title: Validity and comparisons of tibiofemoral orientations and displacement using a femoral tracking device during early to mid stance of walking.
abstract: First, this study compares tibiofemoral motion during walking using a new femoral tracking device (FTD) and bone mounted markers in a single subject (n=1). The results suggest errors of <3 degrees in tibiofemoral angles using the FTD method over the first 85% of stance. Second, this study compares tibiofemoral angles and displacement during walking using the FTD method and a modified Helen Hayes method to track the femur in 13 subjects (n=13). The results suggest similar tibiofemoral angles in the sagittal and frontal planes using the two methods (average root mean square (RMS) differences <3.6+/-1.5 degrees ), and a large decrease in the transverse plane angles (average RMS differences=6.5+/-1.9 degrees ) and estimates of tibiofemoral displacement (P<0.05) using the FTD method. The FTD method presents a practical alternative to recording tibiofemoral transverse plane angles and displacement over the first 85% of stance.
authors.affiliation: Ithaca College, School of Health Sciences and Human Performance, Department of Physical Therapy, 300 East River Road, Suite 1-101, Rochester, NY 14623, USA. jhouck@ithaca.edu
authors.forename: Jeff
authors.initials: J
authors.lastname: Houck
authors.forename: H John
authors.initials: HJ
authors.lastname: Yack
authors.forename: Tyler
authors.initials: T
authors.lastname: Cuddeford
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D001858:Bone Nails; D005260:Female; D005684:Gait / Q000502:physiology*; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D026741:Physical Therapy Modalities / Q000295:instrumentation / Q000379:methods*; D015203:Reproducibility of Results