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. 1998 Oct-Dec;33(4):323–327.

Examination of Balance Measures Produced by the Biodex Stability System

Brent L Arnold *, Randy J Schmitz †
PMCID: PMC1320582  PMID: 16558529

Abstract

Objective:

Our purpose was to establish normal patterns and relationships of stability using the Biodex Stability System.

Design and Setting:

The design of this study used both nonexperimental and quasi-experimental methods. All testing was performed in a university sports medicine laboratory.

Subjects:

Nineteen healthy subjects (8 males, 11 females, age = 24.4 ± 4.2 years; wt = 70.5 ± 20 kg; ht = 171.2 ± 11.7 cm) with no history of lower extremity injury participated in this study.

Measurements:

For data analysis, the medial/lateral stability index (MLSI), anterior/posterior stability index (APSI), overall stability index (OSI), and time-in-balance scores were recorded.

Results:

Multiple regression revealed that APSI and MLSI significantly contributed to the OSI, with the APSI accounting for 95% of the OSI variance. Additionally, the percentage of time spent between 0° and 5° from level was significantly greater than the time spent between 6° and 10°, 11° and 15°, and 16° and 20°. Furthermore, the percentage of time spent between 6° and 10° was significantly greater than the time spent between 16° and 20°.

Conclusions:

These data suggest that uninjured individuals spent the majority of the time balanced within 0° to 5° from level and progressively less time at greater angles. Additionally, the data suggest that the OSI is very closely related to the APSI and receives a relatively small contribution from the MLSI. Because of this small contribution, if the clinician is interested in both anterior-posterior and medial-lateral motions, it may be best to use the MLSI and APSI separately rather than the OSI.

Keywords: postural control, proprioception, regression analysis

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Cornwall M. W., Murrell P. Postural sway following inversion sprain of the ankle. J Am Podiatr Med Assoc. 1991 May;81(5):243–247. doi: 10.7547/87507315-81-5-243. [DOI] [PubMed] [Google Scholar]
  2. Ekdahl C., Jarnlo G. B., Andersson S. I. Standing balance in healthy subjects. Evaluation of a quantitative test battery on a force platform. Scand J Rehabil Med. 1989;21(4):187–195. [PubMed] [Google Scholar]
  3. Era P., Heikkinen E. Postural sway during standing and unexpected disturbance of balance in random samples of men of different ages. J Gerontol. 1985 May;40(3):287–295. doi: 10.1093/geronj/40.3.287. [DOI] [PubMed] [Google Scholar]
  4. Gauffin H., Tropp H., Odenrick P. Effect of ankle disk training on postural control in patients with functional instability of the ankle joint. Int J Sports Med. 1988 Apr;9(2):141–144. doi: 10.1055/s-2007-1024996. [DOI] [PubMed] [Google Scholar]
  5. Goldie P. A., Bach T. M., Evans O. M. Force platform measures for evaluating postural control: reliability and validity. Arch Phys Med Rehabil. 1989 Jul;70(7):510–517. [PubMed] [Google Scholar]
  6. Guskiewicz K. M., Perrin D. H. Effect of orthotics on postural sway following inversion ankle sprain. J Orthop Sports Phys Ther. 1996 May;23(5):326–331. doi: 10.2519/jospt.1996.23.5.326. [DOI] [PubMed] [Google Scholar]
  7. Harrison E. L., Duenkel N., Dunlop R., Russell G. Evaluation of single-leg standing following anterior cruciate ligament surgery and rehabilitation. Phys Ther. 1994 Mar;74(3):245–252. doi: 10.1093/ptj/74.3.245. [DOI] [PubMed] [Google Scholar]
  8. Murray M. P., Seireg A. A., Sepic S. B. Normal postural stability and steadiness: quantitative assessment. J Bone Joint Surg Am. 1975 Jun;57(4):510–516. [PubMed] [Google Scholar]
  9. Murray M. P., Seireg A., Scholz R. C. Center of gravity, center of pressure, and supportive forces during human activities. J Appl Physiol. 1967 Dec;23(6):831–838. doi: 10.1152/jappl.1967.23.6.831. [DOI] [PubMed] [Google Scholar]
  10. Sahlstrand T., Ortengren R., Nachemson A. Postural equilibrium in adolescent idiopathic scoliosis. Acta Orthop Scand. 1978 Aug;49(4):354–365. doi: 10.3109/17453677809050088. [DOI] [PubMed] [Google Scholar]
  11. Stribley R. F., Albers J. W., Tourtellotte W. W., Cockrell J. L. A quantitative study of stance in normal subjects. Arch Phys Med Rehabil. 1974 Feb;55(2):74–80. [PubMed] [Google Scholar]
  12. THOMAS D. P., WHITNEY R. J. Postural movements during normal standing in man. J Anat. 1959 Oct;93:524–539. [PMC free article] [PubMed] [Google Scholar]
  13. Tropp H., Ekstrand J., Gillquist J. Stabilometry in functional instability of the ankle and its value in predicting injury. Med Sci Sports Exerc. 1984;16(1):64–66. [PubMed] [Google Scholar]
  14. Tropp H., Odenrick P. Postural control in single-limb stance. J Orthop Res. 1988;6(6):833–839. doi: 10.1002/jor.1100060607. [DOI] [PubMed] [Google Scholar]
  15. Tropp H. Pronator muscle weakness in functional instability of the ankle joint. Int J Sports Med. 1986 Oct;7(5):291–294. doi: 10.1055/s-2008-1025777. [DOI] [PubMed] [Google Scholar]
  16. Wegener L., Kisner C., Nichols D. Static and dynamic balance responses in persons with bilateral knee osteoarthritis. J Orthop Sports Phys Ther. 1997 Jan;25(1):13–18. doi: 10.2519/jospt.1997.25.1.13. [DOI] [PubMed] [Google Scholar]

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