Publication
Cam deformity and the omega angle, a novel quantitative measurement of femoral head-neck morphology: a 3D CT gender analysis in asymptomatic subjects
| dc.contributor.author | Mascarenhas, VV | |
| dc.contributor.author | Rego, P | |
| dc.contributor.author | Dantas, P | |
| dc.contributor.author | Gaspar, A | |
| dc.contributor.author | Soldado, F | |
| dc.contributor.author | Consciência, JG | |
| dc.date.accessioned | 2017-06-20T21:38:36Z | |
| dc.date.available | 2017-06-20T21:38:36Z | |
| dc.date.issued | 2017-05 | |
| dc.description.abstract | OBJECTIVE: Our objectives were to use 3D computed tomography (CT) to define head-neck morphologic gender-specific and normative parameters in asymptomatic individuals and use the omega angle (Ω°) to provide quantification data on the location and radial extension of a cam deformity. METHODS: We prospectively included 350 individuals and evaluated 188 asymptomatic hips that underwent semiautomated CT analysis. Different thresholds of alpha angle (α°) were considered in order to analyze cam morphology and determine Ω°. We calculated overall and gender-specific parameters for imaging signs of cam morphology (Ω° and circumferential α°). RESULTS: The 95 % reference interval limits were beyond abnormal thresholds found in the literature for cam morphology. Specifically, α° at 3/1 o´clock were 46.9°/60.8° overall, 51.8°/65.4° for men and 45.7°/55.3° for women. Cam prevalence, magnitude, location, and epicenter were significantly gender different. Increasing α° correlated with higher Ω°, meaning that higher angles correspond to larger cam deformities. CONCLUSION: Hip morphometry measurements in this cohort of asymptomatic individuals extended beyond current thresholds used for the clinical diagnosis of cam deformity, and α° was found to vary both by gender and measurement location. These results suggest that α° measurement is insufficient for the diagnosis of cam deformity. Enhanced morphometric evaluation, including 3D imaging and Ω°, may enable a more accurate diagnosis. KEY POINTS: • 95% reference interval limits of cam morphotype were beyond currently defined thresholds. • Current morphometric definitions for cam-type morphotype should be applied with care. • Cam prevalence, magnitude, location, and epicenter are significantly gender different. • Cam and alpha angle thresholds should be defined according to sex/location. • Quantitative 3D morphometric assessment allows thorough and reproducible FAI diagnosis and monitoring. | pt_PT |
| dc.description.version | info:eu-repo/semantics/publishedVersion | pt_PT |
| dc.identifier.citation | Eur Radiol. 2017 May;27(5):2011-2023. | pt_PT |
| dc.identifier.doi | 10.1007/s00330-016-4530-0 | pt_PT |
| dc.identifier.uri | http://hdl.handle.net/10400.26/18556 | |
| dc.language.iso | eng | pt_PT |
| dc.peerreviewed | yes | pt_PT |
| dc.subject | Tomografia Computadorizada | pt_PT |
| dc.subject | Cabeça do Femur | pt_PT |
| dc.subject | Impacto Femoroacetabular | pt_PT |
| dc.subject | Colo do Femur | pt_PT |
| dc.subject | Femúr | pt_PT |
| dc.subject | Femur Head | pt_PT |
| dc.subject | Tomography, X-Ray Computed | pt_PT |
| dc.subject | Femur Neck | pt_PT |
| dc.subject | Femoracetabular Impingement | pt_PT |
| dc.title | Cam deformity and the omega angle, a novel quantitative measurement of femoral head-neck morphology: a 3D CT gender analysis in asymptomatic subjects | pt_PT |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.endPage | 2023 | pt_PT |
| oaire.citation.issue | 5 | pt_PT |
| oaire.citation.startPage | 2011-2023 | pt_PT |
| oaire.citation.volume | 27 | pt_PT |
| rcaap.rights | openAccess | pt_PT |
| rcaap.type | article | pt_PT |