Transcript B3-Sat-2-2-Leaper

Sat 31st Aug 2013
Session 2 / Talk 2
10:55 – 11:06
BROOKLYN 3
MRI USER GROUP
Gareth LEEPER
ABSTRACT
Magnetic Resonance Imaging of the Hip under traction.
One of the more difficult aspects of diagnosing causes of hip pain on MRI is to
clearly identify early degenerative change in the cartilage. The application of
traction to the limb being imaged allows for expansion of the joint and excellent
delineation of cartilage margins of both the femoral head and acetabulum. It will
only work once the joint has been decompressed following an arthrographic
procedure. We have been performing Hip arthrograms using this technique for 3
months with some success. It is dependent on patient co-operation and good
staff technique. The resultant images in successful cases are excellent
Femoral !!!
Fatal A Traction
Gareth Leeper
Manager of MRI Services
Christchurch Radiology Group
Initial setup
Attaching leg traction device
At CRG we have been applying
traction to our Hip Arthrograms with
some success
20cm FOV 288x288 4mm
20cm FOV 288x288 3mm
20cm FOV 288x288 4mm
Imaging performed in addition
 Measuring Femoral rotation:
Schematic diagrams of the right femur and acetabulum show how abnormal femoral
antetorsion might contribute to the development of FAI. Left: Markedly reduced femoral
antetorsion with smaller amplitude at internal rotation, which may lead to an increased mec...
Sutter R et al. Radiology doi:10.1148/radiol.12111903
©2012 by Radiological Society of North America
 3D Modelling of the upper femur to
determine Femoral Acetabular Impingement
T2 mapping
Multi echoes allow demonstration of T2 variations in cartilage
Healthy cartilage highly structured matrix low T2 signal
As collagen fibres degenerate water molecules less
restricted higher T2 signal
Future possibilities
 Delayed gadolinium enhanced MRI of
cartilage (dGEMRIC)
Glycosaminoglycans (GAGs) in normal cartilage
Negatively charged repel Gadolinium ions
T1 map multi inversion technique
< GAD = >GAG
Diary Date 2014
Please make a note in your diaries / phones today
NZ MR User Group study day
Saturday March ??? 2014
Auckland
?? Cardiovascular focus ??
These will be run biannually in Auckland and Christchurch initially but will
consider running them in other centres if demand is high enough