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NCT Number: NCT07829835

Comparison of Low-Level Laser Therapy Versus Infrared Therapy in Grade II ACL Injury Rehabilitation

This study is being conducted to compare two commonly used physical therapy treatments, low-level laser therapy (LLLT) and infrared therapy, for people with a Grade II anterior cruciate ligament (ACL) injury of the knee.

A Grade II ACL injury is a partial tear of the ACL, which may cause knee pain, reduced movement, weakness, and difficulty performing daily or physical activities. Rehabilitation is an important part of recovery after this type of injury. Physical therapy may help reduce symptoms and improve knee function and confidence during movement.

In this randomized controlled trial, participants with a Grade II ACL injury will be assigned to one of two treatment groups. One group will receive low-level laser therapy along with standard physiotherapy, while the other group will receive infrared therapy along with the same standard physiotherapy program.

The low-level laser therapy group will receive laser treatment in addition to exercises used in standard physiotherapy. The infrared therapy group will receive infrared treatment in addition to the same standard physiotherapy exercises. The standard physiotherapy program includes knee range-of-motion exercises, knee isometric strengthening exercises, and light aerobic exercises.

Treatment will be provided five days per week for four weeks. Participants will be assessed before treatment and again after completion of the four-week rehabilitation program.

The main outcomes of the study include pain intensity and psychological readiness to return to activity following an ACL injury. Pain will be assessed using the Numeric Pain Rating Scale (NPRS), while psychological readiness will be assessed using the Anterior Cruciate Ligament-Return to Sport after Injury (ACL-RSI) scale. Magnetic resonance imaging (MRI) findings will also be considered in relation to the ACL injury.

The purpose of this study is to determine whether low-level laser therapy or infrared therapy, when combined with standard physiotherapy, provides greater improvement in patients undergoing rehabilitation for Grade II ACL injury. The findings may help physiotherapists and other health care providers select an appropriate adjunct treatment during ACL rehabilitation.

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Key information

Conditions

ACL-injury Anterior Cruciate Ligament Injuries Knee Injuries Leg Injuries Wounds and Injuries

Age range

15 year–45 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Enzee Clinic, Lahore, Punjab Province, Pakistan

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Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Participants aged 15-45 years.

  • Male and female participants.
  • Participants with Grade II ACL injury diagnosed through MRI as prescribed by an orthopedic surgeon or orthopedic physician.
  • MRI findings confirming a partial/Grade II ACL injury following orthopedic referral.
  • Positive results from ACL special tests, including the pivot-shift, anterior drawer, and Lachman tests.
  • Participants with MRI findings consistent with a partial or Grade II ACL injury and clinical symptoms suggestive of ACL instability.
  • Athletes participating in football, soccer, cricket, basketball, volleyball, badminton, or running.
  • OPD patients.

Exclusion criteria

  • Fracture of the affected knee or associated lower-limb fracture.
  • Neurological or systemic disorders.
  • Participants who are not medically cleared for conservative physiotherapy rehabilitation.

Treatment and study plan

Low-level laser therapy (LLLT)

Device

low-Level Laser Therapy was applied to the knee/ACL region using an 808 nm wavelength and 150 mW power for 10 minutes per session, 5 sessions per week for 4 weeks. It was administered in addition to the standardized physiotherapy program..

Infrared Therapy (IRT)

Device

Infrared therapy was applied to the knee/ACL region using a 100 W infrared lamp for 10 minutes per session, 5 sessions per week for 4 weeks. It was administered in addition to the standardized physiotherapy program..

Standard Physiotherapy

Other

The standardized physiotherapy program included knee isometric strengthening, range of motion exercises, proprioception and balance training, light aerobic conditioning, and manual therapy. The program was provided in addition to the assigned treatment intervention for 5 sessions per week for 4 weeks.

Primary outcomes

  1. Change in pain intensity measured by the Numeric Pain Rating Scale (NPRS)

    Time frame: Baseline (week 0) and after 4 weeks of treatment

    Pain intensity will be assessed using the Numeric Pain Rating Scale (NPRS), a 0-10 scale in which 0 represents no pain and 10 represents the worst imaginable pain. NPRS will be assessed at baseline (week 0) and after completion of the 4-week intervention.

Secondary outcomes

  1. Change in psychological readiness to return to sport measured by the ACL-RSI

    Time frame: Baseline (week 0) and after 4 weeks of treatment

    Psychological readiness to return to sport will be assessed using the Anterior Cruciate Ligament-Return to Sport after Injury (ACL-RSI) scale. The scale assesses psychological factors related to return to physical activity, including confidence, fear, and perceived risk. Higher scores indicate greater psychological readiness.

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Sponsors and collaborators

Lead sponsor

Superior University

Other

Registry information

Official study title

Comparison of Low-Level Laser Therapy (LLLT) Versus Infrared Therapy (IRT) in Rehabilitation of Grade II Anterior Cruciate Ligament Injury: A Randomized Controlled Trial

Important dates

Study start
2026
Primary completion
2026
Study completion
2026
First posted
Sep 21, 2026
Registry last updated
Sep 21, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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