Long-term observation of marrow adipose tissue and trabecular bone in the rat proximal tibial epiphysis after anterior cruciate ligament reconstruction: effects of immobilization and non-weightbearing.

IF 1.6 4区 生物学 Q4 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Biotechnic & Histochemistry Pub Date : 2025-02-01 Epub Date: 2025-02-26 DOI:10.1080/10520295.2025.2470622
Akinori Kaneguchi, Kaoru Yamaoka, Junya Ozawa
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引用次数: 0

Abstract

Anterior cruciate ligament (ACL) injury and subsequent reconstruction induce marrow adipose tissue (MAT) accumulation accompanied by bone loss. Short-term immobilization or non-weightbearing after ACL reconstruction further promotes MAT accumulation. However, it is unclear if combining immobilization and non-weightbearing synergistically promotes MAT accumulation. Additionally, it is unknown whether MAT increase induced by immobilization or non-weightbearing can be reversed through remobilization or reloading. We aimed to address these questions. ACL-reconstructed rats were divided into four groups: no intervention, immobilization, non-weightbearing, or immobilization plus non-weightbearing. Immobilization and non-weightbearing were applied for 2 weeks, after which all rats were allowed to move unrestricted. Intact rats were used as controls. The marrow adiposity and trabecular bone in the proximal tibia were histologically assessed at 2-, 4-, and 12-weeks post-surgery. ACL reconstruction induced MAT accumulation and trabecular bone loss accompanied by increased osteoclastogenesis. Two weeks of immobilization and non-weightbearing after ACL reconstruction individually promoted MAT accumulation, but the combined use of these interventions had a similar impact on MAT accumulation as either of each intervention. Importantly, the increased MAT induced by immobilization or non-weightbearing did not reverse even after remobilization or reloading. Neither immobilization, non-weightbearing, nor both conditions combined after ACL reconstruction further decreased trabecular bone compared to no intervention. These findings suggest no synergistic effect of immobilization and non-weightbearing on MAT accumulation, and MAT accumulation induced by 2 weeks of both immobilization or non-weightbearing did not decrease even after at least 10 weeks of remobilization or reloading. MAT accumulation due to both immobilization and non-weightbearing did not have negative effects on trabecular bone.

前十字韧带(ACL)损伤和随后的重建会导致骨髓脂肪组织(MAT)堆积,并伴随骨质流失。前交叉韧带重建后的短期固定或不负重会进一步促进骨髓脂肪组织的积聚。然而,目前还不清楚固定和不负重是否会协同促进骨髓脂肪组织的积聚。此外,还不清楚固定或不负重引起的 MAT 增加是否可以通过重新固定或重新负重来逆转。我们旨在解决这些问题。前交叉韧带重建大鼠被分为四组:无干预组、固定组、非负重组或固定加非负重组。固定和非负重治疗持续两周,之后所有大鼠均可自由活动。完好无损的大鼠作为对照组。在手术后 2 周、4 周和 12 周,对胫骨近端骨髓脂肪和骨小梁进行组织学评估。前交叉韧带重建诱导了 MAT 的积累和骨小梁的丢失,并伴随着破骨细胞生成的增加。前交叉韧带重建术后两周的固定和不负重分别促进了MAT的积累,但综合使用这些干预措施对MAT积累的影响与单独使用其中一种干预措施的影响相似。重要的是,固定或不负重引起的 MAT 增加即使在重新固定或加载后也不会逆转。与不采取任何干预措施相比,前交叉韧带重建后的固定、不负重或两种情况的结合都不会进一步减少骨小梁。这些研究结果表明,固定和不负重对 MAT 的积累没有协同作用,即使经过至少 10 周的再固定或再负重,固定或不负重 2 周引起的 MAT 积累也不会减少。固定和不负重导致的 MAT 积累对骨小梁没有负面影响。
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来源期刊
Biotechnic & Histochemistry
Biotechnic & Histochemistry 生物-生物工程与应用微生物
CiteScore
3.40
自引率
6.20%
发文量
46
审稿时长
6-12 weeks
期刊介绍: Biotechnic & Histochemistry (formerly Stain technology) is the official publication of the Biological Stain Commission. The journal has been in continuous publication since 1926. Biotechnic & Histochemistry is an interdisciplinary journal that embraces all aspects of techniques for visualizing biological processes and entities in cells, tissues and organisms; papers that describe experimental work that employs such investigative methods are appropriate for publication as well. Papers concerning topics as diverse as applications of histochemistry, immunohistochemistry, in situ hybridization, cytochemical probes, autoradiography, light and electron microscopy, tissue culture, in vivo and in vitro studies, image analysis, cytogenetics, automation or computerization of investigative procedures and other investigative approaches are appropriate for publication regardless of their length. Letters to the Editor and review articles concerning topics of special and current interest also are welcome.
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