considering an Analysis of the gait in Patients with Hip Spacers and
walking with crutches, the Ground Reaction Force is reduced on the
affected limb to 30-50% of body weight - sharing the remaining weight
equally to both crutches. The sound limb showed ground reaction
forces in the normal range.
The frontal moments around the affected hip are reduced to nearly
zero.
To get a estimation of the hip and muscles forces during gait with
walking on crutches, is it accurate to use the Gait3D model or the
VaughanGait model with reduced Force Plate Data and Moment Plate Data
on the affected leg or do I have to change more on the model?
The result of the resultant hip force (on the affected leg) by doing
so is about 1400 N (by running the original Vaughan Gait model, the
max. hip forces are 3173 N) and seems reasonable.
Or do I have to add the residual forces of the crutches on both hands?
How is the model balanced with a reduced GRF? Is it grounded on the
pelvis as the FreePostureMove Model?
If so, where can I find the Reaction force on the pelvis which
grounds the residuals?
I do not know how different the measured reactions forces will be due to the
crutches, so I am not sure this approach will work ok.
How do you know how small a fraction the load should be of the original
load?
The model is balanced by reactions between the pelvis and the environment,
so it will not feel the load from the crutches, in any other way than the
force measured on the leg is reduced.
You can find the definition of the reactions between the pelvis and the
environment in the to of the JointAndDriver.any file.
considering an Analysis of the gait in Patients with Hip Spacers and
walking with crutches, the Ground Reaction Force is reduced on the
affected limb to 30-50% of body weight - sharing the remaining weight
equally to both crutches. The sound limb showed ground reaction
forces in the normal range.
The frontal moments around the affected hip are reduced to nearly
zero.
To get a estimation of the hip and muscles forces during gait with
walking on crutches, is it accurate to use the Gait3D model or the
VaughanGait model with reduced Force Plate Data and Moment Plate Data
on the affected leg or do I have to change more on the model?
The result of the resultant hip force (on the affected leg) by doing
so is about 1400 N (by running the original Vaughan Gait model, the
max. hip forces are 3173 N) and seems reasonable.
Or do I have to add the residual forces of the crutches on both hands?
How is the model balanced with a reduced GRF? Is it grounded on the
pelvis as the FreePostureMove Model?
If so, where can I find the Reaction force on the pelvis which
grounds the residuals?
Thank you
Best regards
Thomas
[Non-text portions of this message have been removed]
There is a paper about measured GRF during gait when walking by means
of crutches (Analysis of the gait in patients with hip spacers;
Romano et al. 2006).
Of course by using these measured GRF in the gait model, the results
will only approximate the real forces in the hip joint, as the
changed kinematic data are not yet considered.
But, if the gait model is mainly influenced by the ground reaction
forces, the reduced GRForces should then lead to a first approximated
solution?
Best regards
Thomas
— In anyscript@yahoogroups.com, AnyScript Support
<anyscriptsup@…> wrote:
>
> Hi Thomas
>
>
>
> I do not know how different the measured reactions forces will be
due to the
> crutches, so I am not sure this approach will work ok.
>
>
>
> How do you know how small a fraction the load should be of the
original
> load?
>
>
>
> The model is balanced by reactions between the pelvis and the
environment,
> so it will not feel the load from the crutches, in any other way
than the
> force measured on the leg is reduced.
>
>
>
> You can find the definition of the reactions between the pelvis and
the
> environment in the to of the JointAndDriver.any file.
>
>
>
>
>
> Best regards
>
> Søren, AnyBody Support
>
>
>
> _____
>
> From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com]
On Behalf
> Of knox40
> Sent: 13 February 2009 08:38
> To: anyscript@yahoogroups.com
> Subject: [AnyScript] Gait application with reduced GRF
>
>
>
> Hi,
>
> considering an Analysis of the gait in Patients with Hip Spacers
and
> walking with crutches, the Ground Reaction Force is reduced on the
> affected limb to 30-50% of body weight - sharing the remaining
weight
> equally to both crutches. The sound limb showed ground reaction
> forces in the normal range.
>
> The frontal moments around the affected hip are reduced to nearly
> zero.
>
> To get a estimation of the hip and muscles forces during gait with
> walking on crutches, is it accurate to use the Gait3D model or the
> VaughanGait model with reduced Force Plate Data and Moment Plate
Data
> on the affected leg or do I have to change more on the model?
> The result of the resultant hip force (on the affected leg) by
doing
> so is about 1400 N (by running the original Vaughan Gait model, the
> max. hip forces are 3173 N) and seems reasonable.
>
> Or do I have to add the residual forces of the crutches on both
hands?
>
> How is the model balanced with a reduced GRF? Is it grounded on the
> pelvis as the FreePostureMove Model?
>
> If so, where can I find the Reaction force on the pelvis which
> grounds the residuals?
>
> Thank you
>
> Best regards
>
> Thomas
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
It may work out ok; it is difficult for me to say.
I think it will be important to look into the pattern and timing of the GRF,
does this look similar to normal gait in terms of shape, in all directions?
Then it might be ok…
There is a paper about measured GRF during gait when walking by means
of crutches (Analysis of the gait in patients with hip spacers;
Romano et al. 2006).
Of course by using these measured GRF in the gait model, the results
will only approximate the real forces in the hip joint, as the
changed kinematic data are not yet considered.
But, if the gait model is mainly influenced by the ground reaction
forces, the reduced GRForces should then lead to a first approximated
solution?
Best regards
Thomas
— In anyscript@yahoogrou <mailto:anyscript%40yahoogroups.com> ps.com,
AnyScript Support
<anyscriptsup@…> wrote:
>
> Hi Thomas
>
>
>
> I do not know how different the measured reactions forces will be
due to the
> crutches, so I am not sure this approach will work ok.
>
>
>
> How do you know how small a fraction the load should be of the
original
> load?
>
>
>
> The model is balanced by reactions between the pelvis and the
environment,
> so it will not feel the load from the crutches, in any other way
than the
> force measured on the leg is reduced.
>
>
>
> You can find the definition of the reactions between the pelvis and
the
> environment in the to of the JointAndDriver.any file.
>
>
>
>
>
> Best regards
>
> Søren, AnyBody Support
>
>
>
> _____
>
> From: anyscript@yahoogrou <mailto:anyscript%40yahoogroups.com> ps.com
[mailto:anyscript@yahoogrou <mailto:anyscript%40yahoogroups.com> ps.com]
On Behalf
> Of knox40
> Sent: 13 February 2009 08:38
> To: anyscript@yahoogrou <mailto:anyscript%40yahoogroups.com> ps.com
> Subject: [AnyScript] Gait application with reduced GRF
>
>
>
> Hi,
>
> considering an Analysis of the gait in Patients with Hip Spacers
and
> walking with crutches, the Ground Reaction Force is reduced on the
> affected limb to 30-50% of body weight - sharing the remaining
weight
> equally to both crutches. The sound limb showed ground reaction
> forces in the normal range.
>
> The frontal moments around the affected hip are reduced to nearly
> zero.
>
> To get a estimation of the hip and muscles forces during gait with
> walking on crutches, is it accurate to use the Gait3D model or the
> VaughanGait model with reduced Force Plate Data and Moment Plate
Data
> on the affected leg or do I have to change more on the model?
> The result of the resultant hip force (on the affected leg) by
doing
> so is about 1400 N (by running the original Vaughan Gait model, the
> max. hip forces are 3173 N) and seems reasonable.
>
> Or do I have to add the residual forces of the crutches on both
hands?
>
> How is the model balanced with a reduced GRF? Is it grounded on the
> pelvis as the FreePostureMove Model?
>
> If so, where can I find the Reaction force on the pelvis which
> grounds the residuals?
>
> Thank you
>
> Best regards
>
> Thomas
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
[Non-text portions of this message have been removed]