Abstract
OBJECTIVES: To compare the hip and ankle range of motion and hip muscle strength in 8-11 year old novice female ballet dancers and controls. METHODS: Subjects were 77 dancers and 49 controls (mean (SD) age 9.6 (0.8) and 9.6 (0.7) years respectively). Supine right active hip external rotation (ER) and internal rotation (IR) were measured using an inclinometer. A turnout protractor was used to assess standing active turnout range. The measure of ER achieved from below the hip during turnout (non-hip ER) was calculated by subtracting hip ER range from turnout range, and hip ER:IR was derived by dividing ER range by IR range. Range of right weight bearing ankle dorsiflexion was measured in a standing lunge using two methods: the distance from the foot to the wall (in centimetres) and the angle of the shank to the vertical via an inclinometer (in degrees). Right calf muscle range was measured in weight bearing using an inclinometer. A manual muscle tester was used to assess right isometric hip flexor, internal rotator, external rotator, abductor, and adductor strength. RESULTS: Dancers had less ER (p<0.05) and IR (p<0.01) range than controls but greater ER:IR (p<0.01). Although there was no difference in turnout between groups, the dancers had greater non-hip ER. Dancers had greater range of ankle dorsiflexion than controls, measured in both centimetres (p<0.01) and degrees (p<0.05), but similar calf muscle range. After controlling for body weight, controls had stronger hip muscles than dancers except for hip abductor strength which was similar. Regression analyses disclosed a moderate relation between turnout and hip ER (r = 0.40). There were no significant correlations between range of motion and training years and weekly training hours. CONCLUSIONS: Longitudinal follow up will assist in determining whether or not hip and ankle range in young dancers is genetically fixed and unable to be improved with further balletic training.
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Selected References
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- Bauman P. A., Singson R., Hamilton W. G. Femoral neck anteversion in ballerinas. Clin Orthop Relat Res. 1994 May;(302):57–63. [PubMed] [Google Scholar]
- Bennell Kim L., Talbot Richard C., Wajswelner Henry, Techovanich Wassana, Kelly David H., Hall Andrew J. Intra-rater and inter-rater reliability of a weight-bearing lunge measure of ankle dorsiflexion. Aust J Physiother. 1998;44(3):175–180. doi: 10.1016/s0004-9514(14)60377-9. [DOI] [PubMed] [Google Scholar]
- Bowling A. Injuries to dancers: prevalence, treatment, and perceptions of causes. BMJ. 1989 Mar 18;298(6675):731–734. doi: 10.1136/bmj.298.6675.731. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Gilbert C. B., Gross M. T., Klug K. B. Relationship between hip external rotation and turnout angle for the five classical ballet positions. J Orthop Sports Phys Ther. 1998 May;27(5):339–347. doi: 10.2519/jospt.1998.27.5.339. [DOI] [PubMed] [Google Scholar]
- Hamilton W. G., Hamilton L. H., Marshall P., Molnar M. A profile of the musculoskeletal characteristics of elite professional ballet dancers. Am J Sports Med. 1992 May-Jun;20(3):267–273. doi: 10.1177/036354659202000306. [DOI] [PubMed] [Google Scholar]
- Keating J. L., Matyas T. A. The influence of subject and test design on dynamometric measurements of extremity muscles. Phys Ther. 1996 Aug;76(8):866–889. doi: 10.1093/ptj/76.8.866a. [DOI] [PubMed] [Google Scholar]
- Khan K., Brown J., Way S., Vass N., Crichton K., Alexander R., Baxter A., Butler M., Wark J. Overuse injuries in classical ballet. Sports Med. 1995 May;19(5):341–357. doi: 10.2165/00007256-199519050-00004. [DOI] [PubMed] [Google Scholar]
- Khan K., Roberts P., Nattrass C., Bennell K., Mayes S., Way S., Brown J., McMeeken J., Wark J. Hip and ankle range of motion in elite classical ballet dancers and controls. Clin J Sport Med. 1997 Jul;7(3):174–179. doi: 10.1097/00042752-199707000-00004. [DOI] [PubMed] [Google Scholar]
- Kirkendall D. T., Calabrese L. H. Physiological aspects of dance. Clin Sports Med. 1983 Nov;2(3):525–537. [PubMed] [Google Scholar]
- Micheli L. J., Gillespie W. J., Walaszek A. Physiologic profiles of female professional ballerinas. Clin Sports Med. 1984 Jan;3(1):199–209. [PubMed] [Google Scholar]
- Reid D. C., Burnham R. S., Saboe L. A., Kushner S. F. Lower extremity flexibility patterns in classical ballet dancers and their correlation to lateral hip and knee injuries. Am J Sports Med. 1987 Jul-Aug;15(4):347–352. doi: 10.1177/036354658701500409. [DOI] [PubMed] [Google Scholar]
- Reid D. C. Prevention of hip and knee injuries in ballet dancers. Sports Med. 1988 Nov;6(5):295–307. doi: 10.2165/00007256-198806050-00005. [DOI] [PubMed] [Google Scholar]
- Sammarco G. J. The dancer's hip. Clin Sports Med. 1983 Nov;2(3):485–498. [PubMed] [Google Scholar]
- Trepman E., Gellman R. E., Solomon R., Murthy K. R., Micheli L. J., De Luca C. J. Electromyographic analysis of standing posture and demi-plié in ballet and modern dancers. Med Sci Sports Exerc. 1994 Jun;26(6):771–782. doi: 10.1249/00005768-199406000-00018. [DOI] [PubMed] [Google Scholar]