The drive-through sign is when the arthroscopic surgeon during the arthroscopy sees an abnormally big space at the back of the knee joint on the lateral side.
Significance of the Drive-Through sign
A 'drive-through' sign is an indication of damage to structures in the posterolateral corner of the knee.
The "lateral gutter drive-through" sign: an arthroscopic indicator of acute femoral avulsion of the popliteus tendon in knee joints. Feng H, Zhang H, Hong L, Wang XS, Zhang J. Arthroscopy. 2009 Dec;25(12):1496-9. doi: 10.1016/j.arthro.2009.08.005.