Knee Surgery, Sports Traumatology, Arthroscopy

, Volume 23, Issue 10, pp 3062–3069 | Cite as

The necessity of clinical application of tibial reduction for detection of underestimated posterolateral rotatory instability in combined posterior cruciate ligament and posterolateral corner deficient knee

  • Han-Jun Lee
  • Yong-Beom Park
  • Young-Bong Ko
  • Seong-Hwan Kim
  • Hyeok-Bin Kwon
  • Dong-Seok Yu
  • Young-Bok Jung



The purpose of this study was to evaluate the usefulness of tibial reduction during dial test for clinical detection of underestimated posterolateral rotatory instability (PLRI) in combined posterior cruciate ligament (PCL)–posterolateral corner (PLC) deficient knee in terms of external rotation laxity and clinical outcomes.


Twenty-one patients who classified as grade I PLRI using dial test with subluxated tibia, but classified as grade II with tibial reduction evaluated retrospectively. The mean follow-up was 39.3 months (range 24–61 months). Each patient was evaluated by the following variables: posterior translation and varus laxity on radiograph, KT-1000 arthrometer, dial test (reduced and subluxated position), International Knee Documentation Committee, Orthopädische Arbeitsgruppe Knie scoring system and Tegner activity scale.


There were significant improvements in posterior tibial translation (8.6 ± 2.0 to 2.1 ± 1.0 mm; P < 0.001), varus laxity (3.3 ± 1.3 to 1.4 ± 0.5 mm; P < 0.001) and external rotation (13.2° ± 0.8° to 3.6° ± 1.1° at 30°, 13.3° ± 0.9° to 3.6° ± 0.9° at 90°; P < 0.001). The clinical scores were improved significantly at the last follow-up (P < 0.001). The external tibial rotation during dial test with tibial reduction increased from 6.8° ± 0.9 to 13.2° ± 0.8° at 30° of knee flexion, from 7.0° ± 0.8° to 13.3° ± 0.9° at 90° (P < 0.001).


The clinical application of reduction of posteriorly subluxated tibia during the dial test was essential for an appropriate treatment of underestimated PLRI in combined PCL–PLC deficient knee.

Level of evidence

Retrospective case series, Level IV.


Posterior cruciate ligament Posterolateral rotator instability Dial test Tibial reduction 


Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Han-Jun Lee
    • 1
  • Yong-Beom Park
    • 2
  • Young-Bong Ko
    • 1
  • Seong-Hwan Kim
    • 1
  • Hyeok-Bin Kwon
    • 1
  • Dong-Seok Yu
    • 3
  • Young-Bok Jung
    • 4
  1. 1.Department of Orthopaedic SurgeryChung-Ang University School of MedicineSeoulKorea
  2. 2.Department of Orthopedic Surgery, Samsung Medical CenterSungkyunkwan University School of MedicineSeoulKorea
  3. 3.Department of Orthopaedic SurgeryGuro TnTn HospitalSeoulKorea
  4. 4.Department of Orthopaedic SurgeryHyundae General HospitalNamyangju-siKorea

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