Validity and Reliability of Video-Based Functional Physiotherapy Assessment of Subacute Knee Injuries

Number of Participants with Agreement in Diagnostic Categories from Functional In-Person Assessment

Primary outcome is whether the system-level diagnosis (diagnostic category) assigned by the physiotherapist matches across in-person assessments with or without specific tests - functional assessment compared to traditional assessment with specific tests. Diagnoses are categorized into five predefined groups: ligament, meniscus, joint-related, soft tissue, and other. Within each category, physiotherapists assign specific ICD-10 codes. Outcome is measured as match/mismatch between diagnostic categories.

Number of Participants with Agreement in Diagnostic Categories - Digital Assessment Based on Patient History

Primary outcome is whether the system-level diagnosis (diagnostic category) assigned by the physiotherapist matches across digital assessment with only patient history compared with traditional in person assessment with specific tests. Diagnoses are categorized into five predefined groups: ligament, meniscus, joint-related, soft tissue, and other. Within each category, physiotherapists assign specific ICD-10 codes. Outcome is measured as match/mismatch between diagnostic categories.

Number of Participants with Agreement in Diagnostic Categories - Digital Assessment Based on Patient History and Functional Evaluation

Primary outcome is whether the system-level diagnosis (diagnostic category) assigned by the physiotherapist matches across digital assessment with traditional in person assessment with specific tests. Diagnoses are categorized into five predefined groups: ligament, meniscus, joint-related, soft tissue, and other. Within each category, physiotherapists assign specific ICD-10 codes. Outcome is measured as match/mismatch between diagnostic categories.

Number of participants with agreement in test results of functional assessment

Primary outcome is whether the test results from the functional tests performed in the video consultation differs from in-person functional assessment.

Degree of diagnostic certainty

After each assessment, the physiotherapists will rate their level of diagnostic certainty on a scale from 0 (not confident) to 100 (fully confident), for a total of four ratings. A) digital patient history assessment B) digital functional assessment C) in-person functional assessment D) in-person specific tests

Number of Participants with Agreement on Specific Diagnostic Categories

The physiotherapists will diagnose with pre-defined ICD-10 diagnoses. All assessments will be compared on a specific diagnostic level.

Patient-Rated Satisfaction With the Assessment

Patient satisfaction will be measured after each knee assessment session using a modified item from the Swedish instrument "Quality from the Patient's Perspective" (QPP). The selected item is: "I received the best possible examination (as far as I can judge myself)." Patients rate their agreement on a 5-point Likert scale: Strongly agree, Mostly agree, Partly agree, Do not agree at all, and Not applicable. The response is collected via a secure web-based form.

Adverse events

Demographic data

Background information about each participant will be collected. Collected data includes age, sex, origin, height, weight, experience of knee symptoms, pain intensity, pain duration, previous experience with video consultations, travel distance (in kilometers) between home/start point and the clinic, and results from the knee assessments. Travel distance is recorded to enable analysis of transport and environmental aspects.

Knee Pain Intensity Measured by Numeric Rating Scale (NRS)

Pain intensity will be assessed using the Numeric Rating Scale (NRS), where participants rate their current knee pain, average pain over the past week, and the lowest and highest pain intensity experienced during the past week. Ratings are given on a scale from 0 (no pain) to 10 (worst imaginable pain). NRS has strong correlation with the Visual Analog Scale (VAS) and demonstrates high reliability (intraclass correlation coefficient = 0.95). The minimal detectable change is 1.3.

Knee Injury and Osteoarthritis Outcome Score - 12 Items (KOOS-12)

KOOS-12 is a shortened version of the original KOOS instrument, consisting of 12 items across three dimensions: pain, function, and quality of life. Each item is scored from 0 (no problems) to 4 (extreme problems). Scores for each dimension are summed and converted to a 0-100 scale, where lower scores indicate more severe symptoms and higher scores indicate milder symptoms. KOOS-12 has demonstrated good reliability, validity, and responsiveness.