DOS 2017

DOS Kongressen 2017 ·

Reverse total shoulder arthroplasty for Cuff-Tear Ar-

thropathy: Outcome, revision rate and indication for

revision for 504 arthroplasties reported to the Danish

Shoulder Arthroplasty Registry

Amin Bakhtyar Baram, Mette Ammitzbøll, Bo Sanderhoff Olsen, Stig Brorson,

Jeppe Vejlgaard Rasmussen

Orthopedic department, Herlev og Gentofte Hospital

Background:

Reverse shoulder arthroplasty (RSA) is gaining increasingly pop-

ular. When used for cuff tear arthropathy the results are superior to that of

hemiarthroplasty . Previous studies are, however, small and information about

revision rates is limited

Purpose / Aim of Study:

The aim of this study is to examine the patient- re-

ported outcome and the risk of revision of RSA for CTA on a national level using

data from the Danish Shoulder Arthroplasty Registry (DSR).

Materials and Methods:

We reviewed all patients treated with RSA for CTA

reported to the DSR from 2006 until 2012. Patient- reported outcome was

assessed by a postal survey 12 months (10 to 14) post-operatively using the

WOOS score. Revision rates were illustrated using the Kaplan Meier method and

the hazard ratio was calculated using the cox regression model.

Findings / Results:

The cumulative rate of revision within five years was 11,7%.

The hazard ratio for men being revised was 3.6 (95% CI 1,9-7,0; p = <0,01).

Common indications for revision were infection (2,2%) and luxation (2,6%). A

complete questionnaire was returned by 372 patients (74%). The mean WOOS

was 68. 14% had a WOOS score below 40 which is regarded as a clinical failure

by the registry. There was no significant or clinical relevant difference in the

mean WOOS between age groups (<65/>65 years) or gender. The Delta Mark

III was a significant risk of clinical failure. Mean WOOS peaked to a maximum of

73 in 2010, but then decreased to 68 in 2012.

Conclusions:

The incidence of RSA for CTA increased in the study period. The

mean WOOS was acceptable, but has decreased in the most recent years. The

high number of revisions in general and the high numbers of revision because of

infection in particular are worrying It is important that RSA is used for the cor-

rect indications and with adequate surgical technique.

No conflicts of interest reported

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