{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,28]],"date-time":"2026-01-28T08:38:01Z","timestamp":1769589481699,"version":"3.49.0"},"reference-count":0,"publisher":"Human Kinetics","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2015,11]]},"abstract":"<jats:sec sec-type=\"context\"><jats:title>Context:<\/jats:title><jats:p>Hip- and knee-joint kinematics during drop landings are relevant to lower-extremity injury mechanisms. In clinical research the \u201cgold standard\u201d for joint kinematic assessment is 3-dimensional (3D) motion analysis. However, 2-dimensional (2D) kinematic analysis is an objective and feasible alternative.<\/jats:p><\/jats:sec><jats:sec sec-type=\"objective\"><jats:title>Objective:<\/jats:title><jats:p>To quantify the relationship between 2D and 3D hip and knee kinematics in single-leg drop landings and test for a set of 3D hip and knee kinematics that best predicts 2D kinematic measures during single-leg drop landings Design: Descriptive, comparative laboratory study.<\/jats:p><\/jats:sec><jats:sec sec-type=\"participants\"><jats:title>Participants:<\/jats:title><jats:p>31 healthy college-age women (65.5 kg [SD 12.3], 168.1 cm [SD 6.7]).<\/jats:p><\/jats:sec><jats:sec sec-type=\"methods\"><jats:title>Methods:<\/jats:title><jats:p>Participants performed five 40-cm single-leg landings during motion capture at 240 Hz. Multiple regressions were used to predict relationships for knee and hip between 2D frontal-plane projection angles (FPPA) and 3D measurements.<\/jats:p><\/jats:sec><jats:sec sec-type=\"results\"><jats:title>Results:<\/jats:title><jats:p>2D knee FPPA had a strong relationship with 3D frontal-plane knee kinematics at initial contact (IC) (<jats:italic>r<\/jats:italic><jats:sup>2<\/jats:sup> = .72), which was only minimally improved with the addition of knee sagittal-plane and hip transverse-plane positions at IC (<jats:italic>r<\/jats:italic><jats:sup>2<\/jats:sup> = .77). In contrast, 2D knee FPPA had a low relationship with 3D knee-abduction excursion (<jats:italic>r<\/jats:italic><jats:sup>2<\/jats:sup> = .06). The addition of knee sagittal-plane and hip transverse-plane motions did not improve this relationship (<jats:italic>r<\/jats:italic><jats:sup>2<\/jats:sup> = .14). 2D hip FPPA had a moderate relationship with 3D frontal-plane hip position at IC (<jats:italic>r<\/jats:italic><jats:sup>2<\/jats:sup> = .52), which was strengthened with the addition of hip sagittal-plane position (<jats:italic>r<\/jats:italic><jats:sup>2<\/jats:sup> = .60). In addition, hip 2D FPPA into adduction excursion had a strong association with 3D hip-adduction excursion (<jats:italic>r<\/jats:italic><jats:sup>2<\/jats:sup> = .70).<\/jats:p><\/jats:sec><jats:sec sec-type=\"conclusion\"><jats:title>Conclusion:<\/jats:title><jats:p>2D kinematics can predict 3D frontal-plane hip and knee position at IC during a single-leg landing but predict 3D frontal-plane knee excursion with far less accuracy.<\/jats:p><\/jats:sec>","DOI":"10.1123\/jsr.2014-0206","type":"journal-article","created":{"date-parts":[[2015,2,6]],"date-time":"2015-02-06T14:10:03Z","timestamp":1423231803000},"page":"363-372","source":"Crossref","is-referenced-by-count":24,"title":["Two- and Three-Dimensional Relationships Between Knee and Hip Kinematic Motion Analysis: Single-Leg Drop-Jump Landings"],"prefix":"10.1123","volume":"24","author":[{"given":"Bryan","family":"Sorenson","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thomas W.","family":"Kernozek","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John David","family":"Willson","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robert","family":"Ragan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jordan","family":"Hove","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"100","container-title":["Journal of Sport Rehabilitation"],"original-title":[],"link":[{"URL":"https:\/\/journals.humankinetics.com\/view\/journals\/jsr\/24\/4\/article-p363.xml","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.humankinetics.com\/downloadpdf\/journals\/jsr\/24\/4\/article-p363.xml","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,5,19]],"date-time":"2022-05-19T23:08:25Z","timestamp":1653001705000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.humankinetics.com\/view\/journals\/jsr\/24\/4\/article-p363.xml"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2015,11]]},"references-count":0,"journal-issue":{"issue":"4"},"URL":"https:\/\/doi.org\/10.1123\/jsr.2014-0206","relation":{},"ISSN":["1056-6716","1543-3072"],"issn-type":[{"value":"1056-6716","type":"print"},{"value":"1543-3072","type":"electronic"}],"subject":[],"published":{"date-parts":[[2015,11]]}}}