ReCap™ Total Resurfacing System
9. Guide Rod Placement
Prior to inserting the guide rod, it is important to
understand the sizing rationale of the different
length rods. The ReCap
®
guide rods are available in
6 different lengths. These lengths allow the surgeon
to accurately resect predetermined amounts of bone
from the top of the femoral head in order to restore
the patient’s natural anatomy. (Figure 16)
For example, if a STD guide rod is used, the spherical
reamer will remove 6.5mm of bone from the top
of the femoral head. This 6.5mm equates to the
Figure 16
thickness of the ReCap
®
resurfacing head. The top
of the prosthetic head is, therefore, at the same
position as the anatomic head. A –3mm guide rod
will permit the removal of only 3.5mm, (6.5mm –
3mm) therefore increasing the neck length by 3mm
and a +3mm guide rod will permit the removal of
9.5mm (6.5mm + 3mm) and will therefore shorten
the neck length by 3mm.
See table below for details of how much bone is
resected for each of the guide rods.
It is important to note that, if after cylindrical
reaming the desired cut depth is not achieved and
additional bone needs to be removed, a “+” guide
rod will allow the cylindrical reamer to further
advance down the femoral head.
During this procedure care must be taken to
prevent notching of the femoral neck.
Guide Rod -3.0mm STD 1.5mm 3mm 4.5mm 6mm
Bone Resected 3.5mm 6.5mm 8.0mm 9.5mm 11.0mm 12.5mm
12
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