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The Bone & Joint Journal
Vol. 97-B, Issue 5 | Pages 642 - 648
1 May 2015
Hunt NC Ghosh KM Blain AP Rushton SP Longstaff LM Deehan DJ

The aim of this study was to compare the maximum laxity conferred by the cruciate-retaining (CR) and posterior-stabilised (PS) Triathlon single-radius total knee arthroplasty (TKA) for anterior drawer, varus–valgus opening and rotation in eight cadaver knees through a defined arc of flexion (0º to 110º). The null hypothesis was that the limits of laxity of CR- and PS-TKAs are not significantly different.

The investigation was undertaken in eight loaded cadaver knees undergoing subjective stress testing using a measurement rig. Firstly the native knee was tested prior to preparation for CR-TKA and subsequently for PS-TKA implantation. Surgical navigation was used to track maximal displacements/rotations at 0º, 30º, 60º, 90º and 110° of flexion. Mixed-effects modelling was used to define the behaviour of the TKAs.

The laxity measured for the CR- and PS-TKAs revealed no statistically significant differences over the studied flexion arc for the two versions of TKA. Compared with the native knee both TKAs exhibited slightly increased anterior drawer and decreased varus-valgus and internal-external roational laxities. We believe further study is required to define the clinical states for which the additional constraint offered by a PS-TKA implant may be beneficial.

Cite this article: Bone Joint J 2015; 97-B:642–8.


Orthopaedic Proceedings
Vol. 85-B, Issue SUPP_II | Pages 107 - 107
1 Feb 2003
Longstaff LM Milner RH O’Sullivan S Fawcett P
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The aim of this retrospective study was to investigate in patients with carpal tunnel syndrome the relationship between pre-operative symptoms, electrophysiological testing and outcome after surgery.

62 patients who had undergone carpal tunnel surgery were assessed in clinic, their case notes were reviewed and the electrophysiological results were analysed and graded according to severity.

The median duration of symptoms was 2 years. No relationship was found between the duration of pre-operative symptoms and the severity of electrophysio-logical impairment.

Furthermore, no relationship could be identified between electrophysiological impairment and either successful outcome after surgery (defined as complete symptom resolution) or time to resolution of symptoms after surgery