This randomized controlled superiority trial will compare a 6-week digital health rehabilitation program with a 6-week self-guided exercise program in adults with patellofemoral pain. Assessments will be performed at baseline, 6 weeks, and 18 weeks. The primary outcome will be change in AKPS from baseline to 6 weeks. Secondary outcomes will include pain intensity, self-reported function, psychological outcomes, quality of life, muscle strength, adherence, and adverse events.

Inclusion Criteria:

• Age 18-45 years
• Clinical diagnosis of patellofemoral pain
• Symptoms for at least 3 months
• Anterior or retropatellar knee pain provoked by at least two aggravating activities such as stair ambulation, squatting, running, jumping, or prolonged sitting
• Baseline pain intensity of at least 3/10 on the Numeric Rating Pain Scale
• Ability to provide written informed consent and comply with study procedures

Exclusion Criteria:

• Previous knee surgery
• Patellar dislocation or obvious instability
• Ligament injury, clinically important meniscal injury, moderate to severe knee osteoarthritis, or other major structural knee pathology
• Major hip, ankle, or lumbar disorders substantially affecting lower-limb function
• Neurological disorders affecting movement or balance
• Pregnancy
• Structured PFP rehabilitation within the previous 3 months
• Any other condition deemed unsuitable by the investigators