Comparison of Glenoid Version and Posterior Humeral Subluxation in Patients With and Without Posterior Shoulder Instability

Stephen Arthur Parada, Josef K. Eichinger, Guillaume D. Dumont, Lauren E. Burton, Maggie S. Coats-Thomas, Stephen D. Daniels, Nathan J. Sinz, Matthew T. Provencher, Laurence D. Higgins, Jon J.P. Warner

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Purpose To evaluate glenoid version and humeral subluxation on preoperative multiplanar imaging of patients who underwent surgery for posterior glenohumeral instability compared with a matched group of patients who had shoulder surgery for other pathology. Methods All patients over a 2-year period who underwent surgery for posterior instability had preoperative magnetic resonance (MR) imaging or MR arthrogram reviewed. Patients undergoing shoulder surgery for reasons other than instability were identified as a control group and matched by sex, laterality, and age. Measurement of glenoid version and percentage of humeral subluxation was performed by 2 reviewers after completing a tutorial. Reviewers were blinded to diagnosis and to whether or not the patients were in the experimental or control group. Results There were 41 patients in each group. The average glenoid version in the control group was 5.6° of retroversion (standard deviation [SD] 3.0), and the average humeral subluxation was 54% (SD 5.1%). In the experimental group, the average glenoid version was 8.1° of retroversion (SD 5.0). The average humeral subluxation in the experimental group was 56% (SD 6.8%). Student t test revealed a statistically significant difference in glenoid version (P = .009) but not humeral subluxation (P = .25). Intra- and inter-rater reliability was measured by the intraclass correlation coefficient and found to have an excellent Fleiss rating with regard to both measurements. Conclusions Glenoid retroversion is significantly increased in patients with symptomatic posterior labral tears compared with a control group. However, there was no statistically significant difference between the groups with regard to posterior humeral subluxation and, therefore, is not a reliable indicator of the presence or absence of symptomatic posterior shoulder instability. Level of Evidence Level III, retrospective comparative study.

Original languageEnglish (US)
Pages (from-to)254-260
Number of pages7
JournalArthroscopy - Journal of Arthroscopic and Related Surgery
Volume33
Issue number2
DOIs
StatePublished - Feb 1 2017

Fingerprint

Control Groups
Tears
Research Design
Magnetic Resonance Spectroscopy
Retrospective Studies
Magnetic Resonance Imaging
Pathology
Students

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

Comparison of Glenoid Version and Posterior Humeral Subluxation in Patients With and Without Posterior Shoulder Instability. / Parada, Stephen Arthur; Eichinger, Josef K.; Dumont, Guillaume D.; Burton, Lauren E.; Coats-Thomas, Maggie S.; Daniels, Stephen D.; Sinz, Nathan J.; Provencher, Matthew T.; Higgins, Laurence D.; Warner, Jon J.P.

In: Arthroscopy - Journal of Arthroscopic and Related Surgery, Vol. 33, No. 2, 01.02.2017, p. 254-260.

Research output: Contribution to journalArticle

Parada, SA, Eichinger, JK, Dumont, GD, Burton, LE, Coats-Thomas, MS, Daniels, SD, Sinz, NJ, Provencher, MT, Higgins, LD & Warner, JJP 2017, 'Comparison of Glenoid Version and Posterior Humeral Subluxation in Patients With and Without Posterior Shoulder Instability', Arthroscopy - Journal of Arthroscopic and Related Surgery, vol. 33, no. 2, pp. 254-260. https://doi.org/10.1016/j.arthro.2016.06.023
Parada, Stephen Arthur ; Eichinger, Josef K. ; Dumont, Guillaume D. ; Burton, Lauren E. ; Coats-Thomas, Maggie S. ; Daniels, Stephen D. ; Sinz, Nathan J. ; Provencher, Matthew T. ; Higgins, Laurence D. ; Warner, Jon J.P. / Comparison of Glenoid Version and Posterior Humeral Subluxation in Patients With and Without Posterior Shoulder Instability. In: Arthroscopy - Journal of Arthroscopic and Related Surgery. 2017 ; Vol. 33, No. 2. pp. 254-260.
@article{ac0a0049f8ee41e5929e5d174b3eae5c,
title = "Comparison of Glenoid Version and Posterior Humeral Subluxation in Patients With and Without Posterior Shoulder Instability",
abstract = "Purpose To evaluate glenoid version and humeral subluxation on preoperative multiplanar imaging of patients who underwent surgery for posterior glenohumeral instability compared with a matched group of patients who had shoulder surgery for other pathology. Methods All patients over a 2-year period who underwent surgery for posterior instability had preoperative magnetic resonance (MR) imaging or MR arthrogram reviewed. Patients undergoing shoulder surgery for reasons other than instability were identified as a control group and matched by sex, laterality, and age. Measurement of glenoid version and percentage of humeral subluxation was performed by 2 reviewers after completing a tutorial. Reviewers were blinded to diagnosis and to whether or not the patients were in the experimental or control group. Results There were 41 patients in each group. The average glenoid version in the control group was 5.6° of retroversion (standard deviation [SD] 3.0), and the average humeral subluxation was 54{\%} (SD 5.1{\%}). In the experimental group, the average glenoid version was 8.1° of retroversion (SD 5.0). The average humeral subluxation in the experimental group was 56{\%} (SD 6.8{\%}). Student t test revealed a statistically significant difference in glenoid version (P = .009) but not humeral subluxation (P = .25). Intra- and inter-rater reliability was measured by the intraclass correlation coefficient and found to have an excellent Fleiss rating with regard to both measurements. Conclusions Glenoid retroversion is significantly increased in patients with symptomatic posterior labral tears compared with a control group. However, there was no statistically significant difference between the groups with regard to posterior humeral subluxation and, therefore, is not a reliable indicator of the presence or absence of symptomatic posterior shoulder instability. Level of Evidence Level III, retrospective comparative study.",
author = "Parada, {Stephen Arthur} and Eichinger, {Josef K.} and Dumont, {Guillaume D.} and Burton, {Lauren E.} and Coats-Thomas, {Maggie S.} and Daniels, {Stephen D.} and Sinz, {Nathan J.} and Provencher, {Matthew T.} and Higgins, {Laurence D.} and Warner, {Jon J.P.}",
year = "2017",
month = "2",
day = "1",
doi = "10.1016/j.arthro.2016.06.023",
language = "English (US)",
volume = "33",
pages = "254--260",
journal = "Arthroscopy - Journal of Arthroscopic and Related Surgery",
issn = "0749-8063",
publisher = "W.B. Saunders Ltd",
number = "2",

}

TY - JOUR

T1 - Comparison of Glenoid Version and Posterior Humeral Subluxation in Patients With and Without Posterior Shoulder Instability

AU - Parada, Stephen Arthur

AU - Eichinger, Josef K.

AU - Dumont, Guillaume D.

AU - Burton, Lauren E.

AU - Coats-Thomas, Maggie S.

AU - Daniels, Stephen D.

AU - Sinz, Nathan J.

AU - Provencher, Matthew T.

AU - Higgins, Laurence D.

AU - Warner, Jon J.P.

PY - 2017/2/1

Y1 - 2017/2/1

N2 - Purpose To evaluate glenoid version and humeral subluxation on preoperative multiplanar imaging of patients who underwent surgery for posterior glenohumeral instability compared with a matched group of patients who had shoulder surgery for other pathology. Methods All patients over a 2-year period who underwent surgery for posterior instability had preoperative magnetic resonance (MR) imaging or MR arthrogram reviewed. Patients undergoing shoulder surgery for reasons other than instability were identified as a control group and matched by sex, laterality, and age. Measurement of glenoid version and percentage of humeral subluxation was performed by 2 reviewers after completing a tutorial. Reviewers were blinded to diagnosis and to whether or not the patients were in the experimental or control group. Results There were 41 patients in each group. The average glenoid version in the control group was 5.6° of retroversion (standard deviation [SD] 3.0), and the average humeral subluxation was 54% (SD 5.1%). In the experimental group, the average glenoid version was 8.1° of retroversion (SD 5.0). The average humeral subluxation in the experimental group was 56% (SD 6.8%). Student t test revealed a statistically significant difference in glenoid version (P = .009) but not humeral subluxation (P = .25). Intra- and inter-rater reliability was measured by the intraclass correlation coefficient and found to have an excellent Fleiss rating with regard to both measurements. Conclusions Glenoid retroversion is significantly increased in patients with symptomatic posterior labral tears compared with a control group. However, there was no statistically significant difference between the groups with regard to posterior humeral subluxation and, therefore, is not a reliable indicator of the presence or absence of symptomatic posterior shoulder instability. Level of Evidence Level III, retrospective comparative study.

AB - Purpose To evaluate glenoid version and humeral subluxation on preoperative multiplanar imaging of patients who underwent surgery for posterior glenohumeral instability compared with a matched group of patients who had shoulder surgery for other pathology. Methods All patients over a 2-year period who underwent surgery for posterior instability had preoperative magnetic resonance (MR) imaging or MR arthrogram reviewed. Patients undergoing shoulder surgery for reasons other than instability were identified as a control group and matched by sex, laterality, and age. Measurement of glenoid version and percentage of humeral subluxation was performed by 2 reviewers after completing a tutorial. Reviewers were blinded to diagnosis and to whether or not the patients were in the experimental or control group. Results There were 41 patients in each group. The average glenoid version in the control group was 5.6° of retroversion (standard deviation [SD] 3.0), and the average humeral subluxation was 54% (SD 5.1%). In the experimental group, the average glenoid version was 8.1° of retroversion (SD 5.0). The average humeral subluxation in the experimental group was 56% (SD 6.8%). Student t test revealed a statistically significant difference in glenoid version (P = .009) but not humeral subluxation (P = .25). Intra- and inter-rater reliability was measured by the intraclass correlation coefficient and found to have an excellent Fleiss rating with regard to both measurements. Conclusions Glenoid retroversion is significantly increased in patients with symptomatic posterior labral tears compared with a control group. However, there was no statistically significant difference between the groups with regard to posterior humeral subluxation and, therefore, is not a reliable indicator of the presence or absence of symptomatic posterior shoulder instability. Level of Evidence Level III, retrospective comparative study.

UR - http://www.scopus.com/inward/record.url?scp=84992417343&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84992417343&partnerID=8YFLogxK

U2 - 10.1016/j.arthro.2016.06.023

DO - 10.1016/j.arthro.2016.06.023

M3 - Article

C2 - 27599823

AN - SCOPUS:84992417343

VL - 33

SP - 254

EP - 260

JO - Arthroscopy - Journal of Arthroscopic and Related Surgery

JF - Arthroscopy - Journal of Arthroscopic and Related Surgery

SN - 0749-8063

IS - 2

ER -