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Table 2 Comparison of patient demographics, VAS, KSS, f KSS, OKS and ROM in BMI groups

From: The effect of morbid obesity (BMI ≥ 35 kg/m2) on functional outcome and complication rate following unicompartmental knee arthroplasty: a case-control study

  Normal and Overweight Obese Morbidly Obese  
  Mean ± s.d./n-% Median Mean ± s.d./n-% Median Mean ± s.d./n-% Median  
Age 61.5 ± 7.3 61.0 60.5 ± 7.7 60.0 59.0 ± 7.1 58.0 0.374K
Sex Female 22 84.6%   32 80.0%   32 84.2%   0.847x2
Male 4 15.4%   8 20.0%   6 15.8%  
Side Right 12 46.2%   24 60.0%   22 57.9%   0.513x2
Left 14 53.8%   16 40.0%   16 42.1%  
Follow-up 42.7 ± 14.1ǂ 36.0 40.6 ± 13.5ǂ 40.0 53.9 ± 12.7 55.0 0.000K
BMI 27.3 ± 2.3 28.0 32.7 ± 1.5 33.1 40.9 ± 5.6 39.0  
VAS
Preoperative 8.9 ± 0.9 9.0 9.2 ± 1.0 10.0 8.8 ± 1.2 9.0 0.232K
Postoperative 1.6 ± 1.9 1.0 2.3 ± 2.4 2.0 3.7 ± 3.8 2.0 0.099K
Change − 7.3 ± 1.9 − 7.0 − 6.9 ± 2.8 − 7.0 − 5.2 ± 4.2 − 6.0 0.195K
Group exchange p 0.000w 0.000w 0.000w
KSS
Preoperative 44.0 ± 4.3 44.0 42.1 ± 11.8 43.5 43.9 ± 9.8 47.0 0.158K
Postoperative 96.3 ± 6.1*ǂ 100.0 88.8 ± 10.8 93.5 75.2 ± 27.2 82.0 0.001K
Change 52.3 ± 6.6ǂ 55.0 46.7 ± 14.6ǂ 48.5 31.2 ± 28.3 45.0 0.005K
Group exchange p 0.000w   0.000w   0.000w   
fKSS 0.0
Preoperative 35.8 ± 22.2 50.0 32.3 ± 21.2 35.0 36.6 ± 13.5 35.0 0.245K
Postoperative 90.0 ± 12.6ǂ 90.0 87.8 ± 12.4ǂ 90.0 70.5 ± 34.0 80.0 0.013K
Change 54.2 ± 18.4ǂ 50.0 55.5 ± 27.7ǂ 60.0 33.9 ± 35.5 45.0 0.015K
Group exchange p 0.000w   0.000w   0.000w   
OKS
Preoperative 11.4 ± 7.8 11.0 11.4 ± 8.0 10.0 15.1 ± 7.0 16.0 0.071K
Postoperative 42.5 ± 4.7ǂ 43.0 39.3 ± 7.2ǂ 40.5 33.1 ± 13.6 40.0 0.011K
Change 31.1 ± 8.6ǂ 30.0 27.9 ± 10.3ǂ 30.0 18.0 ± 16.8 25.0 0.003K
Group exchange p 0.000w   0.000w   0.000w   
ROM
Preoperative 116.3 ± 12.0* 120.0 106.9 ± 11.2 110.0 113.2 ± 12.5* 115.0 0.002K
Postoperative 128.3 ± 19.3*ǂ 130.0 124.5 ± 11.8 130.0 117.4 ± 18.3 120.0 0.002K
Change 11.9 ± 17.7ǂ 12.5 17.6 ± 15.6ǂ 20.0 4.2 ± 16.0 5.0 0.001K
Group exchange p 0.000w   0.000w   0.026w   
  1. K Kruskal-Wallis (Mann-Whitney U test)/wWilcoxon test/X2chi-square test (Fischer test)
  2. *Difference with the obese group p < 0.05/ǂcompared with the morbid obese group p < 0.05