{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,28]],"date-time":"2025-08-28T00:11:59Z","timestamp":1756339919274,"version":"3.44.0"},"reference-count":20,"publisher":"Human Kinetics","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2022,8,1]]},"abstract":"<jats:p><jats:italic><jats:bold>Context:<\/jats:bold><\/jats:italic> Abnormal knee frontal plane projection angles (FPPA) during movement have been associated with patellofemoral pain. As such, clinicians are interested in valid and reliable instruments suitable for broad-based clinical use that allow them to objectively measure such variables. Therefore, the purpose of the current study was to examine the criterion validity and reliability of knee FPPA measures obtained by clinicians using a free tablet application called Technique. <jats:italic><jats:bold>Design:<\/jats:bold><\/jats:italic> Validity\/reliability study. <jats:italic><jats:bold>Methods:<\/jats:bold><\/jats:italic> To examine validity, the same raters measured 10, two-dimensional criterion reference angles at the first testing session. To examine reliability, the knee FPPA of 16 subjects was measured by 6 raters (3 physical therapists and 3 student physical therapists) on 2 separate occasions while performing a single-limb step-down task. Validity was investigated by calculating the 95% limits of agreement, mean absolute differences, and Bland\u2013Altman plots. Reliability was examined by calculating intraclass correlation coefficients and the SE of measure. <jats:italic><jats:bold>Results:<\/jats:bold><\/jats:italic> For validity, the mean absolute difference between rater and criterion reference angle measures ranged from 0.20\u00b0 to 0.90\u00b0. Ninety-five percent of expected errors between rater and criterion reference angle measures were 2.04\u00b0 or less. For reliability, the intraclass correlation coefficient values for interrater and intrarater reliability were excellent ranging from .994 to .998 with SE of measure ranging from 0.44\u00b0 to 0.84\u00b0. <jats:italic><jats:bold>Conclusions:<\/jats:bold><\/jats:italic> These findings indicate that knee FPPA measures obtained during a single-limb step-down task using the Technique tablet application are valid and reliable, and suitable for clinical use.<\/jats:p>","DOI":"10.1123\/jsr.2021-0356","type":"journal-article","created":{"date-parts":[[2022,3,31]],"date-time":"2022-03-31T03:09:41Z","timestamp":1648696181000},"page":"797-802","source":"Crossref","is-referenced-by-count":0,"title":["Criterion Validity and Reliability of Knee Frontal Plane Projection Angles Measured Using the Technique Application"],"prefix":"10.1123","volume":"31","author":[{"given":"Lee T.","family":"Atkins","sequence":"first","affiliation":[{"name":"Department of Physical Therapy, University of North Texas Health Science Center, Fort Worth, TX, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tyler","family":"Van Bastian","sequence":"additional","affiliation":[{"name":"New Mexico Orthopaedics, Rio Rancho, NM, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sterling D.","family":"Eckert","sequence":"additional","affiliation":[{"name":"Fyzical Therapy and Balance Center, San Angelo, TX, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Timothy R.","family":"Hofmann","sequence":"additional","affiliation":[{"name":"Advanced Clinical Associates, Scottsdale, AZ, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Emily L.","family":"Pierce","sequence":"additional","affiliation":[{"name":"Athletico, Rockwall, TX, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jim","family":"Richards","sequence":"additional","affiliation":[{"name":"Allied Health Research Unit, University of Central Lancashire, Preston, Lancashire, United Kingdom"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"James","family":"Selfe","sequence":"additional","affiliation":[{"name":"Department of Health Professions, Manchester Metropolitan University, Manchester, United Kingdom"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael","family":"Callaghan","sequence":"additional","affiliation":[{"name":"Department of Health Professions, Manchester Metropolitan University, Manchester, United Kingdom"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"100","reference":[{"issue":"1","key":"r1","series-title":"PLoS One","article-title":"Incidence and prevalence of patellofemoral pain: a systematic review and meta-analysis","volume":"13","author":"Smith BE","year":"2018","unstructured":"Smith BE, Selfe J, Thacker D, et\u00a0al. 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