A Safe and Effective Solution in Primary THA for Monobloc Du
Instability constitutes over 20% of revisions after THA. Dual mobility(DM) designs were introduced as a solution to this problem. However, few have reported promising results for monobloc DM constructs have been limited by sample size and/or length of follow-up. The purpose of this study is to evaluate mid-term outcomes of a single-surgeon series utilizing a monobloc DM acetabular component in patients with high risk for dislocation.

207 primary THAs implanted with a monobloc DM component in patients who were considered high risk for dislocation. Patient demographics and case-specific data were collected retrospectively. All patients had a minimum of 5-years follow-up.

Results:
--Radiographic analysis did not reveal acetabular radiolucency in any patients and there were no revisions for aseptic loosening. Additionally, there were no dislocations.

--7/205 patients were revised, 5 on the femoral side due to periprosthetic fracture and the remaining two for infection.

--Survivorship of the acetabular component from revision was 99%.

--The mean VR-12 physical score improved from 7 preoperatively to 9.5 at final follow-up.

--Similarly, the HOOS improved from 8 preoperatively to 21.2.

Conclusively, Monobloc DM components reliably prevent dislocation in high-risk patients following initial THA. This DM monobloc component has excellent implant survivability, radiographic fixation, and better functional outcomes during mid-term follow-up.

Source: https://www.sciencedirect.com/science/article/abs/pii/S0883540321007130?dgcid=rss_sd_all
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