Characterization of glenoid bone remodeling in professional baseball pitchers.

Abstract:

OBJECTIVE:To characterize the appearance, location, severity, and prevalence of focal glenoid retroversion on shoulder MRI in professional baseball pitchers versus age-matched controls. MATERIALS AND METHODS:In this retrospective review, two musculoskeletal radiologists evaluated shoulder MRI examinations from 40 professional baseball pitchers and 40 age-matched controls. Images were scored for the presence of a focal posterior glenoid convexity and the clock face positions involved. A consensus interpretation was also performed. A third reader identified the presence of additional shoulder abnormalities. RESULTS:After consensus, 60% (24/40) of pitchers were found to have focal glenoid retroversion versus 20% (8/40) of controls (p = 0.001). The most apparent location was posterior or posterior-superior, from 7.75 o'clock to 10.5 o'clock (median, 9.75 o'clock; interquartile range, 9.25-10 o'clock). The median clock angle of involvement was greater in pitchers than in controls (30° vs. 0°; p < 0.001). Interreader agreement regarding the presence or absence of focal glenoid retroversion was moderate (Cohen's kappa, 0.49). Focal glenoid retroversion was more prevalent among subjects with additional shoulder abnormalities (p = 0.014). CONCLUSIONS:Glenoid remodeling occurs in the throwing shoulder of professional baseball pitchers and manifests as focally convex morphology of the posterior or posterior-superior glenoid. This type of remodeling does not appear to be associated with a lower prevalence of injuries related to posterior-superior impingement.

journal_name

Skeletal Radiol

journal_title

Skeletal radiology

authors

Rassi J,Subhas N,Bullen J,Forney M,Polster J

doi

10.1007/s00256-018-3121-3

subject

Has Abstract

pub_date

2019-07-01 00:00:00

pages

1095-1102

issue

7

eissn

0364-2348

issn

1432-2161

pii

10.1007/s00256-018-3121-3

journal_volume

48

pub_type

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