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Closed-Chain Foot Adduction

1/29/2013

2 Comments

 
Posterior tibialis tendonopathy can be tricky to treat sometimes.  There are many different theories to the causes of PTT.  However, what we do know is some of the signs of posterior tibial tendon dysfunction which can include: increased heal valgus, PF of the talus, flattening of the medial longitudinal arch, and abduction of the forefoot.  While we won't go into the examination of the posterior tibial tendon dysfunction or tendinopathy in this post, we will go over the functions of the posterior tibialis.  
The tendon is posterior to ankle axis and medial to the STJ axis which makes it a plantarflexor and invertor.  Additionally, it directly opposes the action of the peroneus brevis muscle by acting as an adductor of the forefoot.  It is the primary dynamic stabilizer of the medial longitudinal arch.  
The closed chain foot adduction exercise is one of the more effective ways of strengthening the posterior tibialis.  In 2004, Kulig, et al. conducted a study using magnetic resonance transaxial imaging to find the signal intensity of the posterior tibialis muscle during 3 exercises (closed chain foot adduction, unilat. heel raise, and open chain foot supination).  What they discovered was that in individuals with a normal arch index, the posterior tibialis was most activated during closed chain foot adduction when compared to the other two exercises mentioned above.  
To perform this exercise, place a theraband around the leg of a table/therapy plinth and the patient's foot.  Instruct them to keep their foot on the ground throughout the exercise.  Teach them to perform foot adduction.  Be sure to look for substitutions as they are often common when prescribing this exercise.  
2 Comments
matt johns
1/29/2013 09:42:19 am

this isn't closed chain..

Reply
Brian
1/29/2013 11:17:19 am

I can see what you mean if you want to take the definition at face value. The author in the study called it closed chain and I felt it was appropriate to keep the exercise name consistent with the study to which was published.
Thanks for the comment. Hope that clarifies why I didn't stress over changing the name.

Reply



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