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Hindsight Biases

Hindsight bias leads you to believe that the event you just experienced was predictable, even though it really wasn’t. In other words, you knew all along that things would turn out the way they did. Can you relate this to the phrase "Hindsight is 20/20" now?
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Impression Management Techniques III: Aligning Actions

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Mismatch Repair01:20

Mismatch Repair

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The Anchoring-and-Adjustment Heuristic01:25

The Anchoring-and-Adjustment Heuristic

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Related Experiment Videos

Malalignment: forewarned is forearmed.

David Fang1, Merrill A Ritter

  • 1Department of Orthopedics, Indiana University School of Medicine, Indianapolis, Indiana, USA.

Orthopedics
|September 16, 2009
PubMed
Summary
This summary is machine-generated.

Achieving optimal coronal alignment in total knee arthroplasty (TKA) is crucial for implant survival. Maintaining alignment between 2.4 and 7.2 degrees of valgus significantly reduces revision rates.

Related Experiment Videos

Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Radiology

Background:

  • Malalignment in total knee arthroplasty (TKA) is a significant predictor of implant failure.
  • Understanding the acceptable range for coronal alignment is critical for successful TKA outcomes.

Purpose of the Study:

  • To evaluate the relationship between postoperative coronal alignment and revision rates in a large cohort of primary TKAs.
  • To determine the optimal alignment window for minimizing TKA failure.

Main Methods:

  • Analysis of standard-length knee radiographs from 6070 primary TKAs to assess anatomical coronal alignment.
  • Statistical comparison of revision rates across different alignment ranges (varus, neutral, valgus).
  • Kaplan-Meier survival analysis to confirm long-term outcomes.

Main Results:

  • The mean postoperative alignment was 4.8 degrees of valgus, with a favorable revision rate of 0.5% within 1 standard deviation (2.4-7.2 degrees valgus).
  • TKAs aligned in relative varus (<2.4 degrees valgus) showed a significantly higher failure rate (1.8%, P=.0004).
  • TKAs aligned in excessive valgus (>7.2 degrees valgus) also demonstrated increased failure rates (1.5%, P=.0027).
  • Varus alignment led to medial tibial collapse, while valgus alignment resulted in ligamentous laxity.

Conclusions:

  • Restoring coronal alignment between 2.4 and 7.2 degrees of anatomical valgus is the most critical surgeon-controlled factor for TKA success.
  • Deviations from this optimal alignment window significantly increase the risk of TKA revision.
  • Specific failure modes are associated with varus (medial tibial collapse) and valgus (ligamentous laxity) malalignment.