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Erschienen in: Clinical Orthopaedics and Related Research® 4/2015

01.04.2015 | Symposium: 2014 Bernese Hip Symposium

No Regeneration of the Human Acetabular Labrum After Excision to Bone

verfasst von: Hermes H. Miozzari, MD, Marco Celia, MD, John M. Clark, MD, PhD, Stefan Werlen, MD, Florian D. Naal, MD, Hubert P. Nötzli, MD

Erschienen in: Clinical Orthopaedics and Related Research® | Ausgabe 4/2015

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Abstract

Background

Treatment options for a symptomatic, torn, irreparable, or completely ossified acetabular labrum are limited to either excision and/or reconstruction with grafts. In a previous animal model, regeneration of the acetabular labrum after excision to the bony rim has been shown. In humans, less is known about the potential of regeneration of the labrum. Recent studies seem to confirm labral regrowth, but it is still unclear if wide excision might be a surgical option in cases where repair is not possible.

Questions/purposes

The purposes of this study were (1) to determine the extent of acetabular labrum regeneration after excision to the bony rim; and (2) to determine whether this procedure results in higher hip scores.

Methods

We reviewed all patients treated with surgical dislocation for symptomatic femoroacetabular impingement by a single surgeon at one institution between 2003 and 2008, of whom 14 underwent wide labral excision (of at least 60°) down to bone; we used this approach when there was an absence of reparable tissue. Of these 14, nine were available for voluntary reexamination. The mean age at surgery was 38 ± 9 SD years and the mean followup was 4 ± 1 SD years. All patients consented to a physical examination and an MRI arthrogram, which was evaluated for evidence of new tissue formation by four observers. A modified Harris hip score and the UCLA were recorded.

Results

Regrowth of a structure equivalent to normal labrum was not observed on the MRI arthrograms. Six of nine hips had segmental defects, bone formation was found in five, and the capsule was confluent with the new tissue in six. The mean Harris hip score at latest followup was 83 ± 14, and the mean UCLA score was 6 ± 2.

Conclusions

Resection of a nonreparable acetabular labrum down to a bleeding bony surface does not stimulate regrowth of tissue that appears to be capable of normal function by MR arthrography, and patients who underwent this procedure had lower hip scores at midterm than previously reported from the same institution for patients undergoing labral repair or sparse débridement. Based on these results, we believe that future studies should evaluate alternatives to reconstructing the labrum, perhaps using ligamentum teres, because resection seems neither to result in regrowth nor the restoration of consistently high hip scores.

Level of Evidence

Level IV, therapeutic study.
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Metadaten
Titel
No Regeneration of the Human Acetabular Labrum After Excision to Bone
verfasst von
Hermes H. Miozzari, MD
Marco Celia, MD
John M. Clark, MD, PhD
Stefan Werlen, MD
Florian D. Naal, MD
Hubert P. Nötzli, MD
Publikationsdatum
01.04.2015
Verlag
Springer US
Erschienen in
Clinical Orthopaedics and Related Research® / Ausgabe 4/2015
Print ISSN: 0009-921X
Elektronische ISSN: 1528-1132
DOI
https://doi.org/10.1007/s11999-014-4021-z

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