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Journal of Bone and Joint Surgery - British Volume, Vol 90-B, Issue 1, 37-42.
doi: 10.1302/0301-620X.90B1.19702  
Copyright © 2008 by British Editorial Society of Bone and Joint Surgery
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A prospective randomised double-blind study of functional outcome and range of flexion following total knee replacement with the NexGen standard and high flexion components

R. W. Nutton, MD, FRCS, Consultant Orthopaedic Surgeon1; M. L. van der Linden, MSc, PhD, Research Fellow2; P. J. Rowe, PhD, BSc(Hons), Professor3; P. Gaston, MBChB, FRCS, Consultant Orthopaedic Surgeon1; and F. A. Wade, FRCS, Consultant Orthopaedic Surgeon1

1 Arthroplasty Service, Royal Infirmary of Edinburgh, Little France, Edinburgh EH16, 4SU, UK.
2 School of Health Sciences, Queen Margaret University, Queen Margaret University, Drive, Musselburgh EH21 6UU, UK.
3 HealthQWest Bioengineering Unit, University of Strathclyde, Wolfson Centre, 106 Rotten Row, Glasgow G4 0NW, UK.

Correspondence should be sent to Mr R. W. Nutton; e-mail: richard.nutton{at}luht.scot.nhs.uk

Modifications in the design of knee replacements have been proposed in order to maximise flexion. We performed a prospective double-blind randomised controlled trial to compare the functional outcome, including maximum knee flexion, in patients receiving either a standard or a high flexion version of the NexGen legacy posterior stabilised total knee replacement. A total of 56 patients, half of whom received each design, were assessed pre-operatively and at one year after operation using knee scores and analysis of range of movement using electrogoniometry. For both implant designs there was a significant improvement in the function component of the knee scores (p < 0.001) and the maximum range of flexion when walking on the level, ascending and descending a slope or stairs (all p < 0.001), squatting (p = 0.020) and stepping into a bath (p = 0.024). There was no significant difference in outcome, including the maximum knee flexion, between patients receiving the standard and high flexion designs of this implant.




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T.-H. Kim, D.-H. Lee, and S.-I. Bin
The NexGen LPS-flex to the knee prosthesis at a minimum of three years
J Bone Joint Surg Br, October 1, 2008; 90-B(10): 1304 - 1310.
[Abstract] [Full Text] [PDF]

eLetters:

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Total knee replacement with the NexGen standard
Peter C. Weber
J Bone Joint Surg Br Online, 15 Feb 2008 [Full text]

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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General