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Temporary inductions of matrix metalloprotease‐3 (MMP‐3) expression and cell apoptosis are associated with tendon degeneration or rupture after corticosteroid injection
Author(s) -
Muto Tomoyuki,
Kokubu Takeshi,
Mifune Yutaka,
Inui Atsuyuki,
Harada Yoshifumi,
Takase Fumiaki,
Kuroda Ryosuke,
Kurosaka Masahiro
Publication year - 2014
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.22681
Subject(s) - corticosteroid , triamcinolone acetonide , tendon , medicine , achilles tendon , saline , tendinopathy , matrix metalloproteinase , pathology , surgery
Corticosteroid injections are widely used to treat enthesopathy and tendinitis, but are also associated with possible side effects, such as tendon degeneration or rupture. However, the mechanism of tendon degeneration or rupture after corticosteroid injection remains controversial. The purpose of this study was to reveal the mechanism of tendon degeneration or rupture after injection of triamcinolone acetonide (TA) or prednisolone (PSL). Forty‐two rats were divided into 3 groups: A normal saline injection group (control group), a TA injection group, and a PSL injection group; the normal saline or corticosteroid was injected around the Achilles tendon. One or 3 weeks after injection, the tendons were subjected to biomechanical testing and histological analysis. At 1 week, the biomechanical strength was significantly lower in the corticosteroid groups. Histological analysis, at 1‐week post‐injection, showed collagen attenuation, increased expression of MMP‐3 and apoptotic cells in the corticosteroid groups. The histological changes and biomechanical weaknesses of the tendon were not seen at 3 weeks. These alterations appeared to be involved in tendon degeneration or rupture after corticosteroid injection. © 2014 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 32:1297–1304, 2014.