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  Medical Imaging  ←  MRI of the Knee  ←

Phoenix Diagnostic Clinic

MR evaluation of ACL graft

– Diameter of tunnels: 8-11 mm

After 1 year:
– ACL graft tear similar in
appearance as tear of normal ACL

ACL graft tear

MR evaluation of tunnels position

Soft-tissues changes after ACL graft

Postoperative MR:

– ACL : conventional
– menisci: arthrography
Technical conditions for conventional MR:

Decreasing artifacts
Increased bandwidth (maximum)
Decrease FOV
Increase frequency-encoding matrix
Decrease echo-time
No gradient-echo and no fat suprresion
1.5T better than 3.0 T

PD FSE Fatsat

FOV 200 , TE 29
BW 100
matrix 204

FOV 160 , TE 15
BW 180
Matrix 238

Signal intensity:

– Depends on the time between syrgery and MRI

– Magic angle effects can be eliminated with the knee in flexion

– High-signal normal 1-2 years after surgery

Stockle et al. Int Orthop 1998;22:288

– > 2 years – low signal intensity on all sequences

McCauley TR. Radiology 2005;234:53
MR evaluation of ACL graft

October 16, 2009

Phoenix Diagnostic Clinic, Bucharest

This site is primarily intended for use by qualified medical or sport professionals.
If you are a consumer, you should evaluate the information together with your physician or other qualified healthcare professional.
The information provided here is for educational and informational purposes only and should not be considered as a medical advice.
As medical and sport science is permanently changing, we (authors and publishers) use our best efforts to provide accurate information, but we can not warrant that the information in this article and web site is accurate, complete or up-to-date.
This article reflects the opinions and judgments of it's author and may be further updated.
If you have questions regarding this article, please contact the author.
Information belongs to Phoenix Diagnostic Clinic, Bucharest

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