Knee Surgery, Sports Traumatology, Arthroscopy

, Volume 24, Issue 1, pp 279–286 | Cite as

A novel clinical approach for assessing hop landing strategies: a 2D telescopic inverted pendulum (TIP) model

  • Robert Letchford
  • Kate Button
  • Paul Adamson
  • Paulien E. Roos
  • Valerie Sparkes
  • Robert W. M. van Deursen
Knee

Abstract

Purpose

Single leg hop for distance is used to inform rehabilitation and return to sport following anterior cruciate ligament reconstruction. However, impairment of landing mechanics may persist after the recommended performance parameter (hop distance) has been met; therefore, alternative methods are required. This study follows the COSMIN guideline to investigate the measurement properties of data from a new instrument (2D TIP). This is a simple motion analysis instrument to assess landing strategy based on more complex biomechanical modelling.

Methods

Data collected in the clinical setting from 30 subjects with chronic ACL deficiency (mean 15.5, SD 4.3 months following injury) before and 6 months after ACL reconstruction and a healthy control group were analysed. Reliability and measurement error were calculated using two repeated measures from three independent raters. Construct validity was assessed by hypothesis testing, and known groups validity and responsiveness were defined by differences between groups.

Results

The data demonstrate excellent inter-rater (ICC = 0.81–1.00) and intra-rater (ICC = 0.85–1.00) reliability with low measurement error. Of the eight construct validity hypothesis, six were fully and two partially supported. Between-group differences were significant (P < 0.05) supporting the validity and responsiveness hypothesis.

Conclusion

2D TIP is a simple and inexpensive instrument for assessing landing strategy that has demonstrated appropriate reliability, validity and responsiveness in the ACL-injured population. The instrument will now be used to identify altered movement strategies and develop novel rehabilitation interventions that target strategy and performance.

Level of evidence

Prospective diagnostic study, Level II.

Keywords

Knee ACL Clinical biomechanics Movement analysis Rehabilitation Physiotherapy 

Notes

Acknowledgments

The project received funding from a Research Capacity Building Collaboration Wales PhD Fellowship.

Conflict of interest

The authors listed on this manuscript have no affiliations with or involvement in any organisation or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership or other equity interest; and expert testimony or patent-licensing arrangements) or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in this manuscript.

Ethical standards and institutional review board

Informed consent was obtained from each subject, and the rights of the subjects were protected in accordance with the 1964 Declaration of Helsinki and the favourable ethical opinion provided by the South East Wales Research Ethics Committee (Reg: 10/WSE04/48).

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Copyright information

© European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA) 2014

Authors and Affiliations

  • Robert Letchford
    • 1
    • 3
  • Kate Button
    • 1
    • 2
    • 4
  • Paul Adamson
    • 1
    • 2
    • 4
  • Paulien E. Roos
    • 1
    • 2
  • Valerie Sparkes
    • 1
    • 2
  • Robert W. M. van Deursen
    • 1
    • 2
  1. 1.School of Healthcare SciencesCardiff UniversityCardiffUK
  2. 2.Arthritis Research UK Biomechanics and Bioengineering CentreCardiff UniversityCardiffUK
  3. 3.Aneurin Bevan Health Board, Physiotherapy DepartmentRoyal Gwent HospitalNewport, GwentUK
  4. 4.Cardiff and Vale University Health Board, Physiotherapy DepartmentUniversity Hospital of WalesCardiffUK

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