Effects of zoledronic acid on physiologic bone remodeling of condylar part of TMJ: a radiologic and histomorphometric examination in rabbits

The temporomandibular joints disorders in patients with osteoporosis

Background:

Osteoporosis is a skeletal and progressive behavioral disease with physically and psychologically significant consequences.

Aims of the Study:

Evaluate the presence and effects of Temporomandibular Joints Disorders in osteoporotic patients.

Materials and Methods:

Fifty-eight (58) patients with osteoporosis participated in this study as they were already diagnosed by Rheumatologists, physical and sport Rehabilitation physicians in Merjan Medical city/Babylon – Iraq between period February and August 2019.

Results:

Twenty-seven (27) patients with T. M. J clicking as anterior disk displacements, Seventeen (17) patients with spasm in muscles of mastication, and then finally Fourteen (14) out of 58 patients with subluxation and dislocation.

Conclusions:

Osteoporosis can have a significant impact on oral health.

Evaluation of musculoskeletal phenotype of the G608G progeria mouse model with lonafarnib, pravastatin, and zoledronic acid as treatment groups

Hutchinson-Gilford progeria syndrome (HGPS) is a uniformly fatal condition that is especially prevalent in skin, cardiovascular, and musculoskeletal systems. A wide gap exists between our knowledge of the disease and a promising treatment or cure. The aim of this study was to first characterize the musculoskeletal phenotype of the homozygous G608G BAC-transgenic progeria mouse model, and to determine the phenotype changes of HGPS mice after a five-arm preclinical trial of different treatment combinations with lonafarnib, pravastatin, and zoledronic acid. Microcomputed tomography and CT-based rigidity analyses were performed to assess cortical and trabecular bone structure, density, and rigidity. Bones were loaded to failure with three-point bending to assess strength. Contrast-enhanced µCT imaging of mouse femurs was performed to measure glycosaminoglycan content, thickness, and volume of the femoral head articular cartilage. Advanced glycation end products were assessed with a fluorometric assay. The changes demonstrated in the cortical bone structure, rigidity, stiffness, and modulus of the HGPS G608G mouse model may increase the risk for bending and deformation, which could result in the skeletal dysplasia characteristic of HGPS. Cartilage abnormalities seen in this HGPS model resemble changes observed in the age-matched WT controls, including early loss of glycosaminoglycans, and decreased cartilage thickness and volume. Such changes might mimic prevalent degenerative joint diseases in the elderly. Lonafarnib monotherapy did not improve bone or cartilage parameters, but treatment combinations with pravastatin and zoledronic acid significantly improved bone structure and mechanical properties and cartilage structural parameters, which ameliorate the musculoskeletal phenotype of the disease.

Effects of bisphosphonate treatment on mandibular condyle tissues of temporomandibular joint: A stereological study

INTRODUCTION

Although the adverse effects due to the use of bisphosphonates, such as bisphosphonate-induced osteonecrosis of the jaw, are reported previously, whether adverse events of the temporomandibular joint related with bisphosphonate treatment have been still unclear. Therefore, the aim of this study is to evaluate the effects of BP treatment on the condylar tissues of the temporomandibular joint due to fibrous cartilage, hyaline cartilage and bone-specific differences in rat animal models.

MATERIAL AND METHOD

A total of 12 adult Wistar-Albino rats, weighing from 250 to 300 g were included to the study. The animals were randomly divided into two groups. 0.1 mg/kg Zoledronic Acid were administrated to the animals intraperitoneally in the experimental bisphosphonate group for 60 days. Rest of the animals left as healthy control. All the animals were sacrificed at the end of 60 days. Two condyles were obtained from each animal and total 12 condyles were included to histological analysis in each group. The fibrous cartilage volume, hyaline cartilage volume and bone volume of the condyle were calculated using Cavalieri method. Statistical analysis was performed with Turcosa software.

RESULTS

There is a statistically significant difference of fibrous cartilage (P = 0.003) and bone volume between groups (P = 0.002). However, mean hyaline cartilage volume does not statistically differ between groups (P = 0.47). Bone volume and firbrous cartilage volume were increased in bisphosphonate group than control.

CONCLUSION

According to our study results Zoledronic Acid treatment did not affect the hyaline cartilage volume however fibrocartilage volume and bone volume were increased when the animals received ZA intraperitoneally for 60 days.