title: Forearm interosseous membrane imaging and anatomy.
abstract: OBJECTIVE
  To determine the regional thickness variation of the interosseous membrane (IOM) along the forearm and validate magnetic resonance imaging of the IOM with laser micrometry.
  
  
  METHODS
  Axial thickness measurements of 12 cadaver forearms were obtained using magnetic resonance imaging (MRI) at radial, central, and ulnar locations. The specimens were dissected, and IOM thickness measured using a laser micrometer. MRI and laser measurements of the main and oblique IOM bundles were compared. An axial thickness profile was plotted versus forearm length, and radial, central, and ulnar positions were compared.
  
  
  RESULTS
  The main bundle thickness was 2.18+/-0.20 mm using laser micrometry, which was not significantly different from MRI measurements (1.86+/-0.25 mm, p=0.11, power = 0.84). The dorsal oblique bundle thickness was not significantly different between measurement methods (2.93+/-0.77 mm and 3.30+/-1.64 mm using laser micrometry and MRI respectively, p=0.75, power = 0.04). Both methods demonstrated a progressive increase in thickness proximally within the forearm. MRI measurements demonstrated a significantly greater thickness increase in the radial location compared to the central location (slope = 2.26 and 1.05, r(2)=0.31 and 0.12 respectively, p<0.05). The ulnar slope was not significantly different from zero ( r(2)=0.02, p>0.05).
  
  
  CONCLUSIONS
  Our findings describe the varying IOM anatomy using MRI, and determined the location of the clinically important IOM fiber bundles. This study confirms the accuracy of MR imaging of the IOM by comparison with a laser micrometer, and demonstrates the thickness variation along the forearm. This information may be used to identify changes in IOM anatomy with both acute IOM injury and chronic fiber attenuation.
authors.affiliation: School of Medicine, Temple University, Philadelphia, PA 19140, USA.
authors.forename: Joseph C
authors.initials: JC
authors.lastname: McGinley
authors.forename: Neil
authors.initials: N
authors.lastname: Roach
authors.forename: John P
authors.initials: JP
authors.lastname: Gaughan
authors.forename: Scott H
authors.initials: SH
authors.lastname: Kozin
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002102:Cadaver; D004210:Dissection; D005542:Forearm / Q000033:anatomy & histology*; D006801:Humans; D007834:Lasers; D008279:Magnetic Resonance Imaging; D008566:Membranes / Q000033:anatomy & histology; D008875:Middle Aged; D018485:Muscle Fibers, Skeletal / Q000166:cytology; D018482:Muscle, Skeletal / Q000033:anatomy & histology*; D011884:Radius / Q000033:anatomy & histology; D014457:Ulna / Q000033:anatomy & histology