"KNOWLEDGE-BASED FITNESS"
Showing posts with label gait. Show all posts
Showing posts with label gait. Show all posts

Sunday, February 21, 2016

Which Hand Should I Hold My Cane In?

Which Hand Should I Hold My Cane In?

If you are working with a client who is learning how to walk with a cane because of weakness/instability in one of their legs, it is adviseable to have them use the cane in the hand on the opposite side of their weaker or more "troublesome" leg.  

Although a cane is not to be used as a weight bearing device, as it is strictly for balance, holding the cane in the opposite hand will be more energy efficient for a client.  The reason is similar to the last post, which described the unilateral Farmer's Carry, a very useful exercise that strengthens the hip musculature particularly on the side opposite of the side carrying the weight.  

It all deals with Moment Arms, which are defined as the length between the axis of a joint (your hip in this example), and the line of force acting on that joint....kind of like a lever.  The line of force can be a weight, as in the Farmer's Carry, or a cane which provides a supportive force rather than a resistive force.   In terms of resistance, think about holding a weight with both hands at your chest.  Then hold that weight with your arms stretched out in front of you (lengthen the lever).  The longer the lever or moment arm, the more the resistance, and the harder the task feels.  On the other hand, when using an assistive device rather than a resistive device, the longer the lever (moment arm), the more assisted or easier the activity is.  

In regards to the Farmer's Carry, as described in the previous post, as a weight is carried in the left hand while walking, each time you stand on the right leg during gait, the right hip and trunk muscles have to work even harder to maintain stability due to the force applied by the weight on the opposite side.  If you carried the weight in the right hand instead, the right hip and trunk would not have to work as hard when in right single leg stance due to the shorter moment arm.  

In terms of a supportive device, holding the device (cane) in the hand further away from the weak joint will assist that joint in stability more than if the cane is held in the hand on the same side as the weaker leg.  This is because the Moment Arm is longer from the weak hip joint to the opposite hand than it is to the same side hand.  This is seen by the blue arrow on the picture below.  


Figure 1                                                          Figure 2

You can see that the Moment Arm is much shorter in figure 1 than it is in figure 2.  Holding the cane in the left hand provides more assistance to the right hip than it does to the left hip as a result.  Therefore, if you have trouble with your right hip and your balance is impaired because of it, try holding the cane in the left hand.  If the problem is your left hip, hold the cane in your right hand.  

This is also the reason why I progress my patients in the Single Leg Stance (SLS) activity described in the previous post from holding a support with 2 hands, to holding the support with the hand opposite the leg they are standing on, followed by SLS holding on with the same side hand, finally to SLS without holding onto a support.  When in SLS on the right leg, holding the kitchen counter with your left hand makes the task easier than holding the sink with the right hand.  

Keep these tips in  mind when training gait, balance, and hip stability.      

Thursday, December 12, 2013

Rehab Devices That Make Life Easier

Rehab Devices That Make Life Easier:
Canes

During Physical Therapy assessments, patients and their family members ask me for advice on which type of device they should use to walk safely.  In regards to canes, the most common are the straight cane and the quad cane.
STRAIGHT CANE

QUAD CANE
The main differences between these two types of canes are that the Straight Cane is used mainly for people with balance deficits, while the Quad Cane assists with balance deficits and lower extremity weakness and instability.  The straight cane should only be prescribed to a patient who has slight balance deficit and needs just a little extra support (wider base of support) when walking.  The straight cane is not a weight bearing device, so if your patient or family member seems to be pressing heavily down on the cane when walking in order to safely navigate their environment, the straight cane is not the appropriate device.  

The Quad Cane is a weight bearing device.  Many people recovering from stroke present with one-sided weakness and benefit from this type of cane in order to prevent buckling of their knee.  The only con is that all four legs of the quad cane must be placed on the floor/ground at the same time in order to be safe.  You should not walk and place the back two legs on the ground, followed by the front two legs of the Quad Cane.  It is sometimes more difficult to coordinate this action, and many times patients will trip over the Quad Cane.  

Take home message: A straight cane is only for people with slight balance issues while a Quad Cane assists with balance and weight bearing (supports the weak leg).