Association between preoperative prognostic nutritional index and perioperative outcomes after unicompartmental knee arthroplasty for medial knee osteoarthritis: A retrospective single-center study.

Compared with patients with PNI ≥48.9, those with PNI <48.9 showed a trend toward lower BMI (26.3 ± 3.2 vs 26.9 ± 3.5, P = .064), higher prevalence of chronic obstructive pulmonary disease (8.7% vs 4.9%, P = .091), a greater proportion of higher American Society of Anesthesiologists grade (III or above: 15.8% vs 9.9%), less intraoperative blood loss (112.5 ± 35.4 vs 126.5 ± 63.7 ml), and significantly lower platelet and red blood cell counts, hematocrit, hemoglobin (P, total cholesterol, triglycerides, and creatinine, as well as higher hs-CRP concentrations.

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