This study examines the rehabilitation results when low-level laser therapy is applied in zone 5-8 extensor tendon injuries. Rehabilitation results will be evaluated with both objective measurements and patient reported outcome measures. The study was planned as a double-blind, placebo-controlled, randomized, two-arm study. Participants in both treatment groups will be given exercise therapy in accordance with the early active mobilization protocol and appropriate splint will be given to be used while exercising.

Inclusion Criteria:

• Being between the ages of 18-65
• Primary repair due to extensor tendon injury between Zones V-VIII
• Applying to the Hand Rehabilitation Policlinic at the end of the postoperative 1st week

Exclusion Criteria:

• Accompanying flexor tendon injury, fracture, vascular and / or nerve injury
• Active using of steroids or non-steroidal anti-inflammatory drugs
• Systemic infection or malignancy
• Pregnant or breastfeeding women
• Active wound infection
• Having a cognitive dysfunction