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Urabe Y.1, Numano S.1, Nakayama S.2, Li S.2, Tsukimura N.2, Iwakura N.2, Arimoto K.3, Maeda N.1
1Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan, 2Medical Committee of Japan Basketball Association, Tokyo, Japan, 3Medical Committee of Osaka Basketball Association, Osaka, Japan
Background: Rather than many other sports, basketball players are more like to bear significantly higher risk as well as real occurrence incident of ACL (Anterior Cruciate Ligament) injury or ankle sprain injury the cause of which is mainly the frequent repetition of the dash, stop and cutting movements. Scientific studies shows that prevention of ACL injury mainly includes improvement of muscle power, balance, correct posture and leg alignment following the sports movements. Nevertheless, quite a trifle amount of research data is available regarding the balance ability of high school basketball players.
Purpose: Main purpose of this study was to identify relationship between balancing ability and anthropometric characteristics and to further help the technical development of the ACL injury prevention.
Methods: Data was collected from 150 male and 283 female high school basketball player students during the Hiroshima City all Japan High School Athletic Meet. The measurement procedures were one leg standing time with closing eyes as static balance ability, general joints laxity (GJL), hallux valgus, navicular arch quantity, valgus knee, toeing-out, etc. EZR Ver.1.32 was used for statistical analysis. Subjects were categorized into two groups through comparing static balance ability with high & low scoring group parameter of standing over 30 seconds and under 30 seconds respectively. Univariate analysis using the Fisher´s exact test and logistic-regression models were used to estimate effects of static balance ability. Considered P value was 5%.
Results: In case of one leg standing, lower group result is 82 male (10.7±7.5 sec) and 160 female (12.4±7.7 sec) and higher group is 62 male (53.3±10.2 sec) and 123 female (54.0±9.9 sec ). 16 male and 40 female had large knee valgus and 50 male and 51 female showed toeing-out. In univariate analysis result, an association was found among one leg standing with hallux valgus, GJL of knee joint and the ankle in male and navicular arch quantity in women. This clearly indicates that recruvatom knee and restricted ankle dorsiflexion angle affects static balance ability for male and foot anthropometric effects upon female.
Conclusion(s): This study highlights that anthropometric characteristics in static balance ability are different for male & female. However, increasing knee valgus that bears potential risk of ACL injury may possess no relation with static balance ability. Effective preventive measure for male basketball players is to improve ankle flexibility and checking whether they showed recruvatom knee. On the other hand, for female, it is important to adjust and evaluate the pronated foot. Most importantly, when supporting the basketball players, physiotherapists should pay utmost attention towards these lower extremity alignments.
Implications: This study represents a highly useful indicator to facilitate individual intervention of injury prevention to improve the static balance ability of high school basketball players.
Funding acknowledgements: No funding acknowledgement was available for this study.
Topic: Sport & sports injuries
Ethics approval: Participants were duly informed about this protocol which was approved by the Medical Committee of Japan Basketball Association.
All authors, affiliations and abstracts have been published as submitted.
