Procedure: - With the patient’s elbow in near full extension and full pronation and making a fist, the examiner resists active wrist extension/radial deviation. Positive results: - Pain at lateral epicondyle Negative Results: - No pain at lateral epicondyle; pain in extensor muscle bellies indicates Radial tunnel Implications of positive test result: - Tennis elbow
Elbow Flexion Test
zhlédnutí 151Před 10 měsíci
Elbow flexion test Test Procedure: • Therapist holds the client’s elbow passively flexed and supinated for 60 seconds (wrist neutral) (Some add wrist extension to increase the sensitivity of the test, but this would decrease the specificity as it would also compress the ulnar nerve at Guyon’s canal, and compress the median nerve in the carpal tunnel.) Positive results: • Increased paresthesia (...
Cyriax Release Test for Thoracic Outlet Syndrome (neurogenic disputed type)
zhlédnutí 168Před 10 měsíci
Cyriax Release Test for Thoracic Outlet Syndrome (neurogenic disputed type)
Cervical spine screening with AROM to check for radiculopathy
zhlédnutí 124Před 10 měsíci
Cervical spine screening with AROM to check for radiculopathy
Torque Concepts Applied to Levers and the Human Body
zhlédnutí 463Před 11 měsíci
Torque Concepts Applied to Levers and the Human Body
Glenohumeral Joint Arthrokinematics (videofluoroscopy)
zhlédnutí 242Před 11 měsíci
Glenohumeral Joint Arthrokinematics (videofluoroscopy)
The Convex Concave Rule and Glenohumeral Joint Arthrokinematics
zhlédnutí 5KPřed 11 měsíci
The Convex Concave Rule and Glenohumeral Joint Arthrokinematics
Passive Insufficiency vs Joint Tightness
zhlédnutí 149Před 11 měsíci
Passive Insufficiency vs Joint Tightness
Concentric, eccentric, and isometric muscle activation applied to real life
zhlédnutí 71Před 11 měsíci
Concentric, eccentric, and isometric muscle activation applied to real life
Hello, I am unable to bend both my thumbs at the MP joint. Its by birth and my father and my son has the same problem. Seems like this is a deformity and genetically transmitted. Could you please let me know what is this deformity called. We dont have any pain in any of the thumb.
This video clearly able to understand for me TQ sir
Fantastic video - and with the help of a sound engineer, it would immensely boost views. Brilliant video, thank you for posting 🙏🏻
Simple but excellently delivered!
I've given myself frostbite and now I recommend setting a timer for 4 minutes. Still very effective!
Just wanted to say you saved someone on the other side of world
❤❤
So much knowledge, thank you sir
سبحان الله القاعدة العلمية اصبحت منطقية للعقل بسبب شرح بسيط بدون اى تعقيد Praise be to Allah, scientific rule has made sense to the mind because of a simple explanation without any complexity
Thank you, sir! I have been suffering from this convex-concave rule for hours, and after your presentation, I realized that I first confused rotation with rolling, and secondly, I misunderstood the law as "rolling and sliding in the opposite direction of the convex skeleton at the same time". Your demonstration and explanation were very, very clear and comprehensive! Most of them use shoulder abduction as an example, whereas what I would like to see most is shoulder flexion, because the AI gives very different conclusions, and the web search doesn't explain it exactly. All in all thank you!
Watched so many videos prior to this, most simplistic explanation thank you so much ! Great
Thank u for sharing this video. It helped me a lot.
best video on these curves. Can be applied to heart preload and afterload too
A better place to look at when doing this test is the fingernails. Everyone, regardless of skin pigment, generally has similar fingernail colors, and it's more obvious when something is off.
Like how you explained it very clear
Thannnnkkkkk uuuu so much this is so helpful ❤❤
I took a video of my back between the shoulder blades... I held a stretch band out Infront of me whilst stretching my arms out to the sides, so I can see what's going on between my shoulder blades as I stretch them out with resistance band... ( Because it feels like my arm is hanging off weirdly all the time... ) When I watched the video back , my left muscles around the blade look different to the right . They left are not even they don't move together in the same way... I also have trouble shrugging the shoulder to the ear.. and it feels like my shoulders hanging off all the time... Does this sound like rhomboid.. When it first happened it was really bad.. sometimes the only thing I can do is the stratetch band exercise holding palms down
Love how slow you explained the concept! Thanks!
What is pulse width in this machine ? I am looking 1ms. I need mode where frequency is a range(70-100-70),
Please how to switch to the ch2 ? Alternative option??
Hi, I'm from Iran and study biomechanics. I'm pretty confused with the movement of the scapula Thanks for assisting me
Watched 2 other videos before this and still didn't understand until I found this one! Thank you so much!
I have radial nerve damage as well as the other nerves from a humerus fracture i was in a near fatal accident. I have a occupational therapist who has looked into this and we started using this treatment as well as others. However, my wrist hadn't moved in any position. It does the opposite a few months into therapy. I've been slowly regaining the use.
have you figerd out how to move it ? I have the same exact question as you
Best video regarding end feel👍
Thank you
i watched 10 videos on active passive tension before this one, couldn't understand a thing. After this video, i don't think i have to watch any other. best explanation possible.
Thank you so much, that was some awesome explanation!
Very helpful, thank you.
Can ultrasonud be applied to cervical area if patient has a pacemaker?
You’re the best Thank you I finally understood
Buna ziua cit costa
Thank you for making this video I could understand it well
How can someone obtain a prosthetic arm simulator like this one
Thx
Thank you from Kashmir (India)
How much tension would you put on a post-op hand? If you couldn’t move the patient in full ROM but still have major oedema that won’t go away with usual compression method?
Can this be used for lymphedema in the hands? Thank you.
Met papier parchemin autour main au lieu plastique puis là le gant
Le premier en gris compte pour deux
how can i build that scapulohumeral model?
Nicew video! What text do you use for your class?
Hello, Dr.Borst. I am an OT from Turkey. Thank you for sharing videos. I'll watch all of them and take them notes.
Thank you, Dr.Borst. Greetings from Turkey!
Good
Thank you Doc! I fell asleep at my class, your video helps me understand so easily!
Do you have a video on Empi Select older model I cannot get it strong enough for my lower back pain… highest it goes is 60, usually works, not tonight.
thank you for this!
I’m so glad I found this. I‘ve had chronically tight lumbar muscles for years. Will this work to release them? If so what’s the general range? Thank you. I need help desperately as I have such limited range of motion.
I used a Cheater bar today to break loose a bolt and realized I did not understand the math on how MA worked. Your video cleared it up perfect. I can now move forward in life...
Hello, Thanks for posting this video. I am unable to bend both my thumbs at the MP joint since birth. My father has the same problem. Could you please let me know the name of the deformity.
Hello! There are a lot of people that have very limited thumb MCP joint motion; they typically make up for that with a hypermobile IP joint. Thumbs tend to be inconsistent that way Some people have a lot of MCP motion and limited IP motion, while others have limited MCP motion and a lot of IP motion. Do you have very limited MCP motion, or do you really have no motion (like it is fused)?
@@Dr.B_OT Hey, I dont have any mcp motion, like it is fused. My IP joint and CMC joints seems to be fine and all activities are performed by them. I am unable to bend the MP joint and its genetic as my father has the sane problem
Hi , Can you please respond to