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METHODS: 75 patients (n= 26 bone-patellar-tendon-bone, 27 quadriceps tendon and 22 hamstring grafts; 78.3 ± 17.9 kg, 175.3 ± 9.4 cm) were assessed at 12 months following ACLr. A performance assessment was completed including three repetitions of a DVJ from a 30 cm box to two forces plates at 50% of the patient's height from the platform. Five repetitions of concentric isokinetic knee extension at 90 o /s were completed thereafter. Peak vertical GRF were determined during the initial landing, take-off, and secondary landing phases and averaged over three trials. One and two-way ANOVAs were used to determine the effect of graft type on torque, GRF and LSI values, and linear regression to test the relationship between quadriceps affected limb torque and LSI with DVJ GRF LSI. RESULTS: Quadriceps strength was reduced on the affected limb (p < 0.001) and the quadriceps limb symmetry index (LSI) did not vary by graft (p = 0.173). Similarly, affected limb GRF was reduced (p < 0.001) with no interaction of limb, graft and DVJ phase, and GRF LSI did not vary by graft or phase (p = 0.872). Affected limb torque and concentric quadriceps LSI explained 8.1% (p = 0.008) and 9.7% (p = 0.004) of take-off LSI variance, but not in the initial or subsequent landing phases of the DVJ task. CONCLUSIONS: Concentric quadriceps strength and symmetry hold limited explanatory power in GRF patterns at one-year following ACLr. Future work should consider alternate contraction modes and other outcomes that may explain compensatory movements during the DVJ task, including task-specific measures of confidence or other psychological outcomes.

Background: The prevalence and demand for total joint arthroplasty (TJA) in patients with human immunodeficiency virus (HIV) and hepatitis C (HCV) have steadily increased. However, the relationship between these immunocompromising viruses and perioperative complications such as postoperative infection has yet to be fully established. Methods: TJA was performed in 109 immunocompromised (IC) patients (50 THAs and 59 TKAs) between 2008 and 2014. Patients were matched based on sex, age, body mass index, and operation (TKA vs. THA) to patients who were nonimmunocompromised (N-IC). A cohort of 66 IC patients were also matched with 66 N-IC based on medical comorbidities to assess for medical comorbidities that may increase the risk of infection. Results: The overall complication rate in the IC group and N-IC groups was 20% (22 patients) and 14.6% (16 patients), respectively, which was not statistically significant (P=0.34). There were no differences between the two groups in the incidence of deep (n=6; 5.5% vs. n=3; 2.7%; P=0.36) or superficial infections (n=4; 2.1% vs. n=1; 0.9%; P=0.50), or re-admissions (n=12; 11% vs. 14; 12.8%; P=0.80). However, there was a significant difference for reoperation (16 vs. 6, P=0.04). When data were adjusted for confounding factors for complications, matched for comorbidities, the rate of infection and reoperation were 7.5% and 4.5% in IC and 9% and 6% in N-IC groups, respectively, which were not statistically significant. Conclusions: IC patients were not at a significant increased risk for perioperative complications, postoperative infections, or readmissions, but they were at higher risk of reoperation.