Knee: Axial instability

Henry D. Clarke, W. Norman Scott

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


The results of TKA are among the best outcomes following any orthopedic procedure. Failures do occur, however, and tend to fall into recognizable patterns. Varus-valgus instability and anterior-posterior instability in flexion are common modes of failure. Failure to achieve symmetric medial-lateral soft tissue balance and symmetric flexion and extension spaces intraoperatively likely account for most of these cases. In primary TKA, the use of well-designed, posterior-stabilized prostheses that are implanted in strict accordance with the principles reviewed in this article should help prevent instability from occurring, particularly in the anterior-posterior plane in flexion. If instability occurs, revision surgery using the same basic principles to correct the imbalances is successful in most cases.

Original languageEnglish (US)
Pages (from-to)627-637
Number of pages11
JournalOrthopedic Clinics of North America
Issue number4
StatePublished - Jan 1 2001

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine


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