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Table 2 Results of pre- and postoperative measurements and changes therein among control and LST groups

From: Effects of preoperative low-intensity training with slow movement on early quadriceps weakness after total knee arthroplasty in patients with knee osteoarthritis: a retrospective propensity score-matched study

Parameters Control (n = 41) LST (n = 41) Change
Pre Post Change Pre Post Change p ES
Knee circumference (1 cm) (cm) 39 (37, 41) 43 (40, 45) 10 (8, 12) 40 (37, 41) 43 (41, 44) 9 (7, 10) 0.00 0.65
Knee circumference (10 cm) (cm) 44 (41, 47) 47 (44, 50) 9 (4, 10) 44 (41, 46) 46 (44, 48) 6 (3, 8) 0.01 0.57
Thigh volume (× 102 cm3) 13 (11, 14) 15 (13, 16) 21 (13, 23) 12 (11, 13) 14 (13, 15) 13 (12, 18) 0.00 0.67
Knee pain during the QST (mm) 10 (0, 29) 68 (30, 80) 40 (20, 68) 7 (0, 27) 62 (41, 76) 44 (17, 65) 0.72 0.08
Knee pain during the TUG (mm) 20 (8, 40) 30 (27, 60) 20 (−10, 39) 18 (5, 43) 53 (43, 70) 32 (2, 48) 0.16 0.32
Quadriceps strength (Nm/kg) 1.2 (1.0, 1.5) 0.4 (0.3, 0.5) − 69 (−79, −59) 1.3 (1.1, 1.4) 0.5 (0.4, 0,7) −57 (−63, −46) 0.00 0.84
TUG (s) 7 (7, 8) 18 (14, 22) 137 (86, 191) 7 (6, 8) 14 (12, 18) 97 (68, 132) 0.00 0.68
  1. Note. Results of pre- and postoperative measurements and changes therein are presented as median (IQR). p values are those for independent samples t-test or Mann-Whitney U test. ES indicates the effect size (Cohen’s d) quantifying difference in measurement changes between both groups
  2. Abbreviation: LST low-intensity resistance exercise with slow movement and tonic force generation, ES effect size, TUG timed up and go test