• Short-form assessment of physical function in patients with knee issues.
• Efficient large-scale screening in busy clinical or research settings.
• Monitoring functional recovery after knee surgery or conservative treatment.

• 1. Rising from bed / getting in/out of bed.
• 2. Putting on / taking off socks.
• 3. Rising from a low chair.
• 4. Getting in / out of a car.
• 5. Going up / down stairs.
• 6. Squatting.
• 7. Running / jumping.

Items are rated 0 (None) to 4 (Extreme). A raw sum score (0–28) is calculated first.

While the KOOS-PS is efficient for tracking "Physical Function," it lacks the "Symptoms," "Pain," and "Quality of Life" domains of the full KOOS. It is best used as a rapid screening tool rather than a comprehensive outcome measure.

• Higher scores = Better function (No difficulty).
• Lower scores = Greater difficulty / Extreme problems.
• Highly responsive in the early post-operative period (0–6 months).

• Low Functional Score: Prioritize range of motion and weight-bearing strengthening.
• Progression: If function improves but the patient still reports "locking" or "giving way," consider switching to the full KOOS to capture the "Symptoms" domain.
• Research Data: Ensure the interval-converted score is used for any statistical comparisons.