Hi all,
I have a specific question for performing a biomechanical test using a quasi-static machine on a hemipelvis. I have read many papers about biomechanical testing of the hemipelvis and I have found many discrepancies among all. Whilst many claim to emulate this activity, by looking at their published images and rotating angles descriptions in the paper document, they seem to differ.
Hence , I will really appreciate some guidance on this matter. Here are some examples of information found:
Case 1:
- Rotation of hemipelvis superomedially by 45 degrees
- Rotation of hemipelvis posteriorly by 15-25 degrees (To place hemipelvis in neutral position)
Case 2:
- Force vector at 25 degrees from vertical directed medially
- Force vector ar 20 degrees from medial directed posteriorly
Case 3:
- Alignment to allow a Joint Contact Force in 12 degrees of adduction
Case 4:
- Line between iliac crest parallel to floor in frontal plane.
-Femoral shaft at 13 degrees of abduction in frontal plane and vertical in sagittal plane.
-Proximal femur oriented 5-10 degrees rotated internally
All this producing a Joint Reaction Force Vector of 25 degrees directed medially inclined from femoral shaft in frontal plane and parallel to femoral shaft in sagittal plane.
Case 5:
- Line between iliac crest is 25 degrees to the floor towards the contralateral side in frontal plane and 35 degrees anteriorly in the sagittal plane.
This was done by using a line conecting anterosuperior and posterosuperior iliac spines that was aligned 55 degrees to the horizontal.
All of this produce a Joint Reaction Force Vector of 25 degrees directed superomedially in the frontal plane and 20 degrees in sagittal plane, which incorporates a 15 degree anterior pelvic tilt.
I know that it might sound confusing especially without images. However, I am happy to provide the supporting images or information backing the aforementioned cases.
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