@article{oai:shiga-med.repo.nii.ac.jp:00003526,
 author = {奥村, 法昭 and 川崎, 拓 and 久保, 充彦 and 彌山, 峰史 and 三村, 朋大 and 熊谷, 康佑 and 前田, 勉 and 今井, 晋二 and OKUMURA, Noriaki and KAWASAKI, Taku and KUBO, Mitsuhiko and YAYAMA, Takafumi and MIMURA, Tomohiro and KUMAGAI, Kosuke and MAEDA, Tsutomu and IMAI, Shinji},
 issue = {1},
 journal = {Journal of orthopaedic surgery (Hong Kong)},
 month = {Mar},
 note = {PURPOSE:
Rheumatoid arthritis (RA) patients with secondary osteoarthritis (OA) in a knee joint following a total knee arthroplasty (TKA) procedure have been increasing. Here, we investigated osteophyte formation in knee joints of RA patients and associated factors., METHODS:
We retrospectively examined findings of 35 knees in 30 RA patients (26 females, 4 males; mean age: 63.0 years; median disease duration: 15 years) who underwent TKA, including preoperative anteroposterior view radiographs of the knee joint. Using the ImageJ software package, osteophyte size in the medial femur (MF), medial tibia (MT), lateral femur (LF), and lateral tibia (LT) regions was also determined., RESULTS:
The mean femorotibial angle was 179°, while Larsen grade was 2 in 1, 3 in 12, 4 in 18, and 5 in 2 patients. Osteophyte sizes in the MF, MT, LF, and LT regions were 37.2, 17.0, 27.2, and 4.57 mm2, respectively, and significantly greater in the medial compartment (MC; MF+MT) than the lateral compartment (LC; LF+LT) (p < 0.001). In varus cases, osteophyte size in the MC was significantly larger than normal and valgus cases (p = 0.0016). Furthermore, osteophyte size in the MC was negatively correlated with the inflammatory markers C-reactive protein (r = -0.492, p = 0.0027) and erythrocyte sedimentation rate (r = -0.529, p = 0.0016), whereas that in the LC was negatively correlated with disease activity (r = -0.589, p = 0.0023)., CONCLUSION:
Our results suggest that alignment and disease activity influence osteophyte formation in RA patients, with secondary OA a more prominent symptom in RA patients with controlled inflammation., Journal Article},
 title = {Effects of malalignment and disease activity on osteophyte formation in knees of rheumatoid arthritis patients.},
 volume = {28},
 year = {2020}
}