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. 2022 Nov 21;12(1):19997.
doi: 10.1038/s41598-022-24569-9.

Comparing postoperative outcomes of two fully hydroxyapatite-coated collarless stems in total hip arthroplasty through propensity score matching analysis with 2 years follow-up

Takashi Imagama  1 , Yuta Matsuki  2 , Takehiro Kaneoka  2 , Takehiro Kawakami  2 , Kazushige Seki  2 , Toshihiro Seki  2 , Kenji Hirata  3 , Tomoya Okazaki  3 , Hiroshi Tanaka  3 , Takashi Sakai  2
Affiliations

Comparing postoperative outcomes of two fully hydroxyapatite-coated collarless stems in total hip arthroplasty through propensity score matching analysis with 2 years follow-up

Takashi Imagama et al. Sci Rep. .

Abstract

A fully hydroxyapatite (HA)-coated stem such as Corail stem, that compacts the cancellous bone around the stem in total hip arthroplasty (THA), is reported to have good long-term results for more than 20 years. Although various fully HA-coated stems have being used recently, it is unclear whether there are differences in the postoperative outcomes. In this study, 224 patients (234 hips) with THA using either the Corail collarless stem or the Hydra stem were enrolled. And then we performed a retrospective comparison of the data at 2 years postoperatively using propensity score matching analysis. The postoperative modified Harris hip scores in 84 hips each group were 93.6 ± 8.2 points in the Corail group and 92.8 ± 10.1 points in the Hydra group, and there was no significant difference between the two groups. However, there was significantly less stem subsidence and rate of 3rd degree or greater stress shielding in the Corail group. Although these two stems were similar collarless fully HA-coated stems and clinical outcomes were favorable results in both groups at 2 years postoperatively, radiographic evaluations showed statistically significant differences between the two groups.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
Antero-posterior view of each rasping broach. The broach on the left is Hydra stem and the one on the right is Corail stem. Proximal part of Hydra broach has almost no edges unlike Corail broach.
Figure 2
Figure 2
Different shapes of the edge at each broach. The edge is relatively dull in the Corail broach (A), whereas it is sharp in the Hydra broach (B).
Figure 3
Figure 3
Difference in size of each same number broach. Overlapping the same number 9 broaches with the Corail on top, Hydra broach is more lateral overhanging in proximal part (red oval) than Corail broach in the antero-posterior view (A). In the view of each broach from cranial, the antero-posterior width is larger in the hydra broach (left) than the Corail broach (right) (B).
Figure 4
Figure 4
Flowchart showing the inclusion and exclusion of patients with follow up.
See this image and copyright information in PMC

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