Table 1

Baseline characteristics of participants based on IPFP signal intensity alteration

 IPFP signal intensity alterationIPFP signal intensity alterationp Value
NoYes
N=443N=431
Age (year)61.3 (7.3)63.0 (7.2)0.001
Female sex (%)57.342.7<0.001
BMI (kg/m²)27.5 (4.9)28.0 (4.4)0.119
Medial tibial cartilage volume (mL)2.2 (0.6)2.4 (0.6)0.004
Lateral tibial cartilage volume (mL)2.7 (0.7)2.8 (0.7)0.025
Patella cartilage volume (mL)3.2 (0.9)3.3 (1.0)0.372
Medial tibial bone area (cm²)20.4 (3.0)21.4 (3.0)<0.001
Lateral tibial bone area (cm²)11.8 (2.0)12.5 (2.2)<0.001
Medial joint space narrowing (%)50.455.30.158
Lateral joint space narrowing (%)24.722.80.534
MTF osteophytes (%)5.78.70.098
LTF osteophytes (%)2.75.00.096
BML present (%)28.244.5<0.001
MTF cartilage defects (%)21.126.20.075
LTF cartilage defects (%)16.426.5<0.001
Patellar cartilage defects (%)32.445.9<0.001
Knee pain (%)47.152.20.128
Radiographic osteoarthritis (%)55.662.30.052
  • Two-tailed t tests were used for differences between means, and χ2 tests were used for proportions (percentages). Significant differences are shown in bold. Mean (SD) except for percentages.

  • BMI, body mass index; BML, bone marrow lesions; IPFP, infrapatellar fat pat; LTF, lateral tibiofemoral; MTF, medial tibiofemoral.