A
Increased anterior tibial translation during the Lachman test.
B
Decreased contact area with increased peak contact pressures, biomechanically equivalent to a total meniscectomy.
C
Increased varus laxity at 30 degrees of knee flexion.
D
Progressive attenuation of the medial collateral ligament (MCL).
Explanation:A complete posterior root tear disrupts the meniscal hoop stresses, rendering the meniscus completely nonfunctional. This leads to a loss of load distribution, resulting in peak contact pressures equivalent to a total meniscectomy. Reference: Allaire et al., 'Biomechanical consequences of a tear of the posterior root of the medial meniscus', J Bone Joint Surg Am (2008).