Total hip joint replacement using a CoCrMo metal-metal sliding pairing

Area of Science:

• Orthopedic Surgery
• Biomaterials Science
• Biomedical Engineering

Background:

• Late loosening in total hip replacement is often caused by polyethylene wear debris triggering a foreign body reaction.
• Older metal-metal prostheses (McKee type) demonstrate excellent longevity without osteolysis, suggesting material superiority.
• Cement fixation can provide adequate long-term stability in hip implants.

Purpose of the Study:

• To evaluate the long-term performance of metal-metal total hip prostheses.
• To compare the efficacy of metal-metal articulation versus polyethylene in total hip replacement.
• To introduce and assess a novel metal-metal hip joint design.

Main Methods:

• Review of clinical outcomes for McKee-type metal-metal hip prostheses.
• Presentation and implantation data of a new metal-metal total hip joint design.
• Analysis of bone-implant interface and osteolysis signs.

Main Results:

• Metal-metal prostheses, even from the 1960s, can function without loosening or osteolysis.
• Metal-metal pairing demonstrates superior performance compared to polyethylene components in total hip replacement.
• The new metal-metal hip joint has been implanted 90 times between 1988 and 1991 with promising initial results.

Conclusions:

• Metal-metal articulation is a superior bearing surface for total hip replacement, reducing wear-related complications.
• Cemented fixation remains a viable and adequate method for achieving stable total hip arthroplasty.
• The novel metal-metal hip joint design warrants further investigation for long-term efficacy.