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Total hip joint replacement

  • US 4,123,806 A
  • Filed: 01/31/1977
  • Issued: 11/07/1978
  • Est. Priority Date: 01/31/1977
  • Status: Expired due to Term
First Claim
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1. A method of total hip joint replacement involving a minimum removal of bone from a patient'"'"'s hip joint surfaces comprising:

  • separating the trochanter from the remainder of the femur;

    dislocating the hip joint to expose the diseased joint surfaces;

    removing a minimum amount of diseased bone from the surface of the head of the femur, and from the surface of the pelvis hip joint socket to expose healthy firm bone surfaces;

    selecting an entirely thin walled asymmetric, eccentric, substantially hemispherical biologically inert metal shell having an outer diameter substantially equal to the original diameter of the mating ball and socket surfaces of the patient'"'"'s hip joint with the inner surface of said metal shell being free of inwardly directed extended protrusions;

    cementing said thin metal shell over the head of the femur, with a continuous uncompartmentalized layer of cement;

    and with the thicker portion of the metal shell located at the superior or load bearing area of the head of the femur;

    selecting an asymmetric eccentric substantially hemispherical high strength biologically inert plastic liner having an inner diameter giving minimum clearance relative to the outer diameter of said metal shell, and having a thickness approximately equal to the thickness of the diseased bone layer which was removed;

    cementing said plastic liner into the hip socket with the thicker portion of sais plastic liner being oriented at the superior or load bearing area of the socket;

    engaging said metal shell and plastic liner; and

    securing the patient'"'"'s trochanter onto the femur.

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