Minimum 10-Year Outcomes of Double-Tapered Cemented Stems With Line-To-Line Cementing: A Comparative Study of Collared and Collarless Stems.

Abstract

This study aimed to evaluate the clinical and radiological outcomes of stems using the line-to-line technique with a minimum follow-up of 10 years. A retrospective comparative study was conducted on 282 consecutive primary total hip arthroplasties (244 patients) using two cemented stem types at a single institution by a single surgeon from 1996 to 2011. Clinical and radiological assessments and stem survival analysis were performed. There were no significant differences in hip function outcomes or complication rates between the groups. The 10-year stem survival rate for any revision was 97.0% (95% CI [confidence interval]: 93.6 to 99.6) in stem group A and 99.0% (95% CI: 94.6 to 99.9) in stem group B, respectively (P = 0.279). Both groups had a 100% survival rate for aseptic loosening. Stem subsidence was more in stem group B (P < 0.001). Cortical hypertrophy occurred in 28.9 and 19.8% of the two groups, respectively, with good clinical outcomes in affected patients. The 10-year clinical and radiological outcomes for stems using the line-to-line technique were excellent, with no revisions required for aseptic loosening.