Anteroposterior Knee Stability During Stair Descent

Kyle A. Borque, Jonathan E. Gold, Stephen J. Incavo, Rupal M. Patel, Sabir E. Ismaily, Philip C. Noble

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


This study examined the influence of tibio-femoral conformity on anteroposterior (AP) knee stability during stair descent, particularly with a dished cruciate sacrificing (CS) design. A joint simulator simulated stair descent of cadaveric knees. Tibio-femoral displacement was measured. Knees were tested in intact, ACL-deficient, and TKA with cruciate-retaining (CR), CS and posterior-stabilizing (PS) inserts. Loading during stair descent simulation caused femur displacement anteriorly prior to quadriceps contraction. Quadriceps contraction reestablished the initial femoral AP position. During simulated stair descent, AP stability was restored using PS, CR or CS inserts with an intact PCL. The CS design without the PCL did not provide AP stability. Increasing quadriceps force to restore AP stability may explain the clinical findings of pain and fatigue experienced by some patients after TKA.

Original languageEnglish (US)
Pages (from-to)1068-1072
Number of pages5
JournalJournal of Arthroplasty
Issue number6
StatePublished - Jun 1 2015


  • Anteroposterior knee stability
  • Cruciate-retaining inserts
  • Cruciate-sacrificing inserts
  • Posterior-stabilizing tibial inserts
  • Total knee arthroplasty

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine


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