Migration of the uncemented Harris-Galante acetabular cup - Results of the einbildroentgenanalyse (EBRA) method

Seventy primary total hip arthroplasties using the Harris-Galante acetabular cup (Zimmer, Warsaw, IN) were prospectively examined. Over the entire period of 65.4 +/- 7.8 months, radiologic migration analysis was performed using the Einbildroentgenanalyse (EBRA) method at an accuracy of 1 mm. Although there was clinically no suspicion of prosthetic loosening in any case, in 8 implants (11.4%) migration of more than 1 mm was observed. Cranial migration occurred in 3 cases (1.1, 1.3 and 1.6 mm), medial migration in 3 cases (1.1, 1.1, and 2.9 mm), and lateral migration in 2 cases (1.1 and 1.1 mm). In the other 62 cases, however, no migration was traceable. Compared with measurements of other implant systems by means of the EBRA method published recently by other groups, the migration rate of the Harris-Galante cup was without exception lower and provided excellent midterm implant stability.