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  • Title: Loosening of the socket in a 35-mm snap-fit prosthesis and the Charnley hip prosthesis. A roentgenographic evaluation of 321 cases operated upon because of osteoarthritis.
    Author: Carlsson AS, Lindberg HO, Sanzén L.
    Journal: Clin Orthop Relat Res; 1988 Mar; (228):63-8. PubMed ID: 3342588.
    Abstract:
    Migration and lucencies around the acetabular component were evaluated in serial roentgenograms of patients with osteoarthritis treated with total hip arthroplasty (THA); 207 were Charnley and 114 were Brunswik THAs. In this consecutive series of THAs followed for nine to ten years, the loosening rate (corrected for deaths and revisions) was significantly higher (35%-45%) in the Brunswik snap-fit sockets (bearing surface 35 mm in diameter) than in the Charnley sockets (5%-12%). Presumably, mechanical factors, i.e., friction torque and impingement, are responsible for the difference in durability between the two designs.
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