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Table 1 Characteristics of patients with early-stage knee osteoarthritis

From: Association of medial meniscal extrusion with medial tibial osteophyte distance detected by T2 mapping MRI in patients with early-stage knee osteoarthritis

Characteristics Data
Number of subjects 50
Age, years 57.0 (15.1)
BMI, kg/cm2 24.1 (3.9)
Sex, M/F 23/27
Radiography
 K/L grade 0/1/2 3/27/20
 Femorotibial angle, degrees 178.4 (2.6)
 Medial joint space width, mm 3.7 (0.9)
Proton density-weighted MRI (MTFJ)  
 WORMS
  Cartilage (0–30) 11.9 (6.8)
  Osteophyte (0–35) 4.4 (5.1)
  Bone marrow lesion (0–15) 1.0 (1.9)
  Subchondral bone cyst (0–15) 2.5 (4.4)
  Subchondral bone attrition (0–15) 1.3 (1.5)
  Medial meniscus lesion (0–6) 2.2 (1.6)
 Medial meniscus
  MME, mm 3.0 (1.6)
  Tears, n 15
  Root tear, n 0
T2 mapping MRI (MTFJ)  
 T2 value of medial meniscus 22.0 (2.8)
 Medial femoral osteophyte distance
  Bone part + cartilage part, mm 2.1 (1.4)
  Bone part, mm 1.3 (0.9)
  Cartilage part, mm 0.8 (0.8)
 Medial tibial osteophyte distance
  Bone part + cartilage part, mm 3.3 (1.9)
  Bone part, mm 1.8 (1.4)
  Cartilage part, mm 1.5 (1.5)
Osteophyte prevalence (MTFJ)  
 Radiograph 40.0%
 Proton density-weighted MRI 48.0%
  K/L 0 0%
  K/L 1 44.4%
  K/L 2 60.0%
 T2 mapping MRI 98.0%
  K/L 0 100%
  K/L 1 96.7%
  K/L 2 100%
  1. Abbreviations: BMI Body mass index, K/L Kellgren-Lawrence classification, MFTJ Medial tibiofemoral joint, MME Medial meniscal extrusion, MRI Magnetic resonance imaging, WORMS Whole-Organ Magnetic Resonance Imaging Score
  2. The femorotibial angle and the medial joint space width of the knee joints were determined at the center point of the medial femorotibial compartment on a radiograph. Osteophytes observed by radiograph and MRI were defined as the presence of K/L grade ≤ 2 and the presence of WORMS grade ≤ 2, respectively. The data are expressed as mean (SD), count, or percent