ArticleInternational orthopaedics2016
Morphologic and angular planning for cam resection in femoro-acetabular impingement: value of the omega angle.
Article in International orthopaedics, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed, 19 citations in OpenAlex.
- Trial
- Preoperative measurement of femoral head using 3D-CT spherical fitting technique for the guidance of femoroplasty in arthroscopic treatment of cam-type femoroacetabular impingement: a cohort validation.Frontiers in medicine · 2026Article
- Hip arthroscopy for lateral cam morphology: how important are the vessels?Journal of hip preservation surgery · 2020Review
- Arthroscopic versus open treatment of cam-type femoro-acetabular impingement: retrospective cohort clinical study.International orthopaedics · 2018Article
- Hip shape is symmetric, non-dependent on limb dominance and gender-specific: implications for femoroacetabular impingement. A 3D CT analysis in asymptomatic subjects.European radiology · 2018Article
- Cam deformity and the omega angle, a novel quantitative measurement of femoral head-neck morphology: a 3D CT gender analysis in asymptomatic subjects.European radiology · 2017Article
- Radiographic outcomes following femoroacetabular impingement correction with open surgical management: a systematic review.Current reviews in musculoskeletal medicine · 2016Review
- What the Papers Say.Journal of hip preservation surgery · 2016Article
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Authors and funding
7 authors at 4 institutions in 3 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeThe alpha angle is used to quantify in a single plane the head-neck junction deformity of cam femoro-acetabular impingement (FAI). When the deformity overlaps the superior retinaculum, femoral head osteoplasty in this area can jeopardise intra-articular vascular structures. This study proposes a new angular measure of the linear radial extension of cam deformity as a planning tool for bone resection and compares the accuracy of femoral head osteoplasty using open and arthroscopic surgery.
methodsTwenty-five symptomatic patients operated on for FAI were included in this study. Radial magnetic resonance imaging (MRI) was done before and after surgery. Bi-dimensional coordinates of the vascular foramina and radial extension of the deformity (omega angle) were measured. This extension was correlated with the vascular foramina location and alpha-angle value. Accuracy of resection and hip function were evaluated before and after surgery.
resultsThe cam lesion frequently extended posteriorly. No relation between values of alpha and omega angles was found. Cam resection was complete in 88 % of cases; there was a significant improvement in outcome score after surgery.
conclusionsThis study showed that alpha angle, measured in one plane, was not a predictor of the radial extension of cam deformity. To achieve a full resection, it was frequently necessary to extend the femoral head osteoplasty over the retinacular area. Pre-operative determination of the omega angle and location of the vascular foramina helped improve cam resection safety and accuracy.
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