Accolade II

Design

• Size specific medial curvature allows for a correctly proportioned stem that better fits more patients by maximising the implant to bone surface contact

Fit

• Designed to fit more patients while accommodating a variety of surgical approaches

Efficiency

• Simple broach-only instrument system accommodating a variety of surgical approaches

Most current tapered wedge hip stems were designed based upon the original Mueller straight stem design introduced in 1977¹. These stems were designed to have a single medial curvature and grew laterally to accommodate different sizes¹.

Changing patient demographics and expectations have placed new demands on modern implants.

Accolade II has been uniquely designed using Stryker’s proprietary SOMA technology which revealed the optimal design for fit across a broad range of bone sizes and shapes found in today’s patients^2,3,4,5,6.

Issa et al, Radiographic fit and fill analysis of a new second-generation proximally coated cementless stem compared to its predicate design, Journal of Arthroplasty, April 2013

Abstract: The purpose of this study was to compare in vivo fit and fill analysis of a new second-generation proximally coated cementless stem compared to its predicate design. This prospective trial of 100 total hip arthroplasties compared specific radiographic “Fit and Fill” parameters between the two designs. Fit type was assessed by comparing the type of canal fill. Post-operative fill parameters such as mean stem-to-canal ratios and mean minimum and maximum gaps between the stems to the cortical bone in different sections and areas were compared. A significantly higher proportion of the second-generation stems had Type I fit (82% vs. 54%), had better stem to canal fill ratio in the middle (90.6% vs. 85.3%) and distal sections (88.1% vs. 78.6%) compared to the older design. The new second-generation stem design had a significantly better canal fit and distal canal fill in the medial and lateral portions.

Faizan et al, Development and Verification of a Cementless Novel Tapered Wedge Stem for Total Hip Arthroplasty, Journal of Arthroplasty, Sep 2014

Abstract: Most current tapered wedge hip stems were designed based upon the original Mueller straight stem design introduced in 1977. These stems were designed to have a single medial curvature and grew laterally to accommodate different sizes. In this preclinical study, the design and verification of a tapered wedge stem using computed tomography scans of 556 patients are presented. The computer simulation demonstrated that the novel stem, designed for proximal engagement, allowed for reduced distal fixation, particularly in the 40–60 year male population. Moreover, the physical micromotion testing and finite element analysis demonstrated that the novel stem allowed for reduced micromotion. In summary, preclinical data suggest that the computed tomography based stem design described here may offer enhanced implant fit and reduced micromotion.

There are 205 Accolade II stems recorded in the New Zealand joint registry in combination with Trident and Tritanium with only one recorded revision⁷.