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Related Experiment Videos

The development of the Functional Capacity Index

E J MacKenzie1, A Damiano, T Miller

  • 1Center for Injury Research and Policy, Johns Hopkins School of Public Health, Baltimore, Maryland, USA.

The Journal of Trauma
|November 1, 1996
PubMed
Summary

The Functional Capacity Index (FCI) was developed to measure expected functional outcomes after injury. While further validation is needed, the FCI shows promise as an Abbreviated Injury Scale (AIS) based tool for assessing injury impact.

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Area of Science:

  • Traumatology and Rehabilitation Medicine
  • Biostatistics and Health Outcomes Research

Background:

  • The Abbreviated Injury Scale (AIS) is widely used but does not directly quantify functional capacity post-injury.
  • Existing scales like the Injury Impairment Scale (IIS) have limitations in reflecting long-term functional deficits.

Purpose of the Study:

  • To develop and validate the Functional Capacity Index (FCI) as a measure of expected functional capacity one year after injury.
  • To compare the FCI with the Abbreviated Injury Scale (AIS) and Injury Impairment Scale (IIS).

Main Methods:

  • The FCI was developed through expert consensus on functional dimensions and validated by correlating scores with patient-reported outcomes and clinical assessments.
  • A panel defined 10 functional dimensions and capacity levels.

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  • Clinical experts assigned FCI scores to AIS '90 injury descriptions.

    • Main Results:

    • The FCI demonstrated conceptual integrity, with most injuries receiving low or zero scores, indicating minimal expected long-term impairment.
    • In a cohort of 301 lower extremity fracture patients, FCI scores showed a modest correlation with observed impairment levels at one year.
    • The FCI appeared to offer better discrimination of functional levels compared to AIS and IIS.

    Conclusions:

    • The FCI represents a novel, AIS-based approach to quantifying expected functional outcomes after traumatic injuries.
    • Further empirical validation across diverse injury types and settings is recommended before widespread clinical adoption.