Fig. 2

Three-digit ACL rupture classification. The first digit describes the ACL rupture location: ‘A’ for proximal third, ‘B’ for central third and ‘C’ for distal third. The second digit is the ACL rupture status: ‘1’ for 1 bundle, ‘2’ for 2 bundles and ‘3’ for multilacerated. The third digit describes the ACL synovial tube: ‘1’ for completely intact, ‘2’ for ≥50% intact and ‘3’ for < 50% intact [17]