{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,20]],"date-time":"2025-10-20T00:38:17Z","timestamp":1760920697011,"version":"build-2065373602"},"reference-count":43,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2021,9,12]],"date-time":"2021-09-12T00:00:00Z","timestamp":1631404800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2021,9,12]],"date-time":"2021-09-12T00:00:00Z","timestamp":1631404800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2021,9,12]],"date-time":"2021-09-12T00:00:00Z","timestamp":1631404800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100006075","name":"Greta och Johan Kocks stiftelser","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100006075","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003252","name":"Lunds Universitet","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100003252","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100006075","name":"Greta och Johan Kocks stiftelser","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100006075","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003252","name":"Lund University","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100003252","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Knee surg. sports traumatol. arthrosc."],"published-print":{"date-parts":[[2021,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>A higher alpha angle has been proposed to correlate with lower hip range of motion, but the association in people with longstanding hip and groin pain is currently unclear. The aims were to: (1) assess the association between range of motion and alpha angle in patients with longstanding hip and groin pain; (2) examine if a cut\u2010off value in range of motion variables could identify patients with an alpha angle above or below 60\u00b0.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Seventy\u2010two participants were consecutively recruited from an orthopaedic department after referral for hip\u2010 and groin\u2010related pain. Passive hip range of motion was measured in flexion, internal rotation with 90\u00b0 hip flexion, internal rotation in neutral hip position, external rotation with 90\u00b0 hip flexion, and abduction. The alpha angle was calculated from a frog\u2010leg lateral radiograph. Linear regression examined the association between range of motion and alpha angle, and an ROC\u2010curve analysis was performed to identify the sensitivity and specificity of range of motion cut\u2010offs.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Lower range of motion in internal rotation in flexion, external rotation, and abduction were associated with higher alpha angle. Internal rotation of 27\u00b0 or less displayed good sensitivity (81%) and specificity (85%) to detect an alpha angle above 60\u00b0, while a cut\u2010off of 41\u00b0 in external rotation and 27\u00b0 in abduction showed a sensitivity of 72% and specificity of 50% and 60%, respectively.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Less internal rotation in flexion, external rotation, and abduction are associated with a greater alpha angle in a cohort of people with longstanding hip and groin pain. A cut\u2010off of 27\u00b0 in internal rotation has good sensitivity and specificity to identify people with an alpha angle above or below 60\u00b0 and have the potential to be used in the clinical setting to identify patients that require further imaging, or that are unlikely to have cam morphology.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of evidence<\/jats:title><jats:p>II.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-021-06733-2","type":"journal-article","created":{"date-parts":[[2021,9,12]],"date-time":"2021-09-12T10:04:01Z","timestamp":1631441041000},"page":"4091-4099","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Less hip range of motion is associated with a greater alpha angle in people with longstanding hip and groin 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