Case 19 - 28 year old female with knee pain following ACL reconstruction
28 year old female with right ACL reconstruction one year prior, now with two weeks of worsening knee pain.
- Much like our previous patients the reconstructed ACL appears intact. The position and appearance of the femoral and tibial tunnel also appear normal.
- A small low signal intensity soft tissue mass is seen anterolateral to the tibial insertion of the reconstructed ACL compatible with anterior arthrofibrosis or a small cyclops lesion.
- Cyclops lesions occur in approximately 5% of patients following ACL reconstruction, and if symptomatic require arthroscopic resection.
- This patient has another interesting finding, which may also cause symptoms of pain and catching: a discoid lateral meniscus. Scroll through the lateral meniscus in both coronal and sagittal planes comparing it to the medial meniscus. Normally the body of the meniscus is only seen on two adjacent sagittal slices; in this patient it is seen on nearly five!
- A discoid meniscus is a common anatomic variant finding occurring in up to 5% of the population, but is prone to degeneration and subsequent tearing; it more commonly affects the lateral meniscus and more commonly occurs in women.
Accession: CL0067
Study description: MR KNEE RIGHT
Case discussion: