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No impact of severe varus deformity on clinical outcome after posterior stabilized total knee arthroplasty

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

An Erratum to this article was published on 11 January 2011

Abstract

Purpose

Severe varus deformity may lead to premature failure of total knee arthroplasties (TKAs) because of technical difficulties associated with satisfactory alignment and good ligament balance. The aim of the study was to assess whether preoperative varus severity would affect the longevity, clinical outcomes, and complication rates of TKAs.

Methods

From a prospectively collected database, we assessed outcomes in 168 knees that underwent primary TKAs using a single posterior stabilized design. These included 86 knees with mild preoperative deformity (varus mechanical tibiofemoral angle ≤5°) and 82 knees with severe preoperative deformity (varus angle ≥15°). Survivorship was analyzed by a life-table method. Clinical outcomes were also compared, including Knee Society knee and functional scores and complication rates.

Results

The postoperative tibiofemoral angle of the mild varus group was 7.1° ± 2.5°, whereas that of the severe varus group was 6.4° ± 2.5° (n.s.). There were no significant differences in terms of perioperative complications. Both groups showed the same cumulative survival rate, with absence of mechanical failure, of 98% at 7 years without difference (n.s.). There were no significant between-group differences of clinical parameters throughout the each follow-up period.

Conclusion

The knees with preoperative severe varus deformity were achieved the results comparable to those in knees with mild varus deformity, as determined by survival rate and clinical results. These data suggest that preoperative severe varus deformities can be successfully managed and do not have any detrimental effect on the longevity and clinical outcomes after a modern posterior stabilized TKA.

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Acknowledgments

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2010-0001733).

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Correspondence to Seong-Il Bin.

Additional information

An erratum to this article can be found at http://dx.doi.org/10.1007/s00167-010-1363-2

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Lee, BS., Lee, SJ., Kim, JM. et al. No impact of severe varus deformity on clinical outcome after posterior stabilized total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 19, 960–966 (2011). https://doi.org/10.1007/s00167-010-1316-9

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  • DOI: https://doi.org/10.1007/s00167-010-1316-9

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