The Journal of Bone and Joint Surgery. British volumeVol. 80-B, No. 1 ResearchFree AccessSimultaneous measurements of sagittal knee laxity with an external device and radiostereometric analysisL. P. Jorn, T. Fridén, L. Ryd, A. LindstrandL. P. JornSenior Registrar in Orthopaedic SurgeryLund University Hospital, S-221 85 Lund, Sweden.Search for more papers by this author, T. FridénAssociate Professor, Orthopaedic SurgeonLund University Hospital, S-221 85 Lund, Sweden.Search for more papers by this author, L. RydAssociate Professor, Orthopaedic SurgeonLund University Hospital, S-221 85 Lund, Sweden.Search for more papers by this author, A. LindstrandAssociate Professor, Orthopaedic SurgeonLund University Hospital, S-221 85 Lund, Sweden.Search for more papers by this authorPublished Online:1 Jan 1998https://doi.org/10.1302/0301-620X.80B1.0800169AboutSectionsPDF/EPUB ToolsAdd to FavouritesDownload CitationsTrack CitationsPermissions ShareShare onFacebookTwitterLinked InRedditEmail AbstractWe obtained simultaneous measurements of sagittal knee laxity in 12 consecutive patients after reconstruction of the anterior cruciate ligament (ACL), using the Stryker laxity tester and radiostereometric analysis (RSA).The mean anteroposterior (AP) displacement when a 90 N load was applied in both directions was 5.3 ± 2.7 mm with RSA and 9.8 ± 1.6 mm with the external device (p < 0.001). The corresponding measurements at a load of 180 N were 5.7 ± 2.4 mm and 13.8 ± 3.7 mm, respectively (p < 0.001).More than 50% of the sagittal knee movement, as measured by the external device at a load of 180 N, was not true femorotibial displacement of the joint but was due to soft-tissue deformation.FiguresReferencesRelatedDetailsCited ByReliability and Validity of an Innovative Device for ACL Testing: The Mobil-Aider™Journal of Sport Rehabilitation, Vol. 29, No. 2The Laxity of the Native KneeJournal of Bone and Joint Surgery, Vol. 101, No. 12Roentgen Stereophotogrammetric Analysis Methods for Determining Ten Causes of Lengthening of a Soft-Tissue Anterior Cruciate Ligament Graft Construct16 May 2008 | Journal of Biomechanical Engineering, Vol. 130, No. 4Fluoroscopic validation of electrogoniometrically measured femorotibial translation in healthy and ACL deficient subjectsScandinavian Journal of Medicine and Science in Sports, Vol. 12, No. 4 Vol. 80-B, No. 1 Metrics History Published online 1 January 1998 Published in print 1 January 1998 InformationCopyright © 1998, The British Editorial Society of Bone and Joint Surgery: All rights reservedPDF download