The following content was supplied by the authors as supporting material and has not been copy-edited or verified by JBJS.

(1)

KAHAN ET AL.

INCREASED VASCULAR AND NEUROLOGIC MORBIDITY IS SEEN IN DOCUMENTED KNEE DISLOCATION VERSUS MULTILIGAMENTOUS

KNEE INJURY

http://dx.doi.org/10.2106/JBJS.20.01151 Page 1

The following content was supplied by the authors as supporting material and has not been copy-edited or verified by JBJS.

Appendix 1: Schenck Classification Class Injury

KD I PCL or ACL intact knee dislocation Variable collateral involvement KD II Both cruciates torn, collaterals intact KD III Both cruciates torn, 1 collateral torn

Subset M (medial) or L (lateral) KD IV All 4 ligaments torn

KD V Knee fracture dislocation

aACL, anterior cruciate ligament; KD, knee dislocation; PCL, posterior cruciate ligament.

bSubtypes: C, arterial injury; N, neurologic injury

(2)

KAHAN ET AL.

INCREASED VASCULAR AND NEUROLOGIC MORBIDITY IS SEEN IN DOCUMENTED KNEE DISLOCATION VERSUS MULTILIGAMENTOUS

KNEE INJURY

http://dx.doi.org/10.2106/JBJS.20.01151 Page 2

Appendix 2: Current Procedural Terminology (CPT) codes associated with the management of a ligamentous knee injury.

CPT-27405 Repair primary torn ligament and/or capsule knee;

collateral

CPT-27409 Repair primary torn ligament and/or capsule knee;

collateral and cruciate ligaments

CPT-27427 Ligamentous reconstruction (augmentation) knee; extra- articular

CPT-27429 Ligamentous reconstruction (augmentation) knee; intra- articular (open) and extra-articular

CPT-27557 Open treatment of knee dislocation with or without internal or external fixation; with primary ligamentous repair CPT-27558

Open treatment of knee dislocation with or without internal or external fixation; with primary ligamentous repair with augmentation/reconstruction

CPT-29888 Arthroscopically aided anterior cruciate ligament repair/augmentation or reconstruction

CPT-29889 Arthroscopically aided posterior cruciate ligament repair/augmentation or reconstruction