Clinical calculator

IKDC Calculator

Calculate your IKDC score (International Knee Documentation Committee) — the international standard for subjective knee evaluation.

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IKDC Subjective Knee Form

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Instructions

This survey asks for your view about your knee. This information will help us keep track of how you feel about your knee and how well you are able to do your usual activities. Answer every question by ticking the appropriate box. If you are unsure about how to answer a question, please give the best answer you can.

A — Symptoms

1. What is the highest level of activity that you can perform without significant knee pain?

2. During the past 4 weeks, or since your injury, how often have you had pain?

Never Constant

3. If you have pain, how severe is it?

No pain Worst pain imaginable

4. During the past 4 weeks, or since your injury, how stiff or swollen was your knee?

5. What is the highest level of activity you can perform without significant swelling in your knee?

6. During the past 4 weeks, or since your injury, did your knee lock or catch?

Yes No

7. What is the highest level of activity you can perform without significant giving way in your knee?

B — Sports Activities

C — Function

How would you rate the function of your knee on a scale of 0 to 10 with 10 being normal, excellent function and 0 being the inability to perform any of your usual daily activities?

10a. Function prior to your knee injury

(not included in score calculation)

Couldn't perform daily activities No limitations in daily activities

10b. Current function of your knee

Couldn't perform daily activities No limitations in daily activities

How to interpret your IKDC score

≥ 80 — Good function

The knee shows good function. Generally associated with return to sports activity and satisfactory quality of life.

50 – 79 — Moderate limitation

The knee shows moderate functional limitation. There may be restrictions in higher-impact activities.

< 50 — Significant limitation

The knee shows significant functional limitation. Specialist evaluation is strongly recommended.

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Frequently asked questions

What is the IKDC? ⌄

The IKDC (International Knee Documentation Committee) is an internationally validated questionnaire assessing symptoms, function and sports activity in patients with knee injuries, especially ligaments and menisci. It is the standard for publications on knee ligament treatment outcomes.

How is the score calculated? ⌄

All item scores are summed, excluding the prior knee function (10a). The total is divided by the maximum possible score (87) and multiplied by 100. A score of 100 means no limitation and no symptoms.

What does each score range mean? ⌄

Score ≥ 80: good function, generally compatible with return to sport. Score 50–79: moderate limitation. Score < 50: significant limitation, specialist evaluation recommended.

Does this calculator replace a medical consultation? ⌄

No. This tool is only a clinical scoring aid and does not replace evaluation by a qualified healthcare professional.

References

1. Anderson, A. F., Federspiel, C. F., and Snyder, R. B. “Evaluation of knee ligament rating systems.” Am J Knee Surg, 6.2 (1993): 67-73.
2. Irrgang, J. J., et al. “Development and validation of the international knee documentation committee subjective knee form.” The American Journal of Sports Medicine, 29.5 (2001): 600-613.