Subjective Knee Evaluation Form

International Knee Documentation Committee (IKDC)

International Knee Documentation Committee (IKDC)

International Knee Documentation Committee (IKDC) | Subjective Knee Evaluation Form

The IKDC is a purely subjective assessment that assigns patients a functional overall rating. Three (3) categories are examined by the questionnaire: symptoms, athletic activity, and knee function. The symptoms subscale aids in evaluating issues like pain, stiffness, edema, and knee giving way. The stair climbing, standing up from a chair, squatting, and jumping functions are the emphasis of the sports activity subscale. The knee function subscale asks patients one (1) straightforward question: How is their knee now compared to how it was before the injury?


Validity and Reliability

The ICC, which varies from 0.87 to 0.98, was deemed sufficient (>0.70). Overall, it was discovered that the IKDC-SKF has positive test-retest reliability (Grevnerts et al. 2015). The IKDC subjective form scored acceptable for construct validity (84% confirmation of the predefined hypotheses) and responsiveness (86% confirmation of the predefined hypotheses)  (van Meer et al. 2015).


Scoring and Interpretation

An ordinal scoring system is used to assign a score of 0 to responses that signify the lowest level of function or the highest level of symptoms for each item. The response “Unable to perform any of the above activities due to knee pain” receives a score of 0 while the response “Very strenuous activities like jumping or pivoting as in basketball or soccer” receives a score of 4. This is how item 1, which is related to the highest level of activity without significant pain, is scored. For item 2, which asks about the frequency of pain in the last four weeks, the responses “Constant” and “Never” receive scores of 0 and 10, respectively.

The IKDC Subjective Knee Evaluation Form is graded by adding the results of each item’s scores, and then converting the result to a scale from 0 to 100. Note: The answer to item 10a, “Function Before Knee Injury,” is not factored towards the final score.

IKDC Score Calculation: IKDC Score Calculation

Higher scores indicate higher levels of function and lower levels of symptoms, with the transformed score being regarded as a measure of function. If you have a score of 100, it means that you have no restrictions on your daily activities or athletic endeavors and don’t experience any symptoms.

When there are responses to at least 90% of the items, the IKDC Subjective Knee Form score can be determined (i.e. when responses have been provided for at least 16 items).

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