Acetabular cup malalignment after total hip resurfacing arthroplasty: a case for elective revision? 2009

Matthew C Mai, and Joseph C Milbrandt, and John Hulsen, and D Gordon Allan
Division of Orthopedics and Rehabilitation, Southern Illinois University School of Medicine, Springfield, Illinois 62794-9679, USA.

This article describes the clinical course of a patient with a resurfacing implant in a poor cup position in combination with elevated serum metal ions prior to implant failure. Following resurfacing, the patient had substantial improvement from baseline in pain and functional status. Postoperative radiographs indicated the acetabular cup in an abducted and excessively anteverted position. The acetabular component ultimately failed after 4.5 years and a traditional total hip arthroplasty revision was performed. Serum cobalt (Co) and chromium (Cr) concentrations had been collected postoperatively of the index procedure at 6 months, 1 year, 2 years, 3 years, and pre- and postoperatively at the time of implant revision. Serum cobalt and chromium ion levels were progressively elevated to approximately 400 times more than the expected range at all time points prior to revision. Elective revision had been considered due to acetabular malalignment and elevated metal ion levels, but not performed since the patient was doing well clinically. A recent study has shown a correlation between increased cup inclination and increased serum cobalt or chromium levels and this patient's levels were >40 times greater than that typically observed with this device. Early revision should be strongly considered if component malpositioning is noted, and abnormally elevated ion concentrations should signal the need for revision regardless of the patient's clinical status. The relationship of a malpositioned cup and uncharacteristically elevated metal ion levels is related to the metal-on-metal bearing coupling and likely applies to conventional metal-on-metal total hip prostheses as well.

UI MeSH Term Description Entries
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D010027 Osteotomy The surgical cutting of a bone. (Dorland, 28th ed) Osteotomies
D011474 Prosthesis Design The plan and delineation of prostheses in general or a specific prosthesis. Design, Prosthesis,Designs, Prosthesis,Prosthesis Designs
D011475 Prosthesis Failure Malfunction of implantation shunts, valves, etc., and prosthesis loosening, migration, and breaking. Prosthesis Loosening,Prosthesis Durability,Prosthesis Migration,Prosthesis Survival,Durabilities, Prosthesis,Durability, Prosthesis,Failure, Prosthesis,Failures, Prosthesis,Loosening, Prosthesis,Loosenings, Prosthesis,Migration, Prosthesis,Migrations, Prosthesis,Prosthesis Durabilities,Prosthesis Failures,Prosthesis Loosenings,Prosthesis Migrations,Prosthesis Survivals,Survival, Prosthesis,Survivals, Prosthesis
D012086 Reoperation A repeat operation for the same condition in the same patient due to disease progression or recurrence, or as followup to failed previous surgery. Revision, Joint,Revision, Surgical,Surgery, Repeat,Surgical Revision,Repeat Surgery,Revision Surgery,Joint Revision,Revision Surgeries,Surgery, Revision
D002857 Chromium A trace element that plays a role in glucose metabolism. It has the atomic symbol Cr, atomic number 24, and atomic weight 52. According to the Fourth Annual Report on Carcinogens (NTP85-002,1985), chromium and some of its compounds have been listed as known carcinogens.
D003035 Cobalt A trace element that is a component of vitamin B12. It has the atomic symbol Co, atomic number 27, and atomic weight 58.93. It is used in nuclear weapons, alloys, and pigments. Deficiency in animals leads to anemia; its excess in humans can lead to erythrocytosis. Cobalt-59,Cobalt 59
D005260 Female Females
D006622 Hip Prosthesis Replacement for a hip joint. Femoral Head Prosthesis,Femoral Head Prostheses,Hip Prostheses,Prostheses, Femoral Head,Prostheses, Hip,Prosthesis, Femoral Head,Prosthesis, Hip
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man

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