The effect of post-operative mechanical axis alignment on the survival of primary total knee replacements after a follow-up of 15 years

T. J. Bonner; W. G. P. Eardley; P. Patterson; P. J. Gregg

doi:10.1302/0301-620X.93B9.26573

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The effect of post-operative mechanical axis alignment on the survival of primary total knee replacements after a follow-up of 15 years

T. J. Bonner
W. G. P. Eardley
P. Patterson
P. J. Gregg

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The effect of post-operative mechanical axis alignment on the survival of primary total knee replacements after a follow-up of 15 years

Bonner TJ, Eardley WGP, Patterson P, Gregg PJ. The effect of post-operative mechanical axis alignment on the survival of primary total knee replacements after a follow-up of 15 years. J Bone Joint Surg Br. 2011;93-B(9):1217-1222. doi:10.1302/0301-620X.93B9.26573

Bonner, T. J., et al. “The effect of post-operative mechanical axis alignment on the survival of primary total knee replacements after a follow-up of 15 years.” The Journal of Bone & Joint Surgery British Volume, vol. 93-B, no. 9, 2011, pp. 1217-1222., https://doi.org/10.1302/0301-620X.93B9.26573

Bonner, T. J., Eardley, W. G. P., Patterson, P., & Gregg, P. J. (2011). The effect of post-operative mechanical axis alignment on the survival of primary total knee replacements after a follow-up of 15 years. The Journal of Bone & Joint Surgery British Volume, 93-B(9), 1217-1222. https://doi.org/10.1302/0301-620X.93B9.26573

Bonner, T. J., Eardley, W. G. P., Patterson, P. and Gregg, P. J. (2011) “The effect of post-operative mechanical axis alignment on the survival of primary total knee replacements after a follow-up of 15 years.” The Journal of Bone & Joint Surgery British Volume, 93-B(9), pp. 1217-1222. Available at: https://doi.org/10.1302/0301-620X.93B9.26573

Bonner, T. J., W. G. P. Eardley, P. Patterson, and P. J. Gregg. “The effect of post-operative mechanical axis alignment on the survival of primary total knee replacements after a follow-up of 15 years.” The Journal of Bone & Joint Surgery British Volume 93-B, no. 9 (2011): 1217-1222. https://doi.org/10.1302/0301-620X.93B9.26573

Bonner TJ, Eardley WGP, Patterson P, Gregg PJ. The effect of post-operative mechanical axis alignment on the survival of primary total knee replacements after a follow-up of 15 years. J Bone Joint Surg Br. 2011 Sep 1;93-B(9):1217-1222. https://doi.org/10.1302/0301-620X.93B9.26573

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Abstract

Correct positioning and alignment of components during primary total knee replacement (TKR) is widely accepted to be an important predictor of patient satisfaction and implant durability. This retrospective study reports the effect of the post-operative mechanical axis of the lower limb in the coronal plane on implant survival following primary TKR.

A total of 501 TKRs in 396 patients were divided into an aligned group with a neutral mechanical axis (± 3°) and a malaligned group where the mechanical axis deviated from neutral by > 3°. At 15 years’ follow-up, 33 of 458 (7.2%) TKRs were revised for aseptic loosening. Kaplan-Meier survival analysis showed a weak tendency towards improved survival with restoration of a neutral mechanical axis, but this did not reach statistical significance (p = 0.47).

We found that the relationship between survival of a primary TKR and mechanical axis alignment is weaker than that described in a number of previous reports.

Correspondence should be sent to Mr T. J. Bonner; e-mail: t.bonner10@imperial.ac.uk

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