[OANP-L] Responses to TF foot rotation issue

Rick

Description

Title:

[OANP-L] Responses to TF foot rotation issue

Creator:

Rick

Date:

2/7/2012

Text:

Original Question:
Good day Colleages,
I am having an issue w/a foot externally rotating upon heel strike only to return to its proper orientation as the foot moves to foot flat.  I have seen this before in a TF prosthetic users & corrected via heel durometer (of foot or shoe), but this fella is driving me crazy.  It also occurred in his old socket- a non-descript, round bucket w/no ischial or femural control. 

Gait is horrendous: 11 yrs of bad habits including aBduction, circumduction, hard knee extension/terminal impact, hard heel strike, long Px side step, very short, fast sound side step & very little wt shift over Px.  Single point cane used for balance;  Fwd trunk flxn w/slight Trendeleburg.  He's used an Otto Bock 3R92 & Trias+ foot for the last 3yrs.  Prior to that it was always Safety/wt activated knees & some sort of multiaxial foot.  His wt has been consistant, foot category is correct, all screws are tight & shoe heel not an issue.

Dynamic test socket is IC/narrow ML  w/very good lateral femural support.  Adductor tendon in its channel & A/P socket shape matches quads & hams.   Gel liner-locking pin suspension w/no socket rotation about residuum.  Residuum musculature is avg, subQ tissues moderate.  Flxn contracure ~8 degrees & limb hangs neutral aBd/aDd.  Hip abductors 5/5, adductors 4/5.  Hip flx/extn 5/5.

Using the Trais+ foot & various knee units (trialing to suit pt's needs).  Alignment is correct: no whips noted.  pt has been working w/a therapist for gait training- shows improvements during sessions & reverts to habits outside PT.  During PT, this jerking motion of the foot at heel strike deminishes w/improved gait.  Added a torsion adaptor at the ankle yesterday & saw improvements, but motion not completely gone.

Anything you can think of that I have not considered?   Replies posted & as always, much appreciated.
 
Thank you all.  I ended up shifting the knee & foot laterally via offset plate, plantarflexing the foot & slightly creating an medial leaning pylon.  This, along w/ PT has reduced the issue 90%.  Now it is most notable when pt increases velocity significantly- creating a very hard heel strike & returning to all bad habits.  Of note: pt refused trying seal-in liner & will ...never use a belt. 

Citation

Rick, “[OANP-L] Responses to TF foot rotation issue,” Digital Resource Foundation for Orthotics and Prosthetics, accessed November 24, 2024, https://library.drfop.org/items/show/233429.