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A method of assessing the severity of cam type femoro-acetabular impingement in three dimensions

Femoroacetabular impingement is caused by abnormal morphology of either the femur or acetabulum or both. Diagnostic criteria currently include an alpha angle of over 50° on a lateral radiograph. In this study, CT scans of symptomatic hips (n = 37) were compared with normal hips (n = 34) obtained fro...

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Published in:	Hip international 2012-11, Vol.22 (6), p.677-682
Main Authors:	Masjedi, Milad, Azimi, David Y, Nightingale, Craig L, Harris, Simon J, Cobb, Justin P
Format:	Article
Language:	English
Subjects:	Female Femoracetabular Impingement - diagnostic imaging Humans Imaging, Three-Dimensional Male Severity of Illness Index Tomography, X-Ray Computed
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description	Femoroacetabular impingement is caused by abnormal morphology of either the femur or acetabulum or both. Diagnostic criteria currently include an alpha angle of over 50° on a lateral radiograph. In this study, CT scans of symptomatic hips (n = 37) were compared with normal hips (n = 34) obtained from CT colonoscopy procedures. The femoral head described in terms of a three dimensional (3D) alpha angle and a 3D head neck margin (epiphysis) angle '3Dμ' using a semi-automated algorithm. In normal hips 70% have a maximum 3Dα angle of more than 50° at some point around their femoral head (mean 53° ± 5°, range 42° - 64°), while in cam hips, it was significantly larger (mean 69° ± 10°, range 54° - 94°, p
doi_str_mv	10.5301/HIP.2012.9900
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Diagnostic criteria currently include an alpha angle of over 50° on a lateral radiograph. In this study, CT scans of symptomatic hips (n = 37) were compared with normal hips (n = 34) obtained from CT colonoscopy procedures. The femoral head described in terms of a three dimensional (3D) alpha angle and a 3D head neck margin (epiphysis) angle '3Dμ' using a semi-automated algorithm. In normal hips 70% have a maximum 3Dα angle of more than 50° at some point around their femoral head (mean 53° ± 5°, range 42° - 64°), while in cam hips, it was significantly larger (mean 69° ± 10°, range 54° - 94°, p<0.001). The 3Dμ also varied significantly and had a reverse relationship to that of the alpha angle: cam hips have an articular extent that crossed over spherical limit of the hip joint (mean minimum 41° ± 7°) while the articular margin of normal hips always remained within the spherical limit (mean minimum 49° ± 6°). This semi-automated algorithm provides an objective measure of the femoral head in health and disease. It can reliably distinguish cam hips from normal, enabling cam hips to have their cam quantified and their surgery planned objectively.</description><identifier>ISSN: 1120-7000</identifier><identifier>EISSN: 1724-6067</identifier><identifier>DOI: 10.5301/HIP.2012.9900</identifier><identifier>PMID: 23161227</identifier><language>eng</language><publisher>United States</publisher><subject>Female ; Femoracetabular Impingement - diagnostic imaging ; Humans ; Imaging, Three-Dimensional ; Male ; Severity of Illness Index ; Tomography, X-Ray Computed</subject><ispartof>Hip international, 2012-11, Vol.22 (6), p.677-682</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c293t-f6e4662250b491369da80b88aa133a3058787ee742fd19f784a5d972d106424e3</citedby><cites>FETCH-LOGICAL-c293t-f6e4662250b491369da80b88aa133a3058787ee742fd19f784a5d972d106424e3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/23161227$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Masjedi, Milad</creatorcontrib><creatorcontrib>Azimi, David Y</creatorcontrib><creatorcontrib>Nightingale, Craig L</creatorcontrib><creatorcontrib>Harris, Simon J</creatorcontrib><creatorcontrib>Cobb, Justin P</creatorcontrib><title>A method of assessing the severity of cam type femoro-acetabular impingement in three dimensions</title><title>Hip international</title><addtitle>Hip Int</addtitle><description>Femoroacetabular impingement is caused by abnormal morphology of either the femur or acetabulum or both. 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This semi-automated algorithm provides an objective measure of the femoral head in health and disease. It can reliably distinguish cam hips from normal, enabling cam hips to have their cam quantified and their surgery planned objectively.</description><subject>Female</subject><subject>Femoracetabular Impingement - diagnostic imaging</subject><subject>Humans</subject><subject>Imaging, Three-Dimensional</subject><subject>Male</subject><subject>Severity of Illness Index</subject><subject>Tomography, X-Ray Computed</subject><issn>1120-7000</issn><issn>1724-6067</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNo9kD1PwzAQhi0EoqUwsiKPLCnnj8TxWFVAK1WCAebgJBcalMTBdpD670nUwnR3uud9h4eQWwbLWAB72GxflxwYX2oNcEbmTHEZJZCo83FnHCIFADNy5f0XAOc6lpdkxgVLGOdqTj5WtMWwtyW1FTXeo_d190nDHqnHH3R1OEyfwrQ0HHqkFbbW2cgUGEw-NMbRuu3HBLbYBVp3Y9Ih0rIeb1_bzl-Ti8o0Hm9Oc0Henx7f1pto9_K8Xa92UcG1CFGVoEwSzmPIpWYi0aVJIU9TY5gQRkCcqlQhKsmrkulKpdLEpVa8ZJBILlEsyP2xt3f2e0Afsrb2BTaN6dAOPmNcCcliUGpEoyNaOOu9wyrrXd0ad8gYZJPUbJSaTVKzSerI352qh7zF8p_-syh-Ad_LcWw</recordid><startdate>201211</startdate><enddate>201211</enddate><creator>Masjedi, Milad</creator><creator>Azimi, David Y</creator><creator>Nightingale, Craig L</creator><creator>Harris, Simon J</creator><creator>Cobb, Justin P</creator><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>201211</creationdate><title>A method of assessing the severity of cam type femoro-acetabular impingement in three dimensions</title><author>Masjedi, Milad ; Azimi, David Y ; Nightingale, Craig L ; Harris, Simon J ; Cobb, Justin P</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c293t-f6e4662250b491369da80b88aa133a3058787ee742fd19f784a5d972d106424e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Female</topic><topic>Femoracetabular Impingement - diagnostic imaging</topic><topic>Humans</topic><topic>Imaging, Three-Dimensional</topic><topic>Male</topic><topic>Severity of Illness Index</topic><topic>Tomography, X-Ray Computed</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Masjedi, Milad</creatorcontrib><creatorcontrib>Azimi, David Y</creatorcontrib><creatorcontrib>Nightingale, Craig L</creatorcontrib><creatorcontrib>Harris, Simon J</creatorcontrib><creatorcontrib>Cobb, Justin P</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Hip international</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Masjedi, Milad</au><au>Azimi, David Y</au><au>Nightingale, Craig L</au><au>Harris, Simon J</au><au>Cobb, Justin P</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A method of assessing the severity of cam type femoro-acetabular impingement in three dimensions</atitle><jtitle>Hip international</jtitle><addtitle>Hip Int</addtitle><date>2012-11</date><risdate>2012</risdate><volume>22</volume><issue>6</issue><spage>677</spage><epage>682</epage><pages>677-682</pages><issn>1120-7000</issn><eissn>1724-6067</eissn><abstract>Femoroacetabular impingement is caused by abnormal morphology of either the femur or acetabulum or both. 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This semi-automated algorithm provides an objective measure of the femoral head in health and disease. It can reliably distinguish cam hips from normal, enabling cam hips to have their cam quantified and their surgery planned objectively.</abstract><cop>United States</cop><pmid>23161227</pmid><doi>10.5301/HIP.2012.9900</doi><tpages>6</tpages></addata></record>
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source	SAGE:Jisc Collections:SAGE Journals Read and Publish 2023-2024:2025 extension (reading list)
subjects	Female Femoracetabular Impingement - diagnostic imaging Humans Imaging, Three-Dimensional Male Severity of Illness Index Tomography, X-Ray Computed
title	A method of assessing the severity of cam type femoro-acetabular impingement in three dimensions
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