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Knee Surgery, Sports Traumatology, Arthroscopy

, Volume 23, Issue 9, pp 2727–2733 | Cite as

An analysis of normative data on the knee rotatory profile and the usefulness of the Rotatometer, a new instrument for measuring tibiofemoral rotation: the reliability of the knee Rotatometer

  • Ju Hwan Chung
  • Keun Jung Ryu
  • Dong Hoon Lee
  • Kyung Ho Yoon
  • Yang Woo Park
  • Hyung Jong Kim
  • Jae Hwa KimEmail author
Knee

Abstract

Purpose

This study proposes a simple and noninvasive instrument called the “Rotatometer” to measure tibiofemoral rotation and investigates its clinical applicability to the assessment of static rotational knee laxity.

Methods

The degree of tibiofemoral rotation was measured for a sample of 94 healthy volunteers with 188 knees by using the Rotatometer. The measurement was made by two independent and blinded examiners in three sessions at one-month intervals. The normative rotational profile and its relationship with gender and age were evaluated, and inter-observer reliability and intra-observer reliability were calculated.

Results

Males showed 62° ± 5° of external rotation, whereas females, 64° ± 5°. Males showed 44° ± 5° of internal rotation, whereas females, 49° ± 4°. Females showed significantly higher degrees of rotation than males. Tibiofemoral rotation was not correlated with age, and external rotation and internal rotation had a moderate positive relationship. Inter-observer reliability ranged from 0.84 to 0.91 for external rotation and 0.90 to 0.95 for internal rotation, and intra-observer reliability ranged from 0.69 to 0.89 for external rotation and 0.87 to 0.95 for internal rotation.

Conclusions

The results suggest the Rotatometer to be a simple and noninvasive device with high inter- and intra-observer reliability. The device can provide a normative rotational profile for reference purposes and thus can be used to determine the preoperative and postoperative rotational status of knees with anterior cruciate ligament injuries and compare results from different reconstruction techniques.

Level of evidence

Diagnostic study, Level III.

Keywords

Rotatory profile Tibiofemoral rotation Pivot shift Rotatory laxity Measurement device 

Notes

Acknowledgments

All authors have read and approved submission of the manuscript, and we have confirmed that all authors fulfilled conditions required for authorship. This manuscript has not been published and is not being considered for publication elsewhere in whole or in part in any language. This study was approved by the Institutional Review Board (IRB). No financial support was received.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Ju Hwan Chung
    • 1
  • Keun Jung Ryu
    • 1
  • Dong Hoon Lee
    • 3
  • Kyung Ho Yoon
    • 2
  • Yang Woo Park
    • 1
  • Hyung Jong Kim
    • 1
  • Jae Hwa Kim
    • 1
    Email author
  1. 1.Center for Joint Disease, Department of Orthopaedic Surgery, CHA Bundang Medical Center, School of MedicineCHA UniversitySungnam-siSouth Korea
  2. 2.Department of Orthopaedic Surgery, College of MedicineKyung Hee University Medical CenterSeoulSouth Korea
  3. 3.Department of Orthopaedic Surgery, Severance Hospital, College of Medicine,Yonsei UniversitySeoulSouth Korea

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