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CT stem program offers enhanced implant fit, reduced micromotion for THA
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Use of a CT-based stem design program may offer enhanced implant fit and reduced micromotion among patients undergoing total hip arthroplasty, according to study results.
Researchers used a custom CT program to assess the design and verification of a conventional stem (Accolade TMZF, Stryker Orthopaedics) and a novel stem (Accolade II, Stryker Orthopaedics) among 556 patients undergoing total hip arthroplasty.
Although the Accolade TMZF stem showed a well-balanced distal-to-proximal ratio in the median sizes, the Accolade II stem design showed a well-balanced proximal-to-distal ratio through the complete size range, according to study results. The researchers also found the Accolade II stem design showed a reduced percentage of distal engagements vs. the Accolade TMZF stem design with respect to type 3 fit classification.
Ahmad Faizan
The distal engagement for the Accolade TMZF stem increased in the 40- to 60-year-old male group, whereas the distal engagements remained unchanged for the Accolade II stem. Results showed a trend of less overall micromotion for the Accolade II stem vs. the Accolade TMZF stem, as well as increased micromotion for the shortened Accolade TMZF stem.
The researchers observed a statistically significant enhanced stability in all outcome measures for the Accolade II stem vs. the Accolade TMZF stem.
Compared with the Accolade TMZF, the Accolade II stem was significantly smaller and had a significantly lower rate of increase in retroversion with increasing load, as well as a significantly smaller subsidence and a significantly lower rate of increase in subsidence with increasing load. The researchers also found significantly lower cyclic retroversion and cyclic subsidence and a significantly lower rate of increase in cyclic motion for both cyclic retroversion and cyclic subsidence for the Accolade II stem. – by Casey Tingle
Disclosures: Faizan reports he is a paid employee of Stryker. Please see the full study for a list of all other authors’ relevant financial disclosures.
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