Presentation
Left knee injury one week ago. Anterior cruciate ligament repair 10 years ago.
Patient Data
Moderate knee joint effusion.
No acute meniscal tear is identified. Meniscal flounce at the medial meniscal body.
Prior anterior cruciate ligament reconstruction with rupture of the proximal graft. Positive anterior tibial translocation sign. Posterior cruciate ligament is intact.
Grade 1 pattern of edema of the medial collateral ligament. Lateral collateral ligament complex and posterolateral corner are intact.
Quadriceps and patellar tendons are intact. Moderate chondromalacia of the central femoral trochlea. Scarring of Hoffa's fat pad in keeping with prior surgery.
Subchondral bone marrow edema signal at the sulcus terminalis. Mild chondromalacia of the central weight-bearing medial femoral condyle.
Case Discussion
Typical findings of anterior cruciate ligament graft rupture with a low-grade medial collateral ligament injury. The history of trauma, knee joint effusion and lateral sulcus terminalis impaction injury all favor an acute rupture rather than a chronic tear/deficiency.
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