ACL avulsion fracture

Case contributed by Ammar Haouimi

Diagnosis almost certain

Citation, DOI, disclosures and case data

Citation:

Haouimi A, ACL avulsion fracture. Case study, Radiopaedia.org (Accessed on 19 Apr 2024) https://doi.org/10.53347/rID-90844

DOI:

https://doi.org/10.53347/rID-90844

Permalink:

https://radiopaedia.org/cases/90844?iframe=true

rID:

90844

Disclosures:

At the time the case was submitted for publication Ammar Haouimi had no recorded disclosures.

Case published:

9 Jul 2021

Revisions:

2 times, by 1 contributor - see full revision history and disclosures

Systems:

Musculoskeletal

Tags:

acl avulsion fracture, osteochondral fracture, patella alta

Institution:

Aurès Medical Imaging Center - Batna Algeria

Quiz mode:

Included

Road traffic accident.

Age: 16 years

Gender: Male

From the case: ACL avulsion fracture

mri

The MRI sequences demonstrate:

avulsion-fracture involving the majority of the tibial eminence at the tibial insertion of the ACL with complete separation of the bony fragments.
swollen with edema of the ACL attached to the bone fragment
bone marrow edema of the tibial epiphysis
osteochondral fracture with bone marrow edema of the lateral femoral condyle
moderate knee joint effusion
lateral displacement of the patella with patella alta (Modified Insall-Salvati ratio = 2.25) with small size of the medial facet and concave aspect of the lateral facet (Wiberg type 2 or b).
both menisci, collateral ligaments as well as the medial and lateral patellar retinaculum are intact

MRI features of an ACL avulsion-fracture type 3b according to Meyers and McKeevers classification with associated osteochondral fracture of the lateral femoral condyle.