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. 2015 Feb 24;3(2):2325967115572573.
doi: 10.1177/2325967115572573. eCollection 2015 Feb.

Does Labral Size Correlate With Degree of Acetabular Dysplasia?

Asheesh Gupta  1 , Sivashankar Chandrasekaran  1 , John M Redmond  1 , Jon E Hammarstedt  1 , T Luke Cramer  1 , Yuan Liu  2 , Benjamin G Domb  3
Affiliations

Does Labral Size Correlate With Degree of Acetabular Dysplasia?

Asheesh Gupta et al. Orthop J Sports Med. .

Abstract

Background: Hip dysplasia has been shown to be a cause of early arthritis. The decrease in bony coverage has shown increased stress on the acetabular labrum as it shares an increased load.

Purpose/hypothesis: The purpose of this study was to divide a cohort of patients by radiographic measures of dysplastic and nondysplastic hips for comparison with regard to labral size at 4 anatomic locations. The hypothesis was that dysplastic hips will have significantly larger labral size compared with nondysplastic hips.

Study design: Cross-sectional study; Level of evidence, 3.

Methods: A prospective study was conducted at a single institution. A total of 130 patients underwent hip arthroscopy during the study period from September 2011 to February 2012. Intraoperatively, arthroscopic measurements were taken at 4 quadrants on the acetabular clockface: anterosuperior (12-3 o'clock), anteroinferior (3-6 o'clock), posterosuperior (9-12 o'clock), and posteroinferior (6-9 o'clock). Three radiographic parameters for dysplasia were used to substratify the study population base: lateral center-edge angle (LCEA) ≤25° and LCEA >25°, acetabular inclination (AI) ≤10° and AI >10°, and anterior center-edge angle (ACEA) ≤20° and ACEA >20°.

Results: For the LCEA ≤25° group, there were 28 hips with mean LCEA of 20.96° ± 3.40°. Patients with LCEA ≤25° had larger labral width in all 4 quadrants (P < .05). For AI >10°, there were 12 hips with the mean AI 12.92° ± 2.50°. Patients with AI >10° had larger labral size in the posteroinferior quadrant only (P < .05). For ACEA ≤20°, there were 4 hips with a mean ACEA of 11.25° ± 5.19°. The anteroinferior and posteroinferior quadrants had a significant increase in labral size when substratified by ACEA ≤20° (P < .05).

Conclusion: Labral size was significantly larger in dysplastic hips compared with nondysplastic hips. The posteroinferior quadrant labrum was larger in size in dysplastic hips, as measured by any of the 3 radiographic measurements of dysplasia. Hips with LCEA ≤25° had larger labra in all 4 quadrants.

Keywords: hip arthroscopy; hip dysplasia; hip imaging; hip labrum.

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Conflict of interest statement

One or more of the authors has reported the following potential conflict of interest or source of funding: B.G.D. receives financial support from Arthrex, Mako Surgical, Padra, DJO Global, ATI, Orthomerica, and Breg and has patents pending related to the arthroscopic labral reconstruction technique and kit. This study was funded by the American Hip Institute, which receives funding from Arthrex, Mako Surgical, Padra, ATI, and Breg.

Figures

Figure 1.
Figure 1.
Acetabulum with clockface. AInf, anteroinferior; ASup, anterosuperior; PInf, posteroinferior; PSup, posterosuperior.
Figure 2.
Figure 2.
Labral size at each quadrant based on lateral center-edge angle (LCEA). AInf, anteroinferior; ASup, anterosuperior; PInf, posteroinferior; PSup, posterosuperior.
Figure 3.
Figure 3.
Labral size at each quadrant based on acetabular inclination (AI). AInf, anteroinferior; ASup, anterosuperior; PInf, posteroinferior; PSup, posterosuperior.
Figure 4.
Figure 4.
Labral size at each quadrant based on anterior center-edge angle (ACEA). AInf, anteroinferior; ASup, anterosuperior; PInf, posteroinferior; PSup, posterosuperior.
See this image and copyright information in PMC

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