Schmidt, J Arthroplasty 2020 - Dual Mobility Cups in Revision Total Hip Arthroplasty: Efficient Strategy to Decrease Dislocation Risk

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Dual Mobility Cups in Revision Total Hip Arthroplasty: Efficient Strategy to Decrease Dislocation Risk

Schmidt, Lustig, et al.·J Arthroplasty·2020·55 citations·Retrospective cohort

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Background

Revision total hip arthroplasty (rTHA) is a challenging surgery with a higher rate of complications than primary arthroplasty, particularly instability and aseptic loosening. The purpose of this study is to compare dual mobility cup (DMC) and standard mobility cup (SMC) in all rTHAs performed at our institution over a decade with a 1 year minimum follow-up.

Methods

295 rTHAs (acetabular only and bipolar revisions) between 2006 and 2016 were retrospectively reviewed.
These were divided into those with a DMC (184 revisions) or SMC (111 revisions).
Dislocation and complications requiring re-revision were reported.

Results

The rTHA mean age was 69 years ± 13.9 (19-92) and the mean follow-up was 2.3 years.
Dislocation risk was statistically lower (P = .01) with a DMC (3.8%; 7/184) than with an SMC (13.5%; 15/111).
DMC required re-rTHA in 24/184 (13%) for any reason compared to SMC in 19/111 (17.1%) (P = .34).
There was no significant difference in early aseptic loosening (P = .28) between the 2 groups.
For young patients (≤55 years), results were similar with a lower dislocation rate in the DMC group (P = .24) and no increased risk of early aseptic loosening (P = .49).

Conclusions

This study demonstrates that for all rTHA indications DMC compared to SMC has a significantly decreased risk of postoperative dislocation without risk of early aseptic loosening at medium term follow-up. The use of DMC in rTHA is an important consideration particularly with the predicted increased incidence of both primary and revision THA globally.

Copyright remains with the authors and publisher.

Dual Mobility Cups in Revision Total Hip Arthroplasty: Efficient Strategy to Decrease Dislocation Risk.

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Dual Mobility Cups in Revision Total Hip Arthroplasty: Efficient Strategy to Decrease Dislocation Risk

Schmidt, Lustig, et al.·J Arthroplasty·2020·55 citations·Retrospective cohort

|

Background

Revision total hip arthroplasty (rTHA) is a challenging surgery with a higher rate of complications than primary arthroplasty, particularly instability and aseptic loosening. The purpose of this study is to compare dual mobility cup (DMC) and standard mobility cup (SMC) in all rTHAs performed at our institution over a decade with a 1 year minimum follow-up.

Methods

295 rTHAs (acetabular only and bipolar revisions) between 2006 and 2016 were retrospectively reviewed.
These were divided into those with a DMC (184 revisions) or SMC (111 revisions).
Dislocation and complications requiring re-revision were reported.

Results

The rTHA mean age was 69 years ± 13.9 (19-92) and the mean follow-up was 2.3 years.
Dislocation risk was statistically lower (P = .01) with a DMC (3.8%; 7/184) than with an SMC (13.5%; 15/111).
DMC required re-rTHA in 24/184 (13%) for any reason compared to SMC in 19/111 (17.1%) (P = .34).
There was no significant difference in early aseptic loosening (P = .28) between the 2 groups.
For young patients (≤55 years), results were similar with a lower dislocation rate in the DMC group (P = .24) and no increased risk of early aseptic loosening (P = .49).

Conclusions

This study demonstrates that for all rTHA indications DMC compared to SMC has a significantly decreased risk of postoperative dislocation without risk of early aseptic loosening at medium term follow-up. The use of DMC in rTHA is an important consideration particularly with the predicted increased incidence of both primary and revision THA globally.

Copyright remains with the authors and publisher.

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