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. 2018 Jun 1;30(2):121-127.
doi: 10.5792/ksrr.17.014.

Diagnostic Tools for Acute Anterior Cruciate Ligament Injury: GNRB, Lachman Test, and Telos

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Free PMC article

Diagnostic Tools for Acute Anterior Cruciate Ligament Injury: GNRB, Lachman Test, and Telos

Seung Min Ryu et al. Knee Surg Relat Res. .
Free PMC article

Abstract

Purpose: The purpose of this study is to compare the accuracy of the GNRB arthrometer (Genourob), Lachman test, and Telos device (GmbH) in acute anterior cruciate ligament (ACL) injuries and to evaluate the accuracy of each diagnostic tool according to the length of time from injury to examination.

Materials and methods: From September 2015 to September 2016, 40 cases of complete ACL rupture were reviewed. We divided the time from injury to examination into three periods of 10 days each and analyzed the diagnostic tools according to the time frame.

Results: An analysis of the area under the curve (AUC) of a receiver operating characteristic curve showed that all diagnostic tools were fairly informative. The GNRB showed a higher AUC than other diagnostic tools. In 10 cases assessed within 10 days after injury, the GNRB showed statistically significant side-to-side difference in laxity (p<0.001), whereas the Telos test and Lachman test did not show significantly different laxity (p=0.541 and p=0.413, respectively).

Conclusions: All diagnostic values of the GNRB were better than other diagnostic tools in acute ACL injuries. The GNRB was more effective in acute ACL injuries examined within 10 days of injury. The GNRB arthrometer can be a useful diagnostic tool for acute ACL injuries.

Keywords: Anterior cruciate ligament; Diagnosis; GNRB Arthrometer; Injury; Knee; Telos.

Conflict of interest statement

Conflict of Interest

No potential conflict of interest relevant to this article was reported.

Figures

Fig. 1
Fig. 1
(A) Lachman test. A 23-year-old male was lying on a radiolucent table with the knee positioned in 30° of knee flexion and drawn anteriorly. (16 days after injury). (B) We conducted the Lachman test at the power of 80 N approximately.
Fig. 2
Fig. 2
(A) Telos (GmbH) device. A 19-year-old male was lying on a radiolucent table with the knee in 30° of flexion. The tibia was pressed anteriorly. We could measure the displaced distance by radiographic imaging. (20 days after injury) (B) GNRB arthrometer (Genourob). The 19-year-old male was lying on the GNRB arthrometer. The patient’s leg was fixed on the arthrometer at 30° of knee flexion. The patient’s tibia was pressed anteriorly and we could check the displaced distance.
Fig. 3
Fig. 3
Flow diagram of inclusion and exclusion of the study participants. ACL: anterior cruciate ligament, MRI: magnetic resonance imaging, MCL: medial collateral ligament.
Fig. 4
Fig. 4
The Lachman test and the Telos test were performed at 80 N with 30° knee flexion. The anterior laxity of the knee joint is measured by displacement of the midpoint between the tangents to the posterior contours of the tibial condyles drawn perpendicular to the tibial plateau and relative to the location of the corresponding midpoint between the 2 posterior aspects of the femoral condyles.
Fig. 5
Fig. 5
GNRB (Genourob) results graph. The GNRB test was performed continuously from 0 N to 134 N in both knees.

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