DOS 2017

112

· DOS Abstracts

Resurfacing hemiarthroplasty versus reverse shoulder

arthroplasty in treatment of cuff tear arthropathy - a

matched-pair analysis

Mette Ammitzbøll, Jeppe V Rasmussen, Amin B Baram, Stig Brorson, Bo S Olsen,

Ortopædkirurgisk afdeling T, Herlev Hospital

Background:

Resurfacing hemiarthroplasty (RHA) has previously been used for

cuff tear arthropathy (CTA). Reverse shoulder arthroplasty (RSA) has, however,

emerged to be the treatment of choice for CTA. The efficacy and risk of revision

of RSA have, however, never been compared with RHA.

Purpose / Aim of Study:

To compare the patient-reported outcome and the

number of revision between RHA and RSA for CTA.

Materials and Methods:

We included CTA patients from the Danish Shoulder

Arthroplasty Registry (DSR) from 1st January 2006 to 31st December 2013.

110 RHA cases were matched by age and sex with 219 RSA controls. The West-

ern Ontario Osteoarthritis of the Shoulder (WOOS) Index at 1 year was used as

primary outcome and revision, defined as removal or exchange of any compo-

nent or the addition of a glenoid component, as secondary outcome.

Findings / Results:

The mean WOOS of RHA and RSA were 53 (SD=28) and

70 (SD=25) respectively. The mean difference was 16, p<0,001, 95% CI (9;

24). The revision rate of RHA was 6% (n=6) and the revision rate of RSA was

7% (n=16), p=0,28. In patients below 70 years of age the median WOOS of

both RHA (n=14) and RSA (n=25) was 56, p=0,72. In patients above 70 years

of age the median WOOS of RHA (n=58) and RSA (n=118) was 48 and 79. The

difference of 31 was statistically significant, p<0,001.

Conclusions:

In this nationwide cohort RSA had a statistically significant bet-

ter patient-reported outcome compared with RHA especially in patients older

than 70 years. In patients under 70 years of age the WOOS score was low with

no difference between RHA and RSA. The results support the use of RSA in the

treatment of CTA in patients older than 70 years of age. The outcome of RHA

and RSA in patients younger than 70 years was disappointing disregard arthro-

plasty type, and the treatment of CTA in young patients remain a challenge.

No conflicts of interest reported

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