Purpose
The purpose of this study was to evaluate the clinical, radiographic, histologic,
and intraoperative findings of an amorphous calcification involving the acetabular
labrum.
Methods
From October 2008 to April 2013, all patients who underwent arthroscopic hip surgery
for symptomatic intra-articular hip disorders and were found to have the characteristic
calcific deposit involving the acetabular labrum were included. These patients were
reviewed retrospectively on prospectively collected data. Radiographs were retrospectively
evaluated for morphologic features of impingement and characteristics of labral calcification.
Results
Sixteen patients were identified as having amorphous calcification at the time of
arthroscopy. There were 15 women and 1 man. Mean age was 37.3 years (range, 30 to
50 years). Symptoms were present for a mean of 9.3 months (range, 3 to 48 months).
All patients reported anterior groin pain. Fifteen (94%) patients had positive anterior
impingement and 9 (56%) had positive results for lateral impingement. Calcifications
measured on average 3.2 mm (range, 1.9 mm to 5.6 mm), and 14 had a clear separation
from the rim with increased opacity compared with neighboring trabecular bone. Intraoperatively,
the characteristic amorphous calcium deposit was located in the anterosuperior labrum,
with the deposit found to be accessible from the capsule-labral recess in all cases.
All patients had labral tears and all patients had at least one component of femoroacetabular
impingement (FAI).
Conclusions
Calcification in the anterosuperior acetabular labrum presents with a consistent patient
demographic and distinct radiographic and arthroscopic presentation that is different
from os acetabuli. As with os acetabuli, one should have a high suspicion for FAI
when this lesion is encountered.
Level of Evidence
Level IV, therapeutic case series.
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Article info
Publication history
Accepted:
December 31,
2013
Received:
May 22,
2013
Footnotes
The authors report the following potential conflict of interest or source of funding: B.G.D. receives support from MAKO Surgical Corp, Arthrex, and the American Hip Institute. Y.F.E.B., T.J.J., D.L., C.E.S., and J.C.S. receive support from the American Hip Institute.
Identification
Copyright
© 2014 Arthroscopy Association of North America. Published by Elsevier Inc. All rights reserved.
