Skip to main content
  • Meeting abstract
  • Open access
  • Published:

Analysis of ankle inversion sprain injury mechanism from accidental injury cases captured in televised basketball matches


The aim of this study was to use model-based image matching method (MBIM) to study ankle inversion sprain injury mechanism from basketball cases. MBIM can be used to understand the injury mechanism quantitatively by analyzing the three-dimensional human motion [1].


An ankle inversion sprain injury occurred in a televised basketball match was found from the internet. The videos were transformed into uncompressed AVI image sequence by using Adobe Premiere Pro (CS4, Adobe Systems Inc, San Jose, California). Then the image sequences were synchronized and rendered into 1-Hz video sequences by Adobe After-Effects (CS4, Adobe Systems Inc). 3-dimension animation software Poser 4 and Poser Pro Pack (Curious Labs Inc, Santa Cruz, California) were used to perform the matching part. Virtual environment was built according to the real dimensions of a basketball court and it was manually matched to the background for each frame in every single camera view. The skeleton model from Zygote Media Group Inc. (Provo, Utah) was used to match with the athlete. The segment dimensions were adjusted according to the subject’s height. The skeleton matching started with the hip, thigh, shank segment and then distally matched the foot and toe segments frame by frame. The ankle time histories were input into Microsoft Excel (Microsoft Office, Microsoft, US) to calculate the velocity-related information.


The peak inversion in this case lies within the range (48°-142°) obtained in previous studies [1]. Different from previous studies [1], plantarflexion is found at the time of peak ankle inversion during the injuring motion.

Table 1 Peak value of the ankle angles and velocities (inversion, internal rotation and plantarflexion) were shown in the table below. The lowest row indicates the duration of the ankle sprain injury.


The analysis of basketball ankle inversion ligamentous sprain case was done and compared with previous studies. Since no basketball cases have been analyzed before, so more basketball cases should be analyzed by MBIM in order to understand the real injury mechanism.


  1. Fong DTP, Ha SCW, Mok KM, Chan CWL, Chan KM: Kinematics analysis of ankle inversion ligamentous sprain injuries in sports - five cases from televised tennis competitions. The American Journal of Sports Medicine. 2012, 40 (11): 2627-2632. 10.1177/0363546512458259.

    Article  PubMed  Google Scholar 

Download references

Author information

Authors and Affiliations


Corresponding author

Correspondence to Sophia CW Ha.

Rights and permissions

Open Access  This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.

The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.

To view a copy of this licence, visit

The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated in a credit line to the data.

Reprints and permissions

About this article

Cite this article

Chan, K., Ha, S.C., Fong, D.T. et al. Analysis of ankle inversion sprain injury mechanism from accidental injury cases captured in televised basketball matches. J Foot Ankle Res 7 (Suppl 1), A30 (2014).

Download citation

  • Published:

  • DOI: