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Table 1 Patients’ baseline characteristics

From: Return to sports activity after opening wedge high tibial osteotomy in patients aged 70 years and older

   Overall  < 70 years  ≥ 70 years *P value
Age, years 68.1 ± 8.1 61.3 ± 5.3 74.8 ± 3.7  
Number of patients 74 36 38  
Male 19 15 4  
Female 55 21 34  < 0.01
Body mass index, kg/m2 25.5 ± 4.6 26.1 ± 5.5 25.0 ± 3.4 0.34
Follow- up period, months 32.9 ± 12.9 33.8 ± 13.7 31.2 ± 12.6 0.18
OA, n 49 27 22  
Grade 1 3 1 2  
  2 28 14 14  
  3 18 12 6 0.40
ON, n 32 14 18  
Stage 1 2 2 0  
  2 0 0 0  
  3 4 2 2  
  4 26 10 16 0.23
  1. * < 70 years vs ≥ 70 years
  2. OA osteoarthritis, ON osteonecrosis
  3. OA grade modified from Ahlbach's classification
  4. ON stage classification described by Koshino