Olerud-Molander Ankle Score

Original Editor - Carina Therese Magtibay

Top Contributors - Carina Therese Magtibay and Uchechukwu Chukwuemeka  

Objective[edit | edit source]

The Olerud-Molander Ankle Score (OMAS) is a self-reported outcome measure that assesses the symptoms and function of a patient following an ankle fracture. This scoring system was developed by Olerud and Molander in 1984 as a fast, easy and objective way to determine the impact of ankle fracture on the patient's current status.[1]

Intended Population[edit | edit source]

Individuals who have had an ankle fracture.

Method of Use[edit | edit source]

OMAS uses a summated rating scale format and consists of 9 questions:

  1. pain (0 to 25)
  2. stiffness (0 to 10)
  3. swelling (0 to 10)
  4. stair climbing (0 to 10)
  5. running (0 to 5)
  6. jumping (0 to 5)
  7. squatting (0 to 5)
  8. use of supports (0 to 10)
  9. work/activity level (0to20)

The highest possible score is 100 and higher scores indicate better outcomes

Evidence[edit | edit source]

Reliability[edit | edit source]

In a Swedish study of OMAS among people surgically treated after an ankle fracture, the following conclusions were made:[2]

  1. Test-retest reliability = very high
    • rho = 0.95
    • ICC = 0.94
  2. Standard error of measure = Low
    • SEM = 4.4 points
    • SEM% = 5.8%
  3. Internal consistency = 0.76

Validity[edit | edit source]

Concurrent validity using Foot and Ankle Outcome Score (FAOS) and Global Self-Rating Function (GSRF) = high[2]

  • correlation coefficients versus the five subscales of FAOS ranged from rho = 0.80 to 0.86.
  • There were significant differences between GSRF groups “good”, “fair” and “poor” (p < 0.001) at both the six-month and the 12-month follow-up.

Responsiveness[edit | edit source]

The effect size between results from 6-month and 12-month follow-up = 0.4. This finding is considered as medium, suggesting that there was a noticeable difference in ankle function between the two time-points, but it was not extremely large.[2]

Links[edit | edit source]

Olerud-Molander Ankle Score Questionnaire

References[edit | edit source]

  1. Olerud C, Molander H. A scoring scale for symptom evaluation after ankle fracture. Archives of orthopaedic and traumatic surgery. 1984 Sep;103:190-4.
  2. 2.0 2.1 2.2 Nilsson GM, Eneroth M, Ekdahl CS. The Swedish version of OMAS is a reliable and valid outcome measure for patients with ankle fractures. BMC musculoskeletal disorders. 2013 Dec;14:1-8.