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Magnetic Resonance Arthrographic Findings After Hip Labrum Resection Versus Refixation

Alexander Aichmair, Reto Sutter, Tobias Dietrich, Claudio Dora & Patrick O Zingg

abstract The aim of this study was to evaluate whether new tissue formation occurs after labral debridement/excision, and, if so, which morphological features are typical for a neo-labrum. The authors further compared the findings after labrum resection with those seen after labrum refixation. Patients with femoroacetabular impingement who underwent hip arthroscopy or surgical hip dislocation to address a labrum pathology were retrospectively included, and postoperative magnetic resonance arthrography studies were assessed. Forty-two patients had undergone either labrum resection (n=25) or refixation (n=17), performed arthroscopically (47.6%) or via surgical hip dislocation (52.4%). In the subgroup of patients after debridement/resection, there was anterosuperior/superior scar tissue in 83.5%, with amorphous configuration in 92%, irregular surface in approximately two-thirds of the cases, and a mean±SD thickness of 7.0±2.7 mm. A labrum-like shape of the scar plate was seen in 7.7%. Regarding the subgroup of patients who had undergone labral refixation, an irregular or rounded labrum shape was noted in 26.5% and 51.3% of cases, respectively, with a triangular shape in less than one-fourth of cases. Labrum re-tears (35.7%) were mainly observed at the base (71.7%), rather than within the labral substance (28.4%). New tissue formation can be observed in the majority of cases after excision of the hip labrum, with amorphous and irregular surface configuration compared with a native labrum. This new tissue should therefore be referred to as scar tissue rather than as neo-labrum. Whether scar tissue is inferior to a refixed labrum needs to be further elucidated in follow-up studies. [. 2021;44(4):e607-e613.].
   
citation Aichmair A, Sutter R, Dietrich T, Dora C, Zingg P O. Magnetic Resonance Arthrographic Findings After Hip Labrum Resection Versus Refixation. Orthopedics 2021; 44:e607-e613.
   
type journal paper/review (English)
date of publishing 01-07-2021
journal title Orthopedics (44/4)
ISSN electronic 1938-2367
pages e607-e613
PubMed 34292826
DOI 10.3928/01477447-20210618-25