Anterolateral Rotatory Instability

Description: - defined as excessive forward rotation of tibial plateau w/ excessive lateral opening of the joint;
- there is excessive internal rotation of tibia on femur in flexion;
- as knee extends, subluxation is reduced by the bony stability, and a jerk is noted which is basis for the pivot shift test;
- disrupted structures:
- disruption of ACL
- disruption of lateral supporting structures;
- LCL
- arcuate complex;
Wheeless' Textbook of Orthopaedics