Initial MRI scan following acute injury (fall while rollerblading)
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Complete disruption to the anterior cruciate at its femoral attachment (arrow). The posterior cruciate remains intact.
On the medial side there is a large horizontal cleavage tear involving the meniscus extending predominantly into the posterior horn. Articular cartilage is preserved. There is partial disruption to the medial collateral ligament posteriorly at its femoral attachment.
On the lateral side meniscus and articular cartilage are normal. There is, however, a definite crack fracture involving the lateral femoral condyle. No deformity. Lateral collateral ligament and posterolateral corner structures are normal including popliteus.
Minor chondromalacia involves the apex of the patellar facet. Moderate joint effusion. Small Baker cyst.
This patient has had a substantial valgus force injury with complete disruption to the anterior cruciate ligament, marked horizontal cleavage tearing of the medial meniscus, possibly minor disruption to the medial collateral ligament and an undisplaced crack fracture involving the lateral femoral condyle together with minor bone bruising on the posterior aspect of the lateral tibial plateau.