Associations between vertebral fractures, increased thoracic kyphosis, a flexed posture and falls in older adults: a prospective cohort study.

BACKGROUND: Vertebral fractures, an increased thoracic kyphosis and a flexed posture are associated with falls. However, this was not confirmed in prospective studies. We performed a prospective cohort study to investigate the association between vertebral fractures, increased thoracic kyphosis and/or flexed posture with future fall incidents in older adults within the next year. METHODS: Patients were recruited at a geriatric outpatient clinic. Vertebral fractures were evaluated on lateral radiographs of the spine with the semi-quantitative method of Genant; the degree of thoracic kyphosis was assessed with the Cobb angle. The occiput-to-wall distance was used to determine a flexed posture. Self-reported falls were prospectively registered by monthly phone contact for the duration of 12 months. RESULTS: Fifty-one older adults were included; mean age was 79 years (SD = 4.8). An increased thoracic kyphosis was independently associated with future falls (OR 2.13; 95% CI 1.10-4.51). Prevalent vertebral fractures had a trend towards significancy (OR 3.67; 95% CI 0.85-15.9). A flexed posture was not significantly associated with future falls. CONCLUSION: Older adults with an increased thoracic kyphosis are more likely to fall within the next year. We suggest clinical attention for underlying causes. Because patients with increased thoracic curvature of the spine might have underlying osteoporotic vertebral fractures, clinicians should be aware of the risk of a new fracture.

A flexed posture in elderly patients is associated with impairments in postural control during walking.

A flexed posture (FP) is characterized by protrusion of the head and an increased thoracic kyphosis (TK), which may be caused by osteoporotic vertebral fractures (VFs). These impairments may affect motor function, and consequently increase the risk of falling and fractures. The aim of the current study was therefore to examine postural control during walking in elderly patients with FP, and to investigate the relationship with geriatric phenomena that may cause FP, such as increased TK, VFs, frailty, polypharmacy and cognitive impairments. Fifty-six elderly patients (aged 80 ± 5.2 years; 70% female) walked 160 m at self-selected speed while trunk accelerations were recorded. Walking speed, mean stride time and coefficient of variation (CV) of stride time were recorded. In addition, postural control during walking was quantified by time-dependent variability measures derived from the theory of stochastic dynamics, indicating smoothness, degree of predictability, and local stability of trunk acceleration patterns. Twenty-five patients (45%) had FP and demonstrated a more variable and less structured gait pattern, and a more irregular trunk acceleration pattern than patients with normal posture. FP was significantly associated with an increased TK, but not with other geriatric phenomena. An increased TK may bring the body's centre of mass forward, which requires correcting responses, and reduces the ability to respond on perturbation, which was reflected by higher variation in the gait pattern in FP-patients. Impairments in postural control during walking are a major risk factor for falling: the results indicate that patients with FP have impaired postural control during walking and might therefore be at increased risk of falling.

Testing postural control among various osteoporotic patient groups: a literature review.

AIM: Osteoporosis can cause vertebral fractures, which might lead to a flexed posture, impaired postural control and consequently increased fall risk. Therefore, the aim of the present review was to examine whether postural control of patients with osteoporosis, vertebral fractures, thoracic kyphosis and flexed posture is affected. Furthermore, instruments measuring postural control were evaluated and examined for sensitivity and easy clinical use. METHODS: Until February 2011, electronic databases were systematically searched for cross-sectional studies. Methodological quality was assessed with a modified Downs & Black scale. RESULTS: Of the 518 found studies, 18 studies were included. Postural control was generally affected for patients with vertebral fractures, thoracic kyphosis and flexed posture. Patients with osteoporosis had impaired postural control when assessed with computerized instruments. Easy performance-based tests did not show any impairments. CONCLUSIONS: There is evidence for an impaired postural control in all patient groups included. Impaired postural control is an important risk factor for falls. Functional performance tests are not sensitive and specific enough to detect affected postural control in patients with osteoporosis. To detect impaired postural control among osteoporotic patients and to obtain more insight into the underlying mechanisms of postural control, computerized instruments are recommended, such as easy-to-use ambulant motion-sensing (accelerometry) technology.

Why do geriatric outpatients have so many moderate and severe vertebral fractures? Exploring prevalence and risk factors.

OBJECTIVES: to determine the prevalence of vertebral fractures and their risk factors in geriatric patients. DESIGN: prospective cohort study. SETTING: teaching hospital in Amsterdam, The Netherlands. SUBJECTS: three hundred and three geriatric patients, who had their first visit at a diagnostic day hospital between April and August 2007. MEASUREMENTS: lateral X-rays of the lumbar spine and chest were performed; vertebral fractures were scored according to the semi-quantitative method of Genant by trained observers and compared with the official report of radiologists. Co-morbidity, reported falls, mobility and cognitive function were scored. RESULTS: vertebral fractures were observed in 51% (156/303) of geriatric patients. Sixty-nine per cent (107/156) of these fractures were moderate to severe. In 21% (33/156) of the patients with a fracture, vertebral fractures were diagnosed on the lumbar spine X-ray alone. Patients with vertebral fractures had more previous non-vertebral fractures (odds ratio: 2.40 95% CI: 1.40-4.10), had lower serum albumin levels (OR: 0.92 95% CI: 0.87-0.97) and more current prednisone use (OR: 8.94 95% CI: 1.12-71.45). Co-morbidity and cognitive decline were not identified as risk factors. Radiologists reported vertebral fractures in 53% (82/156) of the cases. CONCLUSION: this study showed a very high prevalence of vertebral fractures in geriatric patients; particularly the high prevalence of moderate and severe fractures is remarkable. Because of this high prevalence, the routinely performed lateral X-ray of the chest should be used to look for vertebral fractures. An additional X-ray of the lumbar spine might be useful in patients without vertebral fractures on the chest X-ray.