Hip or shoulder prosthesis and placement instruments

An extractor, said extractor configured to assist in removal of a femoral head or a humeral head from a patient's body, said extractor comprising:

• a handle member (220);
• a cannulated screw member (210);
• said cannulated screw member comprising:
• an outer shaft with a first end and a second end, said first end of said outer shaft having an opening defining a hollow interior cavity;
• said second end of said outer shaft comprising a plurality of openings interconnected with said hollow interior cavity;
• an external screw thread configured to protrude away from a portion of said second end of said outer shaft, said external screw thread configured to be screwed into a bored opening in the femoral or humeral head;
• an inner shaft member (230), at least a portion of said inner shaft member comprising external threading;
• said inner shaft member comprising a slotted opening (235) being elongated parallel to a central axis of said inner shaft member;
• a plurality of claws (240), each of said plurality of claws being pivotally attached proximate to a first end of said inner shaft member, being configured to pivot between an extended position where each said claw is angled radially with respect to the central axis of said inner shaft member, and a retracted position where each said claw is oriented substantially parallel to the central axis of said inner shaft member;
• an actuation member (250), said actuation member comprising internal threading;
• wherein said inner shaft member with said plurality of claws is slidably received in said hollow interior cavity of said cannulated screw member, being slidable therein from a first position where said claws are in said retracted position, and a second position where said claws exit a respective said opening of said plurality of openings at said second end of said outer shaft and are driven into said extended position;
• wherein said inner shaft member is rotatably mounted to said actuation member with said internal threading of said actuation member threadably coupled to said external threading of said inner shaft member;
• an anti-rotation pin;
• and
• wherein said cannulated screw member is secured to said handle member, with said anti-rotation pin received through said slotted opening in said inner shaft member to inhibit rotation of said inner shaft member.