DOS 2016

DOS Kongressen 2016 ·

103

Long-term Survival Rates of Different Shoulder

Arthroplasty Types Used for Glenohumeral

Osteoarthritis.

Jeppe Vejlgaard Rasmussen, Steen Lund Jensen, Stig Brorson

Orthopaedic Surgery, Herlev Hospital; Orthopaedic Surgery, Aalborg Hospital;

Orthopaedic Surgery, Herlev Hospital

Background:

The functional outcome following total shoulder arthroplasty is

superior to that of hemiarthroplasty, but surgeons may hesitate to use a glenoid

component because of the risk of loosening

Purpose / Aim of Study:

The aim of this study was to compare 10-year sur-

vival rates for common types of primary shoulder arthroplasty used for osteo-

arthritis and to evaluate age as risk factor for revision.

Materials and Methods:

This study is based on a dataset from the Nordic

Arthroplasty Registry Association. Data from 2004-13 was prospectively col-

lected by the national registries in Denmark, Norway and Sweden and merged

into a common dataset in 2014. The dataset was defined as a set of variables

containing only data that all registries could deliver. Revision was defined as re-

moval or exchange of any component or the addition of a glenoid component.

Findings / Results:

6,871 arthroplasties were used for osteoarthritis. The es-

timated survival rates at 10 year after resurfacing hemiarthroplasty (n=1,923),

stemmed hemiarthroplasty (n=1,587), anatomical total shoulder arthroplasty

(n=2,340) were 0.82, 0.92 and 0.96 respectively (p<0.001, Log rank test).

Glenoid loosening as a cause of revision in anatomical total shoulder arthro-

plasty was rare (0.5%). The risk of revision for patients younger than 55 years

was 3.8 (2.8-5.3 95% CI), p<0.001 compared to patients older than 75 years,

and 1.6 (1.2-2.1 95% CI), p=0.001 compared to patients between 55 and 75

years (gender, year of surgery and arthroplasty design were included in the cox

regression model).

Conclusions:

We found the lowest revision rate for total shoulder arthroplasty

with low risk of glenoid loosening. The results support the choice of anatomical

total shoulder arthroplasty as our preferred treatment of osteoarthritis. Young

patients have, independently of the arthroplasty type, a high risk of revision.

No conflicts of interest reported

54.