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Background: Previous research has found that the incidence of neurovascular injury is greatest among multiligamentous knee injuries (MLKIs) with documented knee dislocation (KD). However, it is unknown whether there is a comparative difference in functional recovery based on evidence of a true dislocation. Purpose: To determine whether the knee dislocation-3 (KD3) injury pattern of MLKI with documented tibiofemoral dislocation represents a more severe injury than KD3 MLKI without documented dislocation, as manifested by poorer clinical outcomes at long-term follow-up. Study Design: Cohort study; Level of evidence, 3. Methods: A multicenter retrospective cohort study was performed of patients who underwent surgical treatment for KD3 MLKI between May 2012 and February 2021. Outcomes were assessed using the International Knee Documentation Committee (IKDC) score, Lysholm score, Tegner activity scale, and visual analog scale (VAS) for pain. Documented dislocation was defined as a radiographically confirmed tibiofemoral disarticulation, the equivalent radiology report from outside transfer, or emergency department documentation of a knee reduction maneuver. Subgroup analysis was performed comparing lateral (KD3-L) versus medial (KD3-M) injuries. Multivariable linear regression was conducted to determine whether documented dislocation was predictive of outcomes. Results: A total of 42 patients (25 male, 17 female) were assessed at a mean 6.5-year follow-up (range, 2.1-10.7 years). Twenty patients (47.6%) were found to have a documented KD; they reported significantly lower IKDC (49.9 vs 63.0; P =.043), Lysholm (59.8 vs 74.5; P =.023), and Tegner activity level (2.9 vs 4.7; P =.027) scores than the patients without documented dislocation. VAS pain was not significantly different between groups (36.4 vs 33.5; P =.269). The incidence of neurovascular injury was greater among those with documented dislocation (45.0% vs 13.6%; P =.040). Subgroup analysis found that patients with KD3-L injuries experienced a greater deficit in Tegner activity level than patients with KD3-M injuries (Δ: –3.4 vs −1.2; P =.006) and had an increased incidence of neurovascular injury (41.7% vs 11.1%; P =.042). Documented dislocation status was predictive of poorer IKDC (β = −2.15; P =.038) and Lysholm (β = −2.85; P =.007) scores. Conclusion: Patients undergoing surgical management of KD3 injuries with true, documented KD had significantly worse clinical and functional outcomes than those with nondislocated joints at a mean 6.5-year follow-up. The current MLKI classification based solely on ligament involvement may be obscuring outcome research by not accounting for true dislocation. [ABSTRACT FROM AUTHOR]

Background: The posterolateral corner (PLC) of the knee comprises important static and dynamic stabilizers, including the lateral collateral ligament, popliteus tendon, biceps femoris tendon, the popliteofibular ligament, and the posterolateral capsule. These structures are disrupted in many knee injuries, yet may be overlooked due to the complex anatomy, subjective clinical diagnostic exams, and poorly defined imaging techniques. Complete PLC lesions rarely heal with non-operative treatment, and can lead to significant instability and poor outcomes, and are therefore most successfully treated surgically. Indications: A thorough physical examination and a high index of suspicion is necessary when evaluating the knee to identify these occult injuries. Current physical exam testing for PLC injuries typically includes side to side comparisons of the varus stress test, dial test, and heel-to-table distance. However, these injuries continue to be under-diagnosed as global clinical consensus for PLC injury identification remains elusive. Technique Description: In these videos, we show the "active external rotation sign" where chronic posterior cruciate ligament-PLC deficient patients are positioned in 90° of knee flexion and are instructed to actively contract their hamstrings. Verbal cues given to the patient include "contract your hamstrings" and "dig the back of your heel into the ground." This can result in dynamic external rotation of the tibia with simultaneous posterior tibial translation on the femur. The biceps femoris pulls on the fibula and without the PLC to stabilize the knee, tibiofibular external rotation and posterior translation occurs. The biomechanics are similar to the dial test, but this detection tool utilizes active motion instead of passive motion, and presents with this abnormal and asymmetric knee motion. Results: The purpose of this presentation is to describe and demonstrate an important clinical sign that may be seen with chronic PLC injuries and that may be used as a new test for diagnosis. Discussion/Conclusion: Detection of PLC injuries with the active external rotation sign may assist in the clinical detection of incompetent PLC function, which can put cruciate reconstruction surgery at risk of failure if not simultaneously addressed. Patient Consent Disclosure Statement: The author(s) attests that consent has been obtained from any patient(s) appearing in this publication. If the individual may be identifiable, the author(s) has included a statement of release or other written form of approval from the patient(s) with this submission for publication. [ABSTRACT FROM AUTHOR]

To determine if posteromedial tibial plateau (PMTP) bone bruising on pre-operative MRI is significantly associated with a ramp lesion identified during arthroscopy in patients with concomitant ACL ruptures. PubMed, CINAHL, Scopus, Web of Sciences, EMBASE, and Cochrane Library were searched systematically for studies that investigated the association between PMTP bone bruises on preoperative MRI and ramp lesions confirmed during arthroscopy. Eight studies met inclusion criteria. The Methodological Index for Nonrandomized Studies (MINORS) checklist was used to assess quality. A meta-analysis was performed to analyze odds of a ramp lesion after PMTP bone bruising identified on magnetic resonance imaging (MRI). Publication bias was assessed by funnel plot and Egger's linear regression test. There are 2.05 greater odds of medial meniscal ramp lesions in patients with an ACL rupture when PMTP bone bruising is found on preoperative MRI (95% CI, 1.29–3.25; p = 0.002). Heterogeneity of the pooled studies may be substantial (I2 = 65%; p = 0.006). Funnel plot analysis and Egger's linear regression test (p > 0.5) determined no publication bias among the studies included in the meta-analysis. Patients with acute ACL injuries and PMTP bone bruising on MRI have 2.05 times greater odds of a concomitant medial meniscal ramp lesion than those without this bone bruise pattern. [ABSTRACT FROM AUTHOR]