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Table 2 Pressure platform measurements at the heel at 20%, 35% and 92% of the stance phase for boys with Sever’s disease and controls

From: Slow velocity of the center of pressure and high heel pressures may increase the risk of Sever’s disease: a case-control study

Variable Total (N = 106) Mean ± SD (95% CI) Sever’s disease (n = 53) Mean ± SD (95% CI) Control group (n = 53) Mean ± SD (95% CI) P value Cohen’s d
Average peak pressure at the heel at 20% of the stance phase (g/cm2) 3985.15 ± 3493.28 (3320.14–4650.16) 7273.26 ± 1610.49 (6839.68–7706.84) 697.05 ± 89.03 (673.08–721.02) < 0.001 4.083
Maximum peak pressure at the heel at 20% of the stance phase (g/cm2) 4620 ± 3902.92 (3877.40–5363.39) 8451.09 ± 914.81 (8204.81–8607.38) 789.70 ± 93.80 (764.44–814.95) < 0.001 8.374
Velocity of the COP at the heel at 20% of the stance phase (mm/s) 42.17 ± 15.42 (39.24–45.11) 27.74 ± 3.94 (26.68–28.80) 56.61 ± 6.31 (54.91–58.31) < 0.001 4.575
Plantar surface contact area at the heel at 20% of the stance phase (cm2) 30.08 ± 3.59 (29.40–30.76) 30.11 ± 3.52 (29.16–31.06) 30.05 ± 3.70 (29.05–31.05) 0.935 0.017
Average peak pressure at the heel at 35% of the stance phase (g/cm2) 3550.67 ± 3141.50 (2952.63–4148.72) 6404.82 ± 1818.88 (5915.14–6894.50) 696.52 ± 117.92 (664.78–728.27) 0.001 3.138
Maximum peak pressure at the heel at 35% of the stance phase (g/cm2) 4448.57 ± 3716.58 (3741.05–5156.10) 7990.23 ± 1520.87 (7580.78–8399.68) 906.92 ± 97.58 (880.65–933.19) 0.001 4.657
Velocity at the heel at 35% of the stance phase (mm/s) 50.34 ± 16.92 (47.12–53.56) 35.51 ± 5.87 (33.93–37.09) 65.17 ± 9.77 (62.54–67.80) 0.001 3.035
Surface at the heel at 35% of the stance phase (cm2) 52.27 ± 6.02 (51.12–53.41) 51.30 ± 4.33 (50.13–52.46) 53.24 ± 7.24 (51.29–55.19) 0.090 0.267
Average peak pressure at the forefoot at 92% of the stance phase (g/cm2) 982.97 ± 312.21 (923.53–1042.41) 1200.14 ± 303.29 (1118.49–1281.80) 765.80 ± 93.28 (740.68–790.91) 0.001 1.432
Maximum peak pressure at the forefoot at 92% of the stance phase (g/cm2) 1248.85 ± 436.62 (1165.73–1331.97) 1560.41 ± 422.90 (1446.56–1674.27) 937.29 ± 90.71 (912.87–961.71) 0.001 1.473
Velocity of the COP at the forefoot at 92% of the stance phase (mm/s) 33.31 ± 5.44 (32.27–34.35) 34.59 ± 5.31 (33.16–36.02) 32.03 ± 5.32 (30.59–33.46) 0.014 0.481
Surface at the forefoot at 92% of the stance phase (cm2) 43.19 ± 4.81 (42.28–44.11) 42.96 ± 1.11 (41.85–44.07) 43.43 ± 5.44 (41.96–44.89) 0.616 0.086