Disclosure

The authors have no financial relationships to disclose.

Introduction

MRArthrography vs. MRI

Labral tears MRA 91% accuracy vs MR 36%.

Czerny et Al, 1996

Moderate sensitivity in cartilage lesions

Schmid et al 2003

Radial MRA Displays the labrum

in cross section circumferentially in 360 degrees around entire acetabulum .

Higher accuracy for the labrum 85% vs parallel cuts 70%.

G. M. J. Plötz et al 2001

3

12

6

9

Cam lesions and alpha angles can be measured all round the femoral head & neck.

Aim

Detection sensitivity & accuracy of Radial MRA in detection of labral tears and cartilage lesions.

Results correlated with arthroscopic findings.

LB

Radial MRA: showing labral tear at 2 clock and arthroscopic finding.

Cartilage Delamination

MRA: Dye seen behind the labrum & cartilage, delamination confirmed on arthroscopy

rMRA vs Arth in Labral Tears

Arthroscopy negative Arthroscopy positive (FP) 2 (TP ) 16 MRA positive 18 (TN) 3 (FN) 0 MRA negative 3

Arthroscopy negative Arthroscopy positive (FP) 2 (TP ) 13 MRA positive 15 (TN) 6 (FN) 0 MRA negative 0

rMRA vs Arth in Cartilage lesions Sensitivity=100% & accuracy 90%

Sensitivity=100% & accuracy 90.5%

Conclusion

Radial MRA has shown a 100% sensitivity and 90% accuracy in detection of labral tears and cartilage lesions.

In addition to identifying the pathology, it aids in exact localization during hip arthroscopy.

Ref.

Blankenbaker et al. Classification and localization of labral tears. Skeletal Radiol 2007

Chan YS et al, Evaluating Hip labral tears using MRA: Prospective study comparing Hip Arthroscopy and MRA diagnosis. Arthroscopy 2005

Czerny C, H. S. Lesions of the acetabular labrum: accuracy of MR imaging and MR arthrography in detection and staging. Radiology . 1996

Leunig M, et al. Evaluation of the acetabular labrum by MRA. JBJS Br, 1996

Plötz GM,. MRA of the acetabular labrum: value of radial reconstructions. Arch Orthop Trauma Surg 2001