The rat osteoarthritis bone score for histological pathology relevant to human bone marrow lesions and pain.

ABSTRACT:

Objectives

Histological osteochondral characteristics of inflammation, fibrosis, vascularity, cartilage islands, vessels entering cartilage, thickened trabeculae and cysts are associated with bone marrow lesions (BMLs) in human knee osteoarthritis (OA). We identified and developed a method for scoring comparable pathology in two rat OA knee pain models.

Methods

Rats (n ​= ​8-10 per group) were injected with monoiodoacetate (MIA) or saline, or underwent meniscal transection (MNX) or sham surgery. Pain behaviour (weight bearing asymmetry and mechanical hindpaw withdrawal thresholds (PWTs)) were measured and knee samples obtained. Features associated with BMLs were evaluated using haematoxylin and eosin or Safranin-O stained knee sections. Sections were scored for chondropathy,

SUBMITTER: McWilliams DF 

PROVIDER: S-EPMC11665527 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature