Histopathological, immunohistochemical criteria and confocal laser-scanning data of arthrofibrosis.
Arthrofibrosis (af) is defined as a fibrosing disease of the synovial membrane, after joint operations, with painful restricted range of motion. The aim of this paper was to describe the histopathological substrate of af, hitherto only defined by clinical criteria. Based on a group of 222 tissue samples, the characteristic changes to af were analyzed. The control group comprised 29 cases with neosynovialis of the indifferent type. Due to cytoplasmic SM-actin positivity and the absence of specific cytoplasmic reactivity in CD 68 representation, af fibroblasts were characterized as myofibroblasts. In confocal laser-scanning microscopy, β-catenin-positive aggregates were detected in the cytoplasm. Over and above this, unequivocal colocalization of β-catenin and the tight junction protein ZO-1 became manifest, particularly on the cell membrane and, partly, in the cytoplasm. A threshold value of 20 β-catenin-positive cells/HPF was determined. This enables the histopathological diagnosis of an af to be made (sensitivity: 0.733, specificity: 0.867). Af is a fibrosing disease of the synovial membrane with variable grade of fibrotization (fibroblast cellularity). A threshold value of 20 β-catenin-positive fibroblasts per HPF was defined, which enables the histopathological diagnosis of af.
Zentrum für Histologie, Zytologie und Molekulare Diagnostik, Max-Planck-Straße 18+20, D-54296 Trier, Germany. Electronic address: m.ruppert83@gmx.de.
M
M
Ruppert
C
C
Theiss
P
P
Knöß
D
D
Kendoff
M G
MG
Krukemeyer
N
N
Schröder
B
B
Brand-Saberi
T
T
Gehrke
V
V
Krenn
D000199:Actins / Q000032:analysis; D015703:Antigens, CD / Q000032:analysis; D015214:Antigens, Differentiation, Myelomonocytic / Q000032:analysis; D015415:Biomarkers / Q000032:analysis; D001706:Biopsy; D016022:Case-Control Studies; D005355:Fibrosis; D006801:Humans; D007150:Immunohistochemistry; D007592:Joint Diseases / Q000175:diagnosis* / Q000378:metabolism / Q000473:pathology; D018613:Microscopy, Confocal; D058628:Myofibroblasts / Q000737:chemistry / Q000473:pathology; D011183:Postoperative Complications / Q000175:diagnosis* / Q000378:metabolism / Q000473:pathology; D011237:Predictive Value of Tests; D012720:Severity of Illness Index; D013583:Synovial Membrane / Q000737:chemistry* / Q000473:pathology*; D062826:Zonula Occludens-1 Protein / Q000032:analysis; D051176:beta Catenin / Q000032:analysis*; D000097382:CD68 Molecule
D000199:Actins; D015703:Antigens, CD; D015214:Antigens, Differentiation, Myelomonocytic; D015415:Biomarkers; D062826:Zonula Occludens-1 Protein; D051176:beta Catenin; C541116:ACTA2 protein, human; C067980:CD68 antigen, human; D000097382:CD68 Molecule; C495270:CTNNB1 protein, human; C569042:TJP1 protein, human
Arthrofibrosis; Confocal laser-scanning microscopy; Periprosthetic membrane; Prosthesis failure; β-Catenin