| 摘要 |
An improved modular prosthetic joint has a stem portion embedded in a bone with a removable bearing head frictionally mounted on the stem portion. The bearing head has a bore which mates with a tapered shaft of the stem portion. The bearing head has a generally thin wall defining its continuous and unbroken bearing outer surface, with a wall portion extending directly over the tapered shaft which is thinner than the remainder of the bearing head wall. A puller engages an annular shoulder of the bearing head to pierce through the thinner wall portion of the bearing head, engage the tapered shaft and urge the bearing head away from the tapered shaft. Thus, the bearing head is pierced and removed from its associated stem portion, and second replacement bearing head is then mountable on the tapered shaft by impaction.
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