D'Apuzzo Michele R, Nevelos Jim, Yeager Alyssa, Westrich Geoffrey H
Hospital for Special Surgery, Department of Orthopaedic Surgery, New York, New York.
Stryker Orthopaedics, 325 Corporate Drive, Mahwah, New Jersey.
J Arthroplasty. 2014 Sep;29(9):1854-6. doi: 10.1016/j.arth.2014.04.035. Epub 2014 Jun 5.
Smaller head sizes and head/cup ratios make cups smaller than 50mm and larger than 58mm, more prone to dislocation. Using computer modeling, we compared average head sizes and posterior horizontal dislocation distance (PHDD) in two 78-patient matched cohorts. Cup sizes were small (≤50mm) or large (≥58mm). The control cohort had conventional fixed bearing prostheses, while the experimental cohort had anatomical dual mobility (ADM) hip prostheses. ADM cups have larger average head sizes and PHDD than traditional fixed bearing prostheses by 11.5mm and 80% for cups ≤50mm, and 16.3mm and 90% for cups ≥58mm. Larger head sizes and increased head/cup ratio may allow the ADM prosthesis to reduce the incidence of dislocation.
较小的头部尺寸和头臼比会使直径小于50毫米和大于58毫米的髋臼杯更容易发生脱位。我们使用计算机建模，比较了两个各有78名患者的匹配队列的平均头部尺寸和后水平脱位距离（PHDD）。髋臼杯尺寸为小（≤50毫米）或大（≥58毫米）。对照组采用传统的固定承重假体，而实验组采用解剖型双动（ADM）髋关节假体。对于直径≤50毫米的髋臼杯，ADM髋臼杯的平均头部尺寸和PHDD比传统固定承重假体分别大11.5毫米和80%；对于直径≥58毫米的髋臼杯，分别大16.3毫米和90%。更大的头部尺寸和增加的头臼比可能使ADM假体降低脱位发生率。
