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Arch Orthop Trauma Surg. 2017 Jul;137(7):919-923. doi: 10.1007/s00402-017-2708-9. Epub 2017 May 9.

No relationship between critical shoulder angle and glenoid erosion after shoulder hemiarthroplasty: a comparative radiographic study.

Author information

1
Casa di cura Villa Betania, via Piccolomini 27, Rome, Italy. simone.cerciello@me.com.
2
Marrelli Hospital, via Gioacchino da Fiore 0962, Crotone, Italy. simone.cerciello@me.com.
3
, Via R. Zandonai 11, 00135, Rome, Italy. simone.cerciello@me.com.
4
Shoulder and Elbow Surgeon Lexington Clinic Orthopedics, Sports Medicine Center, The Shoulder Center of Kentucky, Lexington, USA.
5
Ospedali Riuniti Padova Sud, ULSS 17, Schiavonia, PD, Italy.
6
Università degli Studi del Molise, Campobasso, Italy.
7
Fondren Orthopaedic Group, Texas Orthopaedic Hospital, Houston, USA.
8
Department of Musculoskeletal Disorders, University of Salerno School of Medicine and Surgery, Salerno, Italy.
9
Centre for Sports and Exercise Medicine, Queen Mary University of London, Barts and The London School of Medicine and Dentistry, London, UK.
10
Centre Orthopédique Santy, Lyon, France.

Abstract

INTRODUCTION:

Symptomatic glenoid erosion is one of the most common causes of functional impairment after shoulder hemiarthroplasty. A decrease in the critical shoulder angle (CSA) has been associated with the development of shoulder arthritis. The inter-observer reliability of the CSA and the relationship between CSA and symptomatic glenoid erosion after shoulder hemiarthroplasty were investigated.

MATERIALS AND METHODS:

Twenty-eight patients with symptomatic glenoid erosion after anatomic hemiarthroplasty were compared to a control group of 30 patients with no signs of symptomatic glenoid erosion. The CSA was measured by two blinded shoulder surgeons at a mean follow-up of 105.2 and 54.7 months, respectively. The inter-observer reliability was calculated.

RESULTS:

The mean CSA in the control group in neutral, internal, and external rotations was 34°, 33°, and 33°, respectively. The corresponding values in the study group were 33°, 33°, and 33° (<0.01). The interclass correlation coefficient between the two examiners was 0.917 (P < 0.01), 0.924 (P < 0.01), and 0.948 (P < 0.01), respectively. The Mann-Whitney test between the control group and the study group were, respectively, 0.907, 0.932, and 0.602.

CONCLUSION:

There were no significant differences of CSA values between the two groups. Good inter-observer reliability was found for the CSA method.

KEYWORDS:

Critical shoulder angle; Glenoid arthritis; Glenoid erosion; Shoulder hemiarthroplasty

PMID:
28488015
DOI:
10.1007/s00402-017-2708-9
[Indexed for MEDLINE]

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