Knee Surgery, Sports Traumatology, Arthroscopy

, Volume 17, Issue 8, pp 920–926 | Cite as

Reliability testing of a new device to measure tibial rotation

  • Olaf LorbachEmail author
  • P. Wilmes
  • D. Theisen
  • M. Brockmeyer
  • S. Maas
  • D. Kohn
  • R. Seil


The purpose of this study was to evaluate the reliability of a new developed device to measure tibial rotation, the Rotameter. Thirty healthy subjects (15 males, 15 females, 24 years) were examined with the Rotameter measurement device. External and internal rotation was performed at an applied torque of 5, 10 and 15 Nm by two independent examiners in order to test the inter-observer reliability. The patients were measured again after a mean of 31 ± 43 days by the same examiners to test the intra-observer reliability. Statistical analysis was performed using the intra-class correlation coefficient. The Pearson Correlation coefficient was used to compare the measurements of the left with the right side of the participants. In the measurements, a high inter- and intra-observer reliability was found at 5, 10 and 15 Nm of applied torque for the external rotation, internal rotation and the rotational range (internal + external rotation). Comparison of the left and the right knee of the same participant also revealed high correlations in the Pearson correlation coefficient at all applied torques. In conclusion, the Rotameter testing device for the measurement of tibial rotation showed a high inter-observer and intra-observer reliability. It is easy to perform and might be used in a wide field as a non-invasive instrument to objectively determine rotational stability and to investigate the restoration of the rotational stability after surgical procedures.


Rotational stability Measurement device Knee laxity ACL Tibial rotation 



The authors like to thank all test persons who participated in the study and Dr. Thomas Georg for the statistical support.

Conflict of interest statement

No potential conflicts of interests are declared.


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Olaf Lorbach
    • 1
    • 2
    Email author
  • P. Wilmes
    • 1
    • 2
  • D. Theisen
    • 4
  • M. Brockmeyer
    • 1
  • S. Maas
    • 3
  • D. Kohn
    • 1
  • R. Seil
    • 2
  1. 1.Department of Orthopedic SurgerySaarland UniversityHomburg/SaarGermany
  2. 2.Service de Chirurgie Orthopédique et Traumatologique, Centre d’Orthopédie et de Médecine du SportCentre Hospitalier, Clinique d’EichLuxembourgLuxembourg
  3. 3.Unité ‘Ingénierie’, de la Technologie et de la Communication, Faculté des SciencesUniversité du LuxembourgLuxembourgLuxembourg
  4. 4.CRP-SantéCellule de Sport et de SantéLuxembourgLuxembourg

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