Table 3

Inter-rater reproducibility of hip range of motion (deg.) and muscle strength (N) for 2 orthopaedists and 2 chiropractors
Hip range of motion measured with a goniometer to the nearest 5 deg. Ortho 1 (deg.) Mean (SD) Ortho 2 (deg.) Mean (SD) Mean difference (SD) Percent agreement (%)* LOA (deg.) SEM† ICC (95% CI)
Flexion (n = 48) 113 (18) 106 (14) 7 (10)‡ 71 -12 – 26 8 0.73 (0.38 – 0.87)
Extension (n = 48) 6 (6) 4 (8) 2 (5)‡ 79 -8 – 13 4 0.68 (0.46 – 0.81)
Abduction (n = 48) 29 (10) 26 (8) 3 (7)‡ 67 -12 – 17 6 0.63 (0.41 – 0.76)
Adduction (n = 48) 17 (7) 17 (7) 0 (6) 77 -11 – 12 4 0.65 (0.45 – 0.79)
Internal rotation (n = 48) 4 (14) 12 (14) -8 (10)‡ 42 -28 – 12 9 0.63 (0.17 – 0.82)
External rotation (n = 48) 28 (11) 33 (7) -4 (9)‡ 69 -21 – 13 6 0.53 (0.26 – 0.72)
Hip muscle strength measured with a dynamometer in Newton (N) Strength (N) Strength (N) (N)
Abduction (n = 48) 213 (65) 212 (67) 0 (37) -72 – 72 26 0.85 (0.74 – 0.91)
Flexion (n = 48) 167 (42) 185 (50) -21 (41)‡ -101 – 59 32 0.55 (0.28 – 0.73)
Internal rotation (n = 48) 151 (38) 146 (36) 5 (36) -66 – 76 26 0.52 (0.29 – 0.70)
External rotation (n = 48) 123 (34) 132 (39) -9 (28)‡ -65 – 47 21 0.68 (0.49 – 0.81)
Hip range of motion measured with a goniometer to the nearest 5 deg. Chiro 1 (deg.) Mean (SD)

Chiro 2 (deg.)

Mean (SD)

Mean difference (SD) Percent agreement (%)* LOA (deg.) SEM† ICC (95% CI)
Flexion (n = 61) 112 (13) 108 (15) 4 (9)‡ 83 -14 – 21 7 0.79 (0.63 – 0.88)
Extension (n = 61) 9 (5) 14 (5) -6 (5)‡ 66 -16 – 5 5 0.33 (0.06 – 0.61)
Abduction (n = 61) 29 (9) 22 (9) 7 (8)‡ 46 -8 – 23 8 0.45 (0.01 – 0.71)
Adduction (n = 61) 17 (7) 14 (5) 3 (8)‡ 61 -13 – 19 6 0.14 (0.09 – 0.36)
Internal rotation (n = 61) 13 (10) 11 (16) 2 (14) 31 -25 – 30 10 0.44 (0.21 – 0.62)
External rotation (n = 61) 32 (9) 30 (12) 2 (11) 59 -19 – 23 8 0.48 (0.27 – 0.65)
Hip muscle strength measured with a dynamometer in Newton (N) Strength (N) Strength (N) (N)
Abduction (n = 61) 141 (42) 186 (61) -45 (51)‡ -146 – 55 48 0.38 (0.00 – 0.64)
Flexion (n = 61) 165 (50) 178 (65) -11 (35)‡ -79 – 56 26 0.81 (0.69 – 0.88)
Internal rotation (n = 61) 142 (43) 190 (49) -48 (34)‡ -115 – 19 42 0.48 (0.09 – 0.77)
External rotation (n = 61) 120 (34) 150 (48) -30 (26)‡ -80 – 20 28 0.65 (0.00 – 0.82)

deg., degrees; N, newton; SD, standard deviation; LOA, limits of agreement; SEM, standard error of the measurement; ICC, intraclass correlation coeffficient; CI, confidence interval.

*Percent agreement. Difference ≤ 5o between examiners except for flexion ≤10o.

†SEMagreement.

‡Statistically significant differences between means, p<0.05.

Poulsen et al.

Poulsen et al. BMC Musculoskeletal Disorders 2012 13:242   doi:10.1186/1471-2474-13-242

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