Patent ID: 6974483

Claim:
In a hip prosthesis including a modular neck adapter having a tapered shank on one end thereof along a first axis and further including a main body portion having a face provided with a tapered bore having an opening to receive the tapered shank on the modular neck adapter, and wherein the tapered shank and the tapered bore are devoid of teeth or splines, the improvement which comprises a counterbore formed in the face of the main body portion, the counterbore being disposed adjacent and circumferentially to the tapered bore and opening on the face of the main body portion, a shoulder on the modular neck adapter, the shoulder being provided with tapered indexing locking teeth cooperating with correspondingly tapered indexing locking teeth on the counterbore in the main body portion, wherein the prosthesis may be readily adapted by the orthopedic surgeon to the bodily configuration of the specific patient in the operating room; and wherein, when thus installed in the patient, the end of the tapered shank on the modular neck adapter does not bottom within the tapered bore in the main body portion, and the shoulder on the modular neck adapter does not engage the face of the main body portion.