Showing papers by "Hylton B. Menz published in 2003"

A Physiological Profile Approach to Falls Risk Assessment and Prevention

Abstract: The purpose of this perspective article is to describe the use of a physiological profile approach to falls risk assessment and prevention that has been developed by the Falls and Balance Research Group of the Prince of Wales Medical Research Institute, Sydney, Australia. The profile's use for people with a variety of factors that put them at risk for falls is discussed. The Physiological Profile Assessment (PPA) involves a series of simple tests of vision, peripheral sensation, muscle force, reaction time, and postural sway. The tests can be administered quickly, and all equipment needed is portable. The results can be used to differentiate people who are at risk for falls ("fallers") from people who are not at risk for falls ("nonfallers"). A computer program using data from the PPA can be used to assess an individual's performance in relation to a normative database so that deficits can be targeted for intervention. The PPA provides valid and reliable measurements that can be used for assessing falls risk and evaluating the effectiveness of interventions and is suitable for use in a range of physical therapy and health care settings.

Age‐related differences in walking stability

Abstract: Background: a large proportion of falls in older people occur when walking; however the mechanisms underlying impaired balance during gait are poorly understood. Objective: to evaluate acceleration patterns at the head and pelvis in young and older subjects when walking on a level and an irregular walking surface, in order to develop an understanding of how ageing affects postural responses to challenging walking conditions. Methods: temporo-spatial gait parameters and variables derived from acceleration signals were recorded in 30 young people aged 22–39 years (mean 29.0, SD 4.3), and 30 older people with a low risk of falling aged 75–85 years (mean 79.0, SD 3.0) while walking on a level and an irregular walking surface. Subjects also underwent tests of vision, sensation, strength, reaction time and balance. Results: older subjects exhibited a more conservative gait pattern, characterised by reduced velocity, shorter step length and increased step timing variability. These differences were particularly pronounced when walking on the irregular surface. The magnitude of accelerations at the head and pelvis were generally smaller in older subjects; however the smoothness of the acceleration signals did not differ between the two groups. Older subjects performed worse on tests of vision, peripheral sensation, strength, reaction time and balance. Conclusion: the adoption of a more conservative basic gait pattern by older people with a low risk of falling reduces the magnitude of accelerations experienced by the head and pelvis when walking, which is likely to be a compensatory strategy to maintain balance in the presence of age-related deficits in physiological function, particularly reduced lower limb strength.

Acceleration patterns of the head and pelvis when walking are associated with risk of falling in community-dwelling older people.

Abstract: Background. A large proportion of falls in older people occur when walking, however the mechanisms underlying impaired balance during gait are poorly understood. This study evaluated acceleration patterns of the head and pelvis when walking on a level and an unpredictably irregular surface to determine whether older people at risk of falling demonstrate an impaired ability to stabilize the body under challenging conditions. Methods. One hundred community-dwelling older people aged between 75 and 93 years were evaluated for their risk of falling using a range of physiological tests previously found to be accurate predictors of falling in prospective studies. Temporo-spatial gait parameters and acceleration patterns at the head and pelvis were then measured in three orthogonal planes while subjects walked on a flat corridor and an unpredictably irregular walkway. Harmonic ratios of head and pelvis accelerations in each plane were calculated to provide an indicator of stability. Results. Subjects with a high risk of falling exhibited reduced temporo-spatial gait parameters and increased step timing variability. Harmonic ratios of acceleration patterns were reduced at the head and pelvis in the vertical and anteroposterior directions. These differences were particularly evident when walking on the irregular surface. Conclusion. Older people at risk of falling adopt a more conservative basic walking pattern, but this does not ensure that the movements of the head and pelvis are stable. The irregular pelvis and head accelerations evident in the high risk group suggests that these subjects may have difficulty controlling trunk motion and maintaining a stable visual field when walking, particularly on irregular terrain.

An evaluation of footwear worn at the time of fall‐related hip fracture

Abstract: Background: a range of footwear features have been shown to influence balance in older people, however, little is known about the relationships between inappropriate footwear, falls and hip fracture. Objectives: to describe the characteristics of footwear worn at the time of fall-related hip fracture and establish whether the features of the shoe influenced the type of fall associated with the fracture. Methods: 95 older people (average age 78.3 years, SD 7.9) who had suffered a fall-related hip fracture were asked to identify the footwear they were wearing when they fell. Footwear characteristics were then evaluated using a standardised assessment form. Information was also collected on the type and location of fall. Results: the most common type of footwear worn at the time of the fall was slippers (22%), followed by walking shoes (17%) and sandals (8%). Few subjects were wearing high heels when they fell (2%). The majority of subjects (75%) wore shoes with at least one theoretically sub-optimal feature, such as absent fixation (63%), excessively flexible heel counters (43%) and excessively flexible soles (43%). Subjects who tripped were more likely to be wearing shoes with no fixation compared to those who reported other types of falls [x 2 =4.21, df=1, P=0.033; OR=2.93 (95%CI 1.03‐8.38)]. Conclusions: many older people who have had a fall-related hip fracture were wearing potentially hazardous footwear when they fell. The wearing of slippers or shoes without fixation may be associated with increased risk of tripping. Prospective studies into this proposed association appear warranted.

Reliability of clinical tests of foot and ankle characteristics in older people.

Abstract: Lower-extremity problems are common in older people; however, the reliability of clinical tools used to assess foot and ankle characteristics has not been rigorously evaluated. This study evaluated the test‐retest reliability of a battery of simple clinical tests of foot and ankle characteristics (tactile sensitivity of the first metatarsophalangeal joint, navicular height, foot length and width, hallux valgus severity, an overall foot problem score, ankle flexibility, ankle dorsiflexion strength, and foot pain) in 31 individuals (13 men and 18 women) aged 76 to 87 years recruited from the community. Three examiners performed the tests on two occasions approximately 2 weeks apart. Intraclass correlation coefficients and coefficients of variation were calculated for continuously scored tests, and the kappa statistic (κ) was used to determine the reliability of hallux valgus severity grading. All of the continuously scored tests had acceptable reliability (intraclass correlation coefficients of 0.64 to 0.98; coefficients of variation of 0.6% to 15.0%), as did hallux valgus severity grading (κ = 0.77; absolute percentage agreement, 84%). These simple clinical tests can now be used with confidence in clinical and research settings to provide reliable and functionally important information regarding foot and ankle characteristics in older people. (J Am Podiatr Med Assoc 93(5): 380-387, 2003)

The Influence of Geriatrics Education on Knowledge, Attitudes, and Career Aspirations of Podiatric Medical Students

Abstract: A survey of podiatric medical students in Australia was undertaken prior to and following the completion of a compulsory geriatrics course to evaluate the effect of geriatrics education on knowledge of aging, attitudes toward older people, perceptions of treatment efficacy, and desire to specialize in geriatrics. Students had a reasonable knowledge of aging and favorable attitudes toward older people prior to undertaking the course, but few wanted to specialize in geriatrics. General knowledge of aging and attitudes toward older people improved after completion of the course, but career aspirations remained unchanged. Students generally considered geriatrics to be a low-profile specialty, and less than half stated that they would be interested in pursuing continuing education in geriatrics. These results provide further evidence that students' lack of desire to specialize in geriatrics may be primarily due to limited recognition within the profession, rather than unfavorable attitudes toward older people or lack of interest in geriatrics during their undergraduate education.

Knowledge of aging and attitudes toward older people. A survey of Australian podiatric medical students.

Abstract: Podiatric medical students in Australia were surveyed to evaluate their reasons for entering podiatric medicine, knowledge of aging, attitudes toward older people, perceptions of treatment efficacy, and desire to specialize in geriatrics. Few students plan to specialize in geriatrics upon graduation (4%), with most preferring general practice (25%) or sports medicine (21%). However, knowledge of aging was good, and students had favorable attitudes toward older people and considered treatment of older people to be effective. Few age- or gender-related effects were observed. It is concluded that students' lack of desire to specialize in geriatrics may be due not to unfavorable perceptions of older people but rather to the low profile and limited development of geriatrics as a specialty area within the podiatric medical profession.