The combination of distal diaphyseal press-fit anchoring in the isthmus of the femur and the fluted tapper shape of the stem with relatively sharp, indented longitudinal shaft-rips with the rough corundum-blasted implant surface, leading to minimal axial migration by facilitating bone ingrowth.
According to the nature of coupling with the rotor, disk vibratory modes are classified into three groups: uncoupled disk modes with more than one nodal diameters, umbrella modes coupled with the shaft longitudinal vibrations and disk modes with a single nodal diameter coupled with the shaft bending vibrations.
Anteroposterior tibial-talar alignment was quantified using tibiotalar ratio (ratio into which the mid-longitudinal axis of the tibial shaft divides the longitudinal talar length) on lateral ankle radiographs [ 4, 17].
The femoral stem positioning should be aligned with the longitudinal axis of the shaft (line F = normal, longitudinal axis of the shaft).
Results indicate that the active controller is capable of attenuating the longitudinal vibrations of the shaft by approximately 11 dB over a frequency range of 0 10 Hz.
Cracks are considered to lie on arbitrary angular positions around the longitudinal axis of the shaft at any distance from the clamped end and characterized by three measures: position, depth, and relative angle.
Longitudinal data on bone shaft geometry changes in GC-treated patients, however, are as yet absent.
The development of an active control system for suppressing the longitudinal vibrations of propeller shafts is described.
Ideally, the position of the femoral stem (Fig. 11) on an AP view should be seen in neutral alignment with the longitudinal axis of the femoral shaft, and the tip situated in the centre of the shaft.
d Longitudinal arch of the femoral shaft.
