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FMPI-SF

Feline Musculoskeletal Pain Index, Short Form (FMPI-SF)

Owner-completed 9-item musculoskeletal pain index for cats, refined from the original 17-item FMPI for shorter administration without losing validity.

Overview

Developer
Enomoto, Lascelles, Robertson, Gruen — NC State CPRC
Year published
2022
Species
Feline
Domain
Chronic musculoskeletal pain (degenerative joint disease)

Structure and administration

9 items, 5-point Likert (0-4), total range 0-36

Owner-completed, 2-3 minutes

Psychometric properties

Cronbach α
0.91

Cut-off and interpretation

Cut-off threshold
10

Source: Enomoto et al. 2022 emphasise change-from-baseline rather than a categorical cut-off. Sightline applies a four-band severity classification for member-facing interpretation: minimal 0-9, mild 10-18, moderate 19-27, severe 28-36.

Citation and validation

Enomoto M, Lascelles BDX, Robertson JB, Gruen ME. Refinement of the Feline Musculoskeletal Pain Index (FMPI) and development of the short-form FMPI. J Feline Med Surg 2022;24:142-151.

DOI: 10.1177/1098612X211011984

Revisions

  • Original FMPI (Benito et al. 2013) — 17-item parent instrument validated for cats with degenerative joint disease.
  • Short-form FMPI-SF (Enomoto, Lascelles, Robertson, Gruen 2022) — refined to 9 items via Rasch analysis. Cronbach α 0.91 across the validated cohort, item-fit statistics confirmed within accepted bounds.

Target population

Adult cats with degenerative joint disease or other chronic musculoskeletal pain. Specifically validated for change tracking in DJD-related pain; not validated for acute pain or non-musculoskeletal chronic conditions.

Available languages

English (UK)

Licence

Free for research and clinical use with citation (NC State CPRC).

Scoring algorithm version

sightline-fmpi-sf-v1.0.0

Strengths

  • Short administration (2-3 minutes) keeps fortnightly tracking realistic for cat owners, who often find longer questionnaires intrusive.
  • Refined from a longer parent instrument via Rasch analysis, so the 9 items are the most informative subset, not an arbitrary trim.
  • Cronbach α 0.91 across the validation cohort; designed for repeat administration to detect change over time.
  • Free for research and clinical use with citation, no per-deployment licence fee.

Limitations

  • Validated only in cats and primarily for DJD-related musculoskeletal pain.
  • Single composite score, no subscale breakdown to localise affected joints or activity domains.
  • Sensitivity to subtle change is harder to interpret in cats than in dogs because cats reduce activity rather than vocalise; owner observation across days helps.
  • Phase 1 ships English (UK); the published instrument has been validated in US English. Founder review is on file before public launch.

Why Sightline uses it

FMPI-SF is the shortest validated owner-administered musculoskeletal pain instrument for cats, with Cronbach α 0.91 in the original Rasch refinement. The 9 items keep fortnightly tracking realistic, which matters more than depth of any single check-in. Free deployment under citation keeps the methodology page accurate and the platform unencumbered by per-use licensing fees, and the short form fits the way cat owners actually engage with assessments.