Biomedical Engineering Reference
In-Depth Information
10mm Spherical Burr
Tibial Radiusing Osteotome
Tibial Window Impactor
Tibial Resection Guide
Talar Shaping Rasp
Capture Plate
Talar emp
Tibial Window Osteotome
late
Talar Drill Guide
Tibial Trial Component
Thick Talar Drill Guide
Fixation
Pins &
Puller
Fixation Pin Drill
Sliding Cylindrical Bearing Trial
Talar Stop Drill
Talar Trial Component
Talar Impactor
Thick Talar Trial Component
Bearing Impactor
Fig. 4.31
B-P Mark III Total Ankle Replacement Instruments
4.5.3.2 Properties of the B-P Mark III
a) Surfaces
The primary articulation of the Mark II and III are generated by the use of a
generating curve, as shown in Fig. 4.32. It is similar to, but smaller than, that used
to generate the articular surface of the New Jersey knee [80].
In the ankle, however, since the range of motion is considerably less than the
knee, a single talar radius of revolution is used rather than the multiple radii used
in the knee. This single generating radius allows full congruity in the ankle for the
entire motion range.
b)
Ankle Motion
The B-P ankle provides near normal plantar and dorsiflexion well beyond the
motion required for walking as illustrated in Fig. 4.33.
