Immunohistochemical stain for neutrophil elastase of the periarticular tissue from patients with arthrofibrosis. Representative immunohistochemical results are shown for (A) elastase in the fibrous and (B) in the vascular regions of the tissue. A positive control of a neutrophil rich bone marrow sample is shown in (C). Magnification 200× with 400× insets, micron bar equals 100 μm.
Freeman et al. Fibrogenesis & Tissue Repair 2009 2:5 doi:10.1186/1755-1536-2-5