Stryker Orthopaedics Howmedica Osteonics Exeter Acetabular Rim Cutter Handle. Bn.

To team up with Exeter X3 RimFit Acetabular Cup.

Brand new still in original package.

Optional Use of Rim Cutter Instrument

The Rim Cutter (an instrument which cuts a rim into the acetabulum and is not intended to cut the rim of the implant) marked with the same size as the cup OD to be inserted is attached to the power reamer. The Rim Cutter is designed to cut a groove in the periphery of the acetabulum of the appropriate diameter for the flange.

Do not use Rim Cutter if there is inadequate bone stock. The hemisphere on the Rim Cutter centralizes the cutter in the reamed socket and sets the depth of the rim and thus the position of the cup. Each Rim Cutter has to be used with its correct hemispherical guide. If the acetabulum is reamed to 56mm, use Rim Cutter size 54 with 54 green hemispherical guide. The orientation of the Rim Cutter is shown by the alignment rod on the device to obtain optimal component positioning (Figure 6).

The cup should be orientated in a position of 45° abduction (the handle of the Charnley style introducer will point vertically upwards) and 25° (the handle in the longitudinal axis of the patient is rotated around the transverse axis of the patient by 25°).

Figure 6

The Rim Cutter is advanced to the fullest extent allowed by exerting pressure against the spring between the dome and cutting ring (Figure 7). Any debris created, including the innermost fibers of the transverse ligament, are removed.

Trial positioning is carried out to ensure that the cup can be introduced without difficulty through the soft tissues into the correct position, with flange resting on the rim. If the rim of the acetabulum has been cut in an incorrect position then the flange of the cup can be cut up to the line so it will sit within the Rim Cutter shelf.