HOMEPRODUCTSCOMPANYCONTACTFAQResearchDictionaryPharmaSign Up FREE or Login

What are the radiographic reference values for acetabular under- and overcoverage?

AbstractBACKGROUND:
Both acetabular undercoverage (hip dysplasia) and overcoverage (pincer-type femoroacetabular impingement) can result in hip osteoarthritis. In contrast to undercoverage, there is a lack of information on radiographic reference values for excessive acetabular coverage.
QUESTIONS/PURPOSES:
(1) How do common radiographic hip parameters differ in hips with a deficient or an excessive acetabulum in relation to a control group; and (2) what are the reference values determined from these data for acetabular under- and overcoverage?
METHODS:
We retrospectively compared 11 radiographic parameters describing the radiographic acetabular anatomy among hip dysplasia (26 hips undergoing periacetabular osteotomy), control hips (21 hips, requiring no rim trimming during surgical hip dislocation), hips with overcoverage (14 hips, requiring rim trimming during surgical hip dislocation), and hips with severe overcoverage (25 hips, defined as having acetabular protrusio). The hips were selected from a patient cohort of a total of 593 hips. Radiographic parameters were assessed with computerized methods on anteroposterior pelvic radiographs and corrected for neutral pelvic orientation with the help of a true lateral radiograph.
RESULTS:
All parameters except the crossover sign differed among the four study groups. From dysplasia through control and overcoverage, the lateral center-edge angle, acetabular arc, and anteroposterior/craniocaudal coverage increased. In contrast, the medial center-edge angle, extrusion/acetabular index, Sharp angle, and prevalence of the posterior wall sign decreased. The following reference values were found: lateral center-edge angle 23° to 33°, medial center-edge angle 35° to 44°, acetabular arc 61° to 65°, extrusion index 17% to 27%, acetabular index 3° to 13°, Sharp angle 38° to 42°, negative crossover sign, positive posterior wall sign, anterior femoral head coverage 15% to 26%, posterior femoral head coverage 36% to 47%, and craniocaudal coverage 70% to 83%.
CONCLUSIONS:
These acetabular reference values define excessive and deficient coverage. They may be used for radiographic evaluation of symptomatic hips, may offer possible predictors for surgical outcomes, and serve to guide clinical decision-making.
AuthorsMoritz Tannast, Markus S Hanke, Guoyan Zheng, Simon D Steppacher, Klaus A Siebenrock
JournalClinical orthopaedics and related research (Clin Orthop Relat Res) Vol. 473 Issue 4 Pg. 1234-46 (Apr 2015) ISSN: 1528-1132 [Electronic] United States
PMID25384429 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
Topics
  • Acetabulum (anatomy & histology, diagnostic imaging)
  • Adolescent
  • Adult
  • Female
  • Femoracetabular Impingement (diagnostic imaging, pathology)
  • Hip Joint (diagnostic imaging)
  • Humans
  • Male
  • Osteoarthritis, Hip (pathology)
  • Radiography
  • Reference Values
  • Retrospective Studies
  • Young Adult

Join CureHunter, for free Research Interface BASIC access!

Take advantage of free CureHunter research engine access to explore the best drug and treatment options for any disease. Find out why thousands of doctors, pharma researchers and patient activists around the world use CureHunter every day.
Realize the full power of the drug-disease research graph!


Choose Username:
Email:
Password:
Verify Password:
Enter Code Shown: