title: Correlation of MR arthrographic findings and range of shoulder motions in patients with frozen shoulder.
abstract: OBJECTIVE
  The purpose of this article is to correlate MRI arthrographic findings with range of shoulder motions in patients with frozen shoulder.
  
  
  METHODS
  Shoulder MRI studies of 40 patients (22 women and 18 men; mean age, 52.8 years) with frozen shoulder were retrospectively compared with MRI studies of 40 age- and sex-matched control subjects without frozen shoulder. The thickness of the coracohumeral ligament and the capsule in axillary recess were measured retrospectively. The range of shoulder motions, including external rotation (ER), internal rotation (IR), lateral abduction, and forward flexion (FF), were prospectively evaluated by one experienced orthopedic surgeon.
  
  
  RESULTS
  The mean (±SD) thickness of the coracohumeral ligament (4.13±1.04 vs 2.51±0.59 mm; p=0.000) and the capsule in axillary recess (3.97±1.45 vs 2.33±0.87 mm; p=0.000) were significantly greater in the patient group than in the control group. Multiple linear regression showed that only coracohumeral ligament thickness was significantly associated with ER (R2=0.418; p=0.000) and IR (R2=0.346; p=0.001), but not with lateral abduction and FF. Capsular thickness in axillary recess was not significantly correlated with any shoulder motion.
  
  
  CONCLUSIONS
  Coracohumeral ligament thickness on MR arthrography correlates with the range limitation of ER and IR in patients with frozen shoulder.
authors.affiliation: Department of Radiology, Yeouido St. Mary's Hospital, The Catholic University of Korea, 62 Yeouido-dong, Yeongdeungpo-gu, Seoul 150-713, Republic of Korea.
authors.forename: So-Yeon
authors.initials: SY
authors.lastname: Lee
authors.forename: Jeongmi
authors.initials: J
authors.lastname: Park
authors.forename: Seok-Whan
authors.initials: SW
authors.lastname: Song
mesh_terms: D000328:Adult; D000368:Aged; D002062:Bursitis / Q000175:diagnosis* / Q000503:physiopathology*; D016022:Case-Control Studies; D003287:Contrast Media; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D007472:Iohexol; D016014:Linear Models; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D016059:Range of Motion, Articular / Q000502:physiology*; D012189:Retrospective Studies; D012399:Rotation; D012785:Shoulder Joint / Q000503:physiopathology*
chemical_list: D003287:Contrast Media; D007472:Iohexol; D019786:Gadolinium DTPA