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Table 3 Performance-based and self- report measures of 21 subjects randomized to a postoperative exercise intervention or usual care following primary total hip arthroplasty 6 weeks postoperatively (Pre-intervention) and 4 and 12 months postoperatively (Post-intervention)

From: A randomized pilot study of a comprehensive postoperative exercise program compared with usual care following primary total hip arthroplasty in subjects less than 65 years of age: feasibility, selection of outcome measures and timing of assessment

  6-weeks postoperative 4-months postoperative 12-months postoperative  
Pre-intervention Post-intervention Post-intervention
  Intervention Control Intervention Control Intervention Control P-value for group effect*
(n = 11) (n = 10) (n = 11) (n = 10) (n = 11) (n = 10)
Performance-based measures        
Mean 6-minute walk test in meters (SD) 331.0 (6.4) 287.1 (84.8) 450.6 (61.4) 435.8 (99.2) 500.6 (99.6) 495.6 (75.6) 0.92
Gait measures**        
 Mean velocity (SD) 0.55 (0.17) 0.46 (0.13) 0.72 (0.09) 0.77 (0.19) 0.75 (0.11) 0.84 (0.14) 0.96
 Mean cadence (SD) 0.73 (0.15) 0.70 (0.10) 0.86 (0.08) 0.93 (0.11) 0.88 (0.08) 0.93 (0.08) 0.91
 Mean stride length (SD) 0.74 (0.10) 0.64 (0.13) 0.83 (0.07) 0.83 (0.15) 0.85(0.08) 0.90 (0.11) 0.80
 Mean stride width (SD) 1.2 (0.63) 1.3 (0.29) 1.1 (0.44) 1.1 (0.45) 1.2 (0.38) 1.2 (0.22) 0.90
Self-report measures        
WOMAC†        
 Mean pain score (SD) 77.3 (17.8) 80.6 (15.7) 86.4 (14.2) 82.2 (10.0) 91.7 (13.2) 87.0 (18.9) 0.65
 Mean function score (SD) 71.8 (12.8) 70.4 (17.6) 82.4 (13.5) 81.2 (1.7) 90.8 (12.7) 85.6 (15.6) 0.98
RAND-36†        
 Mean physical function Score (SD) 42.7 (19.8) 33.5 (18.7) 67.1 (17.1) 64.4 (18.6) 82.8 (10.3) 73.3 (19.6) 0.48
 Mean physical role score (SD) 15.9 (35.8) 13.9 (33.3) 63.6 (45.2) 66.7 (50.0) 22.9 (25.3) 75.0 (40.8) 0.78
 Mean bodily pain score (SD) 49.5 (9.5) 41.0 (27.0) 71.5 (24.3) 56.8 (25.1) 82.3 (21.4) 73.4 (27.7) 0.31
 Mean general health score (SD) 73.9 (21.7) 69.9 (23.1) 75.5 (5.9) 78.8 (17.2) 83.4 (12.1) 69.9 (16.7) 0.70
 Mean vitality score (SD) 48.6 (15.2) 53.3 (18.9) 68.6 (19.5) 63.9 (19.3) 75.9 (15.5) 69.5 (24.3) 0.95
 Mean emotional role score (SD) 36.4 (45.8) 59.3 (49.4) 93.9 (20.1) 77.8 (37.3) 88.9 (33.3) 80.0 (35.8) 0.63
 Mean social function score (SD) 44.3 (25.2) 56.9 (36.5) 77.3 (23.6) 69.4 (27.3) 91.7 (16.5) 76.3 (24.6) 1.00
 Mean mental health score (SD) 70.5 (15.2) 80.4 (19.8) 86.5 (10.2) 84.9 (14.5) 84.0 (10.4) 80.7 (20.1) 0.38
  1. Legend: SD = Standard Deviation; WOMAC = Western Ontario McMaster Osteoarthritis Index; RAND-36 = RAND 36-Item Health Survey.
  2. *Analyzed using a 2-way Repeated Measures ANOVA.
  3. **Gait measures are listed as percentages relative to normal values. Values of less than 1 indicate that the study cohort was less than reference values; values greater than1 indicate that the study cohort was greater than normal values.
  4. †Scores are listed as 0 = no health limitations - 100 = maximal health limitations.