{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,2]],"date-time":"2026-07-02T05:07:33Z","timestamp":1782968853573,"version":"3.54.5"},"reference-count":31,"publisher":"SAGE Publications","issue":"2","license":[{"start":{"date-parts":[[2012,1,6]],"date-time":"2012-01-06T00:00:00Z","timestamp":1325808000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Sports Health: A Multidisciplinary Approach"],"published-print":{"date-parts":[[2012,3]]},"abstract":"<jats:p>Context: Patellofemoral pain syndrome (PFPS) is one of the most common overuse injuries.<\/jats:p>\n                  <jats:p>Objective: To assess the collective evidence of predisposing factors to PFPS.<\/jats:p>\n                  <jats:p>Data Sources: MEDLINE (1960\u2013June 2010), EMBASE (1980\u2013June 2010), and CINAHL (1982\u2013June 2010).<\/jats:p>\n                  <jats:p>Study Selection: Studies were included if patients were asymptomatic at baseline testing (free of PFPS) and were prospectively followed for the development of the disorder. Only studies that assessed at least 1 variable that can be measured at a typical clinic were included. After duplicates were removed, 973 studies were assessed from their titles or abstracts, 20 from the full text, and from these, 7 met the inclusion criteria.<\/jats:p>\n                  <jats:p>Data Extraction: Data were extracted for age, weight, height, sample size, patient type (military vs civilian), follow-up periods, diagnostic methods, and diagnostic criteria. Means and standard deviations were extracted for all outcome variables.<\/jats:p>\n                  <jats:p>Results: Meta-analyses were performed for height, weight, leanness, Q angle, number of sit-ups, knee extension strength, and peak knee valgus angle during landing. Lower knee extension strength was the only variable that was predictive of PFPS ( P &lt; 0.01). Other variables that were identified as predictive of PFPS by single studies were vertical jump, push-ups, knee flexion and hip abduction strength, thumb-to-forearm flexibility, quadriceps and gastrocnemius flexibility, genu varum, navicular drop, knee valgus moment at initial contact during landing, social support, and palliative reaction.<\/jats:p>\n                  <jats:p>Conclusions: It appears that anthropometric variables are not associated with PFPS, while knee extension strength deficits appear to be predictors of PFPS.<\/jats:p>","DOI":"10.1177\/1941738111432097","type":"journal-article","created":{"date-parts":[[2012,1,7]],"date-time":"2012-01-07T01:50:55Z","timestamp":1325901055000},"page":"115-120","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":66,"title":["Prospective Predictors of Patellofemoral Pain Syndrome"],"prefix":"10.1177","volume":"4","author":[{"given":"Evangelos","family":"Pappas","sequence":"first","affiliation":[{"name":"Long Island University\u2013Brooklyn Campus, Brooklyn, New York"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wing M.","family":"Wong-Tom","sequence":"additional","affiliation":[{"name":"ProMobility Physical Therapy, PC, New York, New 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