Anterior knee laxity measurement using stress radiographs and the GNRB® system versus intraoperative navigation - 20/09/13
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Summary |
Background |
Anterior knee laxity measurement serves both to diagnose and to evaluate the severity of anterior cruciate ligament (ACL) damage.
Hypothesis |
We tested the hypothesis that anterior laxity measurements of ACL-deficient knees obtained using the GNRB® system and stress radiographs differed from each other and from intraoperative navigation measurement taken as the reference standard.
Material and methods |
Twenty-one patients with chronic ACL deficiency underwent arthroscopic ACL reconstruction. Anterior knee laxity was measured preoperatively using the GNRB® system without anaesthesia and anterior-drawer stress radiographs under anaesthesia then intraoperatively using a non-image-based navigation system.
Results |
The three measurements differed significantly (P=0.05). A systematic measurement error of −3.7mm occurred for both preoperative measurements versus the reference standard. No significant difference was found between the two preoperative measurements.
Discussion |
The GNRB® system should be preferred over stress radiographs, as reliability is similar but no radiation exposure is required. Both preoperative measurement methods underestimate anterior laxity as measured intraoperatively using the navigation system. This systematic bias may be relevant to treatment decision-making.
Level of evidence |
II, development of a diagnostic criterion in consecutive patients versus a validated reference standard.
Le texte complet de cet article est disponible en PDF.Keywords : Anterior cruciate ligament, Laxity, Instrumented measurement, GNRB®, Navigation
Plan
Vol 99 - N° 6S
P. S297-S300 - octobre 2013 Retour au numéro
Article précédent
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