Evaluation of Balance With Computerized Posturography Device and Clinical Tests in Patients With Postmenopausal Osteoporosis

Osteoporosis is a metabolic bone disease characterized by low bone mass, deterioration of bone tissue, and disruption of bone microarchitecture . It is known that the incidence of vertebral fractures in women with osteoporosis increases especially after the age of 50. In the United States, one in four women older than 50 years suffers at least one osteoporosis-related vertebral compression fractures. Approximately one-third of vertebral fractures become symptomatic . Vertebral fracture may cause increased dorsal kyphosis and, the center of gravity of the body moves forward. Impaired postural stability is associated with fall risk and functional disability .

Many authors argue that the osteoporotic vertebral fractures are associated with an increase in the thoracic curve. There are studies revealing that hyperkyphosis may be a clinically useful marker for history of vertebral fracture and also a risk factor for a new vertebral fracture. Postmenopausal women with vertebral fracture have a 4-fold increased risk of new fractures compared to whom without spinal fracture. Recent vertebral fractures have a strong impact on daily living activities and are significant predictors of poor performance in functional status of the patient. However this triangle among vertebral fractures, kyphosis and balance has not been well documented in the literature.

The vertebral fracture cascade phenomena raises the possibility that multiple factors, such as spinal characteristics, vertebral alignment, spinal curvature, and spinal loads, as well as low bone mineral density, may have an impact on falls and fractures. Vertebral fracture may cause sagittal imbalance which leading to postural instability and becomes a possible risk factor for falls. Especially in osteoporotic elderly; falls are associated with high morbidity and mortality. However the effect of a vertebral fracture, as a preventable risk factor on balance impairment has not been studied sufficiently. In this study, we aimed to assess the effect of the presence of a vertebral fracture on balance and physical performance and its additional contribution to fall and fracture risk in patients with postmenopausal osteoporosis.