A three dimensional computer simulation was used to assess head center position and safe screw trajectories.
In this setting, rendering is aimed at what we called the "control point" at the passenger's head center position.
The Femoral Head Center (FHC) is determined by fitting a 'sphere of best fit' to the femoral head.
Both HRTFs refer to the transfer functions between a source positioned at with respect to the head center and two ears.
Results: Peak head center of gravity (CG) accelerations for the dummy ranged from 71×g to 154×g, and were greater than cadaver values, which ranged from 68×g to 103×g.
To elucidate in vivo hip instability by comparing normal hips to hips with acetabular dysplasia by evaluating three-dimensional (3D) translations of the femoral head center (FHC) at different hip positions using magnetic resonance imaging (MRI).
Results of this in vitro study indicate that a modified hemispherical implant geometry can reduce head center elevation while permitting favorable screw fixation trajectories into the pelvis in comparison to a conventional jumbo cup.
Horizontal and vertical head to head restraint offsets were significantly correlated with rearward translational motion of the head center of gravity relative to the upper torso across all occupants.
In this case, minimal arc length and the high position of the tip of the greater trochanter in relation to the head center, predicts early bony impingement (greater trochanter to ilium) (Fig. 5).
In revision surgery, femoral bone loss is highly variable, and restoration of the femoral head center at the correct length, offset, and anteversion with soft tissue balance may be difficult to achieve [9].
Subtle differences between angular velocities were seen during shoulder rotation although our findings imply that the humeral head center was stable in the normal glenohumeral joint regardless of angular velocity.
