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Journal of Bone and Joint Surgery - British Volume, Vol 89-B, Issue 11, 1457-1461.
doi: 10.1302/0301-620X.89B11.19840  
Copyright © 2007 by British Editorial Society of Bone and Joint Surgery
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High incidence of loosening of the femoral component in legacy posterior stabilised-flex total knee replacement

H. S. Han, MD, Clinical Professor1; S.-B. Kang, MD, PhD, Associate Professor1; and K. S. Yoon, MD, PhD, Associate Professor1

1 Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul Metropolitan Boramae Hospital, 31-1 Boramae-gil, Dongjak-gu, 156-707 Seoul, Korea.

Correspondence should be sent to Professor S.-B. Kang; e-mail: ossbkang{at}gmail.com

We have examined the results obtained with 72 NexGen legacy posterior stabilised-flex fixed total knee replacements in 47 patients implanted by a single surgeon between March 2003 and September 2004.

Aseptic loosening of the femoral component was found in 27 (38%) of the replacements at a mean follow-up of 32 months (30 to 48) and 15 knees (21%) required revision at a mean of 23 months (11 to 45). We compared the radiologically-loose and revised knees with those which had remained well-fixed to identify the factors which had contributed to this high rate of aseptic loosening.

Post-operatively, the mean maximum flexion was 136° (110° to 140°) in the loosened group and 125° (95° to 140°) in the well-fixed group (independent t-test, p = 0.022). Squatting, kneeling, or sitting cross-legged could be achieved by 23 (85%) of the loosened knees, but only 22 (49%) of the well-fixed knees (chi-squared test, p = 0.001). The loosened femoral components were found to migrate into a more flexed position, but no migration was detected in the well-fixed group.

These implants allowed a high degree of flexion, but showed a marked rate of early loosening of the femoral component, which was associated with weight-bearing in maximum flexion.




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Home page
 J Bone Joint Surg BrHome page
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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Successful results with a high flexion posterior stabilised knee prosthesis
Giles R. Scuderi
J Bone Joint Surg Br Online, 21 Dec 2007 [Full text]

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