25310567
BACKGROUND	Clinicians require portable , valid , and cost-effective methods to monitor knee joint-position-sense ( JPS ) ability .
OBJECTIVE	To examine the criterion-related validity of image-capture JPS measures against an isokinetic-dynamometer ( IKD ) procedure .
METHODS	Random crossover design providing a comparison of knee JPS measures from image capture and IKD procedures .
METHODS	10 healthy participants , 5 female , age 28.0 13.29 y , mass 60.3 9.02 kg , height 1.65 0.07 m , and 5 male , 29.6 10.74 y , mass 73.6 5.86 kg , height 1.75 0.07 m.
METHODS	The dependent variables were absolute error scores ( AES ) provided by 2 knee directions ( flexion and extension ) .
METHODS	The independent variables were the method ( image capture and IKD ) .
RESULTS	There was no significant difference between clinical and IKD AES into knee-flexion data ( P = .263 , r = 0.55 ) .
RESULTS	There was a significant difference between clinical and IKD AES into knee-extension data ( P = .016 , r = .70 ) .
CONCLUSIONS	Analysis of photographic images to assess JPS measurements using knee flexion is valid against an IKD positioning method , but JPS measurements using knee extension may not be valid against IKD techniques .
CONCLUSIONS	However , photo-analysis measurements provided a lower error score using knee-extension data and thus may provide an optimal environment to produce maximal knee JPS acuity .
CONCLUSIONS	Therefore , clinicians do not need expensive equipment to collect representative JPS ability .

