Jump to content

International Knee Documentation Committee (IKDC) Subjective Knee Evaluation Form

Original Editor - Carina Therese Magtibay

Top Contributors - Carina Therese Magtibay  

Introduction

The International Knee Documentation Committee (IKDC) was formed in 1987 to create a standardized international system for documenting and evaluating knee problems. The IKDC Subjective Knee Form is a patient-reported outcome measure that was developed to assess both surgical and non-surgical outcomes across a wide range of knee conditions and treatment approaches.

Objective

To assess changes in symptoms, sports activities and function among people with different knee conditions such as ligamentous and meniscal injuries, osteoarthritis, and patellofemoral dysfunction. [1][2]

Intended Population

People with various knee disorders

  • Adults (18-65 years old) [2]
  • A modified version of IKDC (pedi-IKDC) has also been developed for paediatric population use (10-18 years old) [3]

Method of Use

The IKDC Subjective Knee Form is a self-reported questionnaire that is completed by the patient either on paper or online, typically taking less than 10 minutes.

Scoring

This knee-specific outcome measure is divided into three main sections: symptoms, sports activities, and function, comprising a total of 18 items. Each item is scored using an ordinal scale, wherein a higher score indicates better function or fewer symptoms. Some items are reverse-scored, so a score of 0 does not always represent the worst condition.

To calculate the total IKDC score, sum all item scores, excluding item 10a ("Function Prior to Knee Injury"). The maximum possible total is 87. To convert this to a 0–100 scale, divide the sum by 87 and multiply the result by 100.[4]

The IKDC score can only be calculated if at least 90% of the items are completed—that is, a minimum of 16 out of the 18 items must be answered.

Evidence

IKDC

Reliability: The IKDC shows good reliability as evidenced by high internal consistency (coefficient alpha = 0.92) and excellent test-retest reliability (ICC = 0.94).[4]

Validity: Based on a psychometric validation study in 2001, The IKDC Subjective Knee Form demonstrates high construct, convergent, and discriminant validity.[4]

Responsiveness:

  • According to a cohort study by Irrgang et al (2006), IKDC's responsiveness is proven by its large standardized response mean of 0.94 and an effect size of 1.13, demonstrating its ability to detect significant patient improvement over time.[5]
  • In a meta-analysis by Shephard et al (2023) of 257 studies, involving over 18,000 patients, it was found that IKDC is the most responsive patient reported outcome measure after meniscal surgery. It demonstrated large positive effect size of 1.94 and 0% floor and ceiling effects. [6]

Pedi-IKDC

Reliability: The Pedi-IKDC demonstrates strong reliability, with a high test-retest reliability (ICC = 0.91) and excellent internal consistency (Cronbach’s alpha = 0.91)[3]

Validity: The Pedi-IKDC shows good validity, with strong correlations (significant at P < .01) to nine related areas of the Child Health Questionnaire. Its construct validity was also strong, with all 11 tested predictions showing highly significant results (P < .0001).[3]

Responsiveness: The Pedi-IKDC shows excellent responsiveness to change with an effect size of 1.39 and a standardized response mean of 1.35.[3]

Links

American Orthopaedic Society for Sports Medicine (AOSSM) IKDC Knee Forms

References

  1. ↑ Hefti F, Müller W, Jakob RP, Stäubli HU. Evaluation of knee ligament injuries with the IKDC form. Knee Surgery, Sports Traumatology, Arthroscopy. 1993 Sep;1(3-4):226-34.
  2. ↑ 2.0 2.1 Anderson AF, Irrgang JJ, Kocher MS, Mann BJ, Harrast JJ, International Knee Documentation Committee. The International Knee Documentation Committee subjective knee evaluation form: normative data. The American journal of sports medicine. 2006 Jan;34(1):128-35.
  3. ↑ 3.0 3.1 3.2 3.3 Kocher MS, Smith JT, Iversen MD, Brustowicz K, Ogunwole O, Andersen J, Yoo WJ, McFeely ED, Anderson AF, Zurakowski D. Reliability, validity, and responsiveness of a modified International Knee Documentation Committee Subjective Knee Form (Pedi-IKDC) in children with knee disorders. The American journal of sports medicine. 2011 May;39(5):933-9.
  4. ↑ 4.0 4.1 4.2 Irrgang JJ, Anderson AF, Boland AL, Harner CD, Kurosaka M, Neyret P, Richmond JC, Shelborne KD. Development and validation of the international knee documentation committee subjective knee form. The American journal of sports medicine. 2001 Sep;29(5):600-13.
  5. ↑ Irrgang JJ, Anderson AF, Boland AL, Harner CD, Neyret P, Richmond JC, Shelbourne KD, International Knee Documentation Committee. Responsiveness of the international knee documentation committee subjective knee form. The American journal of sports medicine. 2006 Oct;34(10):1567-73.
  6. ↑ Shephard L, Abed V, Nichols M, Kennedy A, Khalily C, Conley C, Jacobs C, Stone AV. International Knee Documentation Committee (IKDC) is the most responsive patient reported outcome measure after meniscal surgery. Arthroscopy, Sports Medicine, and Rehabilitation. 2023 Jun 1;5(3):e859-65.
Retrieved from "https://www.physio-pedia.com/w/index.php?title=International_Knee_Documentation_Committee_(IKDC)_Subjective_Knee_Evaluation_Form&oldid=370678"