Reliability and validity of center-of-pressure quantification.

The purpose of this study was to determine the reliability and validity of two center-of-pressure quantification methods. One hundred five individuals (33 men and 72 women) with a mean age of 26.7 years participated in phase 1 of the study. Two measures of the center-of-pressure pattern, the lateral-medial area index and the lateral-medial force index, were calculated from plantar pressure data collected on all subjects. Between-trial reliability of the two measurements was assessed using intraclass correlation coefficients. In phase 2, frontal plane motion of the rearfoot was recorded in 30 individuals. Pearson correlation coefficients were then calculated between the two center-of-pressure indices and the magnitude of rearfoot eversion obtained from each subject during walking. Intraclass correlation coefficient values ranged from 0.374 to 0.889 for the lateral-medial area index and from 0.215 to 0.905 for the lateral-medial force index. Pearson correlation coefficients between the two center-of-pressure indices and the rearfoot kinematic variables ranged from 0.050 to 0.165. The lateral-medial area index and the lateral-medial force index may have adequate between-trial reliability but are not related to the magnitude of frontal plane rearfoot eversion during the stance phase of walking.

[1]  Effects of foot orthoses on center-of-pressure patterns in women. , 1989, Physical therapy.

[2]  J. R. Landis,et al.  The measurement of observer agreement for categorical data. , 1977, Biometrics.

[3]  J F Lehmann,et al.  Ankle-foot orthoses: effect on gait abnormalities in tibial nerve paralysis. , 1985, Archives of physical medicine and rehabilitation.

[4]  J. Nunley,et al.  Effects of ankle taping on the motion and loading pattern of the foot for walking subjects , 1988, Journal of orthopaedic research : official publication of the Orthopaedic Research Society.

[5]  M T Balmaseda,et al.  Ground reaction forces, center of pressure, and duration of stance with and without an ankle-foot orthosis. , 1988, Archives of physical medicine and rehabilitation.

[6]  T G McPoil,et al.  Three-dimensional movement of the foot during the stance phase of walking. , 1999, Journal of the American Podiatric Medical Association.

[7]  D E Krebs.  Declare your ICC type. , 1986, Physical therapy.

[8]  Scherer Pr,et al.  The center of pressure index in the evaluation of foot orthoses in shoes. , 1994, Clinics in podiatric medicine and surgery.

[9]  T G McPoil,et al.  A Comparison of Two Motion Analysis Systems for the Measurement of Two-Dimensional Rearfoot Motion During Walking , 1997, Foot & ankle international.