Predictive Factors Associated With Short-Term Clinical Outcomes and Time to Return to Activity After Arthroscopic Partial Meniscectomy in Nonathletes

BACKGROUND: Although arthroscopic partial meniscectomy is a widely implemented surgical procedure, studies investigating the time to return to activity (RTA) are rare. PURPOSE: To explore which factors are associated with the RTA times after arthroscopic partial meniscectomy and to investigate whether those factors can also improve short-term patient-reported outcomes. STUDY DESIGN: Case-control study; Level of evidence, 3. METHODS: The authors reviewed the records of patients who underwent isolated partial meniscectomy in their institution from January 2017 to December 2019. Patient and injury characteristics were documented, and time to RTA was obtained via phone interview in January 2021. Pre- and postoperative outcomes were assessed with the Lysholm score and International Knee Documentation Committee (IKDC) score. The chi-square test and independent-samples t test were used to evaluate differences in outcome scores and time to RTA according to the patient and injury characteristics, and risk factors with a P value <.1 in the univariate analysis were used in the binary regression. RESULTS: Included were 215 patients (87 men and 128 women; mean age, 33.7 years [range, 24-75 years]). Of these patients, 204 provided information on time to RTA (mean, 3.3 months). By 3 months postoperatively, 49.5% (101/204) of patients could perform activities without knee-related restriction; this improved to 69.6% (142/204) at 6 months and 90.2% (184/204) at 12 months. On multivariate logistic regression analysis, age (OR, 0.39; 95% CI, 0.21-1.19; P = .044) and injury duration (OR, 0.20; 95% CI, 0.19-1.07; P = .032) were significantly associated with the time to RTA. IKDC scores improved significantly from 41.2 preoperatively to 76.7 postoperatively, and in the multivariate logistic regression model, female sex (OR, 2.67; 95% CI, 1.10-6.47; P = .030), body mass index (BMI) ≥27 kg/m(2) (OR, 2.96; 95% CI, 1.02-8.66; P = .047), and medial meniscal tear (OR, 0.20; 95% CI, 0.04-1.00; P = .050) were associated with inferior outcome scores. CONCLUSION: Patients aged 40 years and younger who underwent partial meniscectomy surgery within 6 months after a meniscal tear were more likely to have a shorter time to RTA, and female patients with obesity (BMI ≥27 kg/m2), especially those with medial meniscal tears, tended to have inferior clinical outcomes.