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The Biomechanics of Mobs
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The Biomechanics of Mobs - March 19, 2001 4:13:00 AM
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mcap
Posts: 652
Joined: February 8, 2000
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Group:
For some of the "manual therapists" out there:
How do joint mobs adhere to the priniciples of biomechanics?
If you look at soft tissues such as fibrocartilege, when a load is applied there is a load elongation curve. Most loads fall within the elastic region. In this region, the deformation is not permanent. Occaisionally, if the loads are high enough you will reach the Plin point. Higher loads cause plastic deformation in which the elongation is permanent.
Here is the question: I would imagine that the loads applied during mobs cause elastic deformation and therefore would be incapable of inducing permanent change. If the loads were high enough to cause plastic deformation, then you would be damaging the tissues.
For the experienced manual folks out there - share some insights.
mcap
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Re: The Biomechanics of Mobs - March 22, 2001 5:16:00 AM
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drwatson911
Posts: 1
Joined: March 21, 2001
From: winston-salem
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You are correct about the elastic zone of stretching. Your assumption of entering the plastic zone causing permanent damage is where the confusion lies. Yes entering the plastic zone does technically damage tissue. However when tissue is pathologically shortened, this is the only mechanical means of elongating it. Stretching in the elastic zone will not do the trick (by mechanical means, although you may experience a sense of lengthening via neurophysiological mechanisms). In fact, remembering Wolf's Law of tissue remodeling, your shortened tissue may serve to reinforce its shortened barrier by only stretching into the elastic zone.
The bottome line: for a mob to be effective at lengthening tissue it must enter the plastic zone.
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Re: The Biomechanics of Mobs - March 22, 2001 7:11:00 PM
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Betty Smoot
Posts: 49
Joined: March 1, 2000
From: Sonoma CA
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My 2 cents:
Joint mobs used for increasing range due to capsular or periarticular shortening need to be sustained and of sufficient force to do the job, as you indicate.
Joint mobs to increase range due to pain or guarding probably act on a neurophysiological mechanism. However knowledge of biomechanics is important with regard to positioning (closed versus open pack)and proper direction of forces applied to avoid irritation of vulnerable structures.
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Re: The Biomechanics of Mobs - March 22, 2001 8:49:00 PM
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edilling
Posts: 139
Joined: January 10, 2000
From: pullman,wa,usa
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Joint mobs are most often performed on pathalogical tissue, not normal tissue. A joint which is exhibiting capsular restriction may be due to traumatic scaring, adhesive folds or inflammation.
As for inflammation, movement is key and force is contra-indicated (pain prior to restriction).
Scar tissue in it's young state is held together by weak hydrogen bonds. These are easily broken when stressed. As the scar matures the H-bonds are replaced by much stronger covalent bonds. These are very difficult to break as indicated by the load elongation curve you spoke about.
Traumatic scarring and adhesive folds in the capsule are influenced by joint mobilization because these techniques can break the H-bonds and thereby affect remodeling.
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Re: The Biomechanics of Mobs - March 23, 2001 7:51:00 AM
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mcap
Posts: 652
Joined: February 8, 2000
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Edilling:
I agree completely......here is the question.....is your in-office remodelling stress adequate or is it mostly a function of the HEP??????
mcap
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