I see a big cam, but there’s no intersection zone visualized?
When simulated motion is limited, the Move Forward™ 3D motion simulation report provides intersection zones that show you which areas of the bones overlap at the end points of the motion tests.
The intersection zones in our reports are based on the limitations of simulated range of motion, rather than on shape deviations from normative bone morphology. A femur with a large cam deformity can have a relatively large range of motion if it is placed in a shallow dysplastic acetabulum. If that is the case and no motion limitations are detected, our software does not calculate any intersection zones.
Underlying is a fundamental clinical question that, as engineers, we cannot answer: Should all hip joints be corrected to a normative average (a spherical femoral head)? Instead we use the simulations as a basis, telling the surgeon where the intersecting zones are when an average range of motion is applied.
If you wish to address the cam deformity based on its morphology only, we recommend using the alpha angle pictures on page 3 of the report.
CT image related questions
- Rejection due to lack of knee images
- Why does Clinical Graphics reject imaging with short femurs?
- Why is imaging of both hips required for a report of one joint side?
- What type of CT image reconstruction is preferred (continuous or overlap)?
- Does Clinical Graphics include pelvic tilt in its simulations?
- What are the dimensions of the field of view reconstruction for CT scans?
MRI image related questions
- Does Clinical Graphics take soft tissue into account?
- Does Clinical Graphics include pelvic tilt in its simulations?
- Rejection due to lack of knee images
- Why does Clinical Graphics reject imaging with short femurs?
- Can I use intra-articular gadolinium for MRI scans?
- Why is there a surcharge for processing MRI image data?
PDF report general questions
Report delivery time related questions
Range of motion simulation related questions
- How did Clinical Graphics determine the range of motion target end points?
- I see a big cam, but there’s no intersection zone visualized?
- Does Clinical Graphics include pelvic tilt in its simulations?
- Are the simulations based on a fixed center of rotation for the hip?
- How accurate are these simulations?