Description
An injury of the anteromedial retinaculum was detected in 72.5% to 73.3% of the cases and in 22.5% to 24.2% the retinaculum was completely torn. Injuries of the sMCL and dMCL were detected in 50% and 77.5% of the cases, respectively. Any injury to the POL was observed in 31.7%. However, only in 5.8% of the cases a Grade III injury was seen. No significant (n.s.) correlations were detected between the injury pattern and the age, sex or type of sport (high-risk vs. low-risk). A bony edema adjacent to the femoral dMCL insertion was frequently observed in dMCL injuries.
Medial meniscus injuries were associated with lesions of the sMCL and the anteromedial retinaculum (p<0.05), while lateral meniscus injuries were significantly more often seen in patients with a dMCL rupture (p<0.05).
Data of this study suggest that injuries to the anteromedial knee structures are much more frequent compared to posteromedial lesions in subjects with an ACL injury. However, current diagnostic tools and reconstructive techniques do not account for anteromedial injuries and an AMRI. Whether these injuries are associated with excess AMRI is still unclear.
