Objective To study the effects of an abnormal mechanical load in the developmental dysplasia of the hip(DDH)on the bone microstructure and blood vessels of the subchondral bone,and the correlation between bone microstructure and blood vessels.Methods A newborn rat DDH model was constructed using the swaddling method.Histological staining such as hematoxylin-eosin staining,safranin-fast green staining,and immunohistochemical staining was performed on the articular cartilage and subchondral bone of the femoral head.The microstructure of the subchondral bone was analyzed using microcomputed tomography(micro-CT).Results The DDH rats showed degeneration of the articular cartilage accompanied by deterioration of the microstructure of the subchondral bone,decreased bone formation,and increased vascular formation.The level of vascular formation in the subchondral bone was positively correlated with the degree of deterioration of the bone microstructure.Conclusions An abnormal mechanical load in the DDH causes articular cartilage degeneration,increased vascular formation in the subchondral bone,and subchondral bone microstructure deterioration.The correlation analysis revealed that the abnormal vascular formation in the subchondral bone may be an important factor causing the deterioration of bone microstructure and progression of DDH.This study has provided a new direction for the development of DDH.

Objective To study the effects of an abnormal mechanical load in the developmental dysplasia of the hip(DDH)on the bone microstructure and blood vessels of the subchondral bone,and the correlation between bone microstructure and blood vessels.Methods A newborn rat DDH model was constructed using the swaddling method.Histological staining such as hematoxylin-eosin staining,safranin-fast green staining,and immunohistochemical staining was performed on the articular cartilage and subchondral bone of the femoral head.The microstructure of the subchondral bone was analyzed using microcomputed tomography(micro-CT).Results The DDH rats showed degeneration of the articular cartilage accompanied by deterioration of the microstructure of the subchondral bone,decreased bone formation,and increased vascular formation.The level of vascular formation in the subchondral bone was positively correlated with the degree of deterioration of the bone microstructure.Conclusions An abnormal mechanical load in the DDH causes articular cartilage degeneration,increased vascular formation in the subchondral bone,and subchondral bone microstructure deterioration.The correlation analysis revealed that the abnormal vascular formation in the subchondral bone may be an important factor causing the deterioration of bone microstructure and progression of DDH.This study has provided a new direction for the development of DDH.

The objective was to investigate the effect of kinsenoside (Kin) treatments on macrophage polarity and evaluate the resulting protection of chondrocytes to attenuate osteoarthritis (OA) progression. RAW264.7 macrophages were polarized to M1/M2 subtypes then administered with different concentrations of Kin. The polarization transitions were evaluated with quantitative real-time polymerase chain reaction (qRT-PCR), confocal observation and flow cytometry analysis. The mechanism of Kin repolarizing M1 macrophages was evaluated by Western blot. Further, macrophage conditioned medium (CM) and IL-1 were administered to chondrocytes. Micro-CT scanning and histological observations were conducted on anterior cruciate ligament transection (ACLT) mice with or without Kin treatment. We found that Kin repolarized M1 macrophages to the M2 phenotype. Mechanistically, Kin inhibited the phosphorylation of IB, which further reduced the downstream phosphorylation of P65 in nuclear factor-B (NF-B) signaling. Moreover, Kin inhibited mitogen-activated protein kinases (MAPK) signaling molecules p-JNK, p-ERK and p-P38. Additionally, Kin attenuated macrophage CM and IL-1-induced chondrocyte damage. , Kin reduced the infiltration of M1 macrophages, promoted M2 macrophages in the synovium, inhibited subchondral bone destruction and reduced articular cartilage damage induced by ACLT. All the results indicated that Kin is an effective therapeutic candidate for OA treatment.

Objective To compare the efficacy of fixed bearing(FB) and rotating bearing(RB) in total knee arthroplasty (TKA) for knee valgus. Methods Data of 203 cases with valgus knee deformity who had undergone TKA procedure from January 2007 to December 2013 were retrospectively analyzed. 181 cases were primary joint replacement. They were divided into FB group and RB group. 168 patients (168 knees) were followed?up for more than 2 years. 83 cases (83 knees) were in FB group, and 85 cases (85knees) were in RB group. There were 57 males and 111 females, aged from 40 to 79 years, with an average age of 59.3 ± 7.2 years. Among them, 153 cases were osteoarthritis and 15 cases were rheumatoid arthritis. Activities of the knee , tibio?femoral angle on X?ray, Hospital for Special Surgery (Hospital for Special Surgery, HSS) knee score and the SF?36 scale scores were recorded before surgery and at the final follow?up. Results All patients were followed up for 24 to 84 months (average, 37.4 months). The average knee activities of the fixed bearing and rotating mobile bearing were from 72.8°±13.1°and 71.2°±12.8° be?fore surgery to 106.5°±9.8°and 115.4°±7.9° at final follow?up. The average tibiofemoral angle on X?ray decreased from 16.8°±5.3° and 15.2° ± 4.7° preoperatively to 5.6° ± 2.3 and 5.2° ± 2.1° at the final follow?up. The HSS knee score improved from 47.5 ± 7.1 points and 49.6±8.9 points to 89.1±4.6 points and 90.2±5.3 points at final follow?up. The SF?36 scale scores improved from 52.3± 15.4 points and 50.1±17.9 points to 81.6±12.3 points and 82.2±14.5 points at the final follow?up. At the latest follow?up, except the Range of motion, there were no statistically significant in any other indicator between two groups. Two cases appeared postoper?ative deep venous thrombosis symptoms. One case had joint stiffness early, and the symptoms improved after strengthen functional exercise. No infections, delayed knee instability, implant loosening or subsidence was found during the follow?up. Conclusion For patients with mild to moderate knee valgus, both fixed and rotating bearing with same soft tissue balance technique can improve the knee function and correct the valgus deformity, and the recent results are satisfactory.