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J Shoulder Elbow Surg. 2018 May;27(5):903-911. doi: 10.1016/j.jse.2017.12.014. Epub 2018 Feb 15.

Quantifying success after total shoulder arthroplasty: the substantial clinical benefit.

Author information

1
Palm Beach Orthopaedic Institute, Palm Beach Gardens, FL, USA.
2
Department of Orthopedic Surgery, Bordeaux-Mérignac Clinic, Mérignac, France.
3
Department of Orthopedics., University of Florida,Gainesville, FL, USA.
4
Department of Orthopedic Surgery, NYU Langone Orthopaedic Hospital, New York, NY, USA. Electronic address: joseph.zuckerman@nyumc.org.
5
Exactech, Inc., Gainesville, FL, USA.

Abstract

BACKGROUND:

An understanding of the substantial clinical benefit (SCB) after total shoulder arthroplasty (TSA) may help to gauge a minimum threshold beyond which a patient perceives his or her outcome as being substantially better. This study quantifies SCB for 7 outcome metrics and active motion measurements after shoulder arthroplasty and determines how these values vary based on prosthesis type, patient age at surgery, sex, and length of follow-up.

METHODS:

A total of 1,568 shoulder arthroplasties with 2-year minimum follow-up were performed by 13 shoulder surgeons and enrolled in a multicenter registry. The SCB for the American Shoulder and Elbow Surgeons Shoulder Assessment, Constant Score, University of California Los Angeles Shoulder Rating Scale, Simple Shoulder Test, Shoulder Pain and Disability Index, global shoulder function, and visual analog scale pain scores, as well as active abduction, flexion, and external rotation were calculated for different patient cohorts using an anchor-based method.

RESULTS:

The anchor-based SCB results were American Shoulder and Elbow Surgeons score, 31.5 ± 2.0; Constant Score, 19.1 ± 1.7; University of California Los Angeles Shoulder Rating Scale score, 12.6 ± 0.5; Simple Shoulder Test score,  3.4 ± 0.3; Shoulder Pain and Disability Index score,  45.4 ± 2.2; global shoulder function, 3.1 ± 0.2; visual analog scale, 3.2 ± 0.3; active abduction, 28.5° ± 3.1°; active forward flexion, 35.4° ± 3.5°; and active external rotation, 11.7° ± 1.9°. Anatomic TSA patients, male patients, and patients of longer follow-up duration were associated with higher SCB values than female patients, reverse TSA patients, and patients of shorter follow-up duration.

CONCLUSION:

Our analysis demonstrated two-thirds of patients achieved the SCB threshold after TSA. Generally, a change of 30% of the total possible score for each outcome metric approximates or exceeds this SCB threshold.

KEYWORDS:

Anatomic total shoulder arthroplasty; SCB; reverse total shoulder arthroplasty; shoulder arthroplasty; shoulder replacement; substantial clinical benefit

PMID:
29398395
DOI:
10.1016/j.jse.2017.12.014
[Indexed for MEDLINE]

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