2017 ISAKOS Biennial Congress ePoster #1154


Quantification Of The Lachman Test: Kira And Kt 1000

Cecilia Signorelli, PhD, Bologna, BO ITALY
Stefano Zaffagnini, MD, Prof., Bologna ITALY
Federico Raggi, MD, Bologna ITALY
Giulio Maria Marcheggiani Muccioli, MD, PhD, Associate Professor, Bologna ITALY
Alberto Grassi, PhD, Bologna ITALY
Han Yue, Eng, Bologna ITALY
Tommaso Roberti di Sarsina, MD, Bologna ITALY
Tommaso Bonanzinga, MD, PhD, Rozzano, milano ITALY
Maurilio Marcacci, MD, Milano, Milano ITALY

Istituto Ortopedico Rizzoli, Bologna, BO, ITALY

FDA Status Not Applicable


To define in-vivo the correlation between the laxity values obtained using the non invasive device KiRA and the values indicated by KT1000 during the Lachman test. Twenty-two patients and three different operators were included in the study.

ePosters will be available shortly before Congress



The purpose of this in vivo study is to determine the correlation between the laxity values obtained using the innovative non invasive system KiRA (Orthokey, USA) and the values indicated by KT1000 during the Lachman test.


Twenty-two patients underwent the Lachman test (manual-maximum), by two different operators (OP1 and OP2) at 20-years of follow up after ACL reconstruction. For each patient were recorded data both on the operated knee and the contralateral with KiRA device as well as KT1000. In addition, twenty-three patients were tested preoperatively by a third operator (OP3). Subsequently it was examined:
1) the correlation between the two operators OP1 and OP2 concerning the KiRA data in the joints affected by ACL reconstruction;
2) the correlation between the KiRA and KT1000 data for both the operator OP1 OP2;
3) the correlation between the data of Kira and KT1000 considering contralateral joints of patients tested by OP3 and joints affected by ACL reconstruction and tested by OP1 and OP2.
For the analysis were used the Pearson coefficient (r), and when the assumptions of parametric correlation model were not fulfilled, the coefficient of Spearman (rs). The significance was set at 0.05.


The correlation values so obtained were found to be:
1) r = 0.7 between KiRA data acquired by OP1 and OP2 in the reconstructed joints;
2) rs = 0.6 and 0.8, respectively for the reconstructed knees and healthy dell 'OP1 and similarly rs = 0.8 and 0.6 for OP2;
3) rs = 0.4 considering the data acquired on the joints against side considering the operator OP1 and OP3 and rs = 0.5 considering the data acquired from OP3 and OP2.


With the inter-operator analysis on the data acquired with KiRA (Orthokey, USA), it has found a good correlation between the data of OP1 and OP2. Even the comparisons performed on the contralateral and reconstructed joints showed a good / excellent correlation between the two devices.
In conclusion, the innovative device KiRA (Orthokey, USA) represents a valid option for a non-invasive, easy to use and comfortable quantification of Lachman test.