الفهرس 
Anatomy of the knee jointOnly 14 pages are availabe for public view
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Abstract
Anterior cruciate ligament is the most commonly injuried ligament in knee joint and the most common ligament that can be reconstructed .
Clinical evaluation of ACL reconstruction can be difficult , so MRI plays an important role in evaluation of ACL graft integrity, as well as the diagnosis of complications associated with its recostruction.
Our study was conducted to show the role of MRI in assessment of post operative ACL reconstruction. This study included 100 patients (94 males & 6 females ), the age ranged between 17 and 55 years. All patients presented with history of ACL reconstruction.
All patients were subjected to clinical history followed by MRI examination. MRI examination of the knee was performed in axial, coronal and sagittal planes, surface coil was applied. Different MR sequences were used such as T1, T2, PD and fat suppressed images.
Our study showed that the commonest post ACL reconstruction complication was osteoarthritis being noticed in 21 patients (21%). The 2nd most common complication was complete graft tear which was observed in 15 patients (15%). This was explained by the concomitant history of re-injury in these cases.
The least common complications were graft laxity and ilio-tibial band syndrome; each was seen in one case representing only 1% for each.
The primary and secondary signs of ACL gaft tear were assessed in our study. Complete discontinuity and focal thinning of graft fibers were found to be valuable for differentiating between complete and partial tear, while increased graft
Summary & Conclusion
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signal intensity was found to be the least valuable sign for differentiating between them.
Our study showed that 35% of cases were associated with ACL graft failure, 25.7 % showed abnormal tibial tunnel position and 71.4% showed high signal intensity within the graft.
Our study showed that the main cause for graft impingement was the abnormal position of the tibial tunnel. 6% of the patients diagnosed as having graft impingement showed abnormal position of the tibial tunnel (anterior to the Blumensaat line).
from our study we may finally conclude that MRI is the gold standard method for evaluation of post operative ACL reconstruction as it plays an important role not only in assessment of graft integrity, but also in assessment of graft failure and detection of the post operative ACL reconstruction complications.
We also conclude that assessment of tunnel position is very important for detection of graft failure. Also increased signal intensity within the graft is a very specific sign in detection of graft failure although it is the least valuable sign in differentiating between complete and partial graft tear.