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Ultrasound Therapy – Effects, Uses and Benefits

Ultrasound therapy is a physical treatment method that uses high-frequency sound waves to relieve pain and promote tissue healing in muscles, tendons, and joints.

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Things worth knowing about "Ultrasound Therapy"

Ultrasound therapy is a physical treatment method that uses high-frequency sound waves to relieve pain and promote tissue healing in muscles, tendons, and joints.

What is Ultrasound Therapy?

Ultrasound therapy is a well-established physical treatment method widely used in physiotherapy, orthopedics, and sports medicine. It involves the generation of high-frequency sound waves in the range of 0.8 to 3 MHz, which are directed into body tissues. These sound waves are inaudible to the human ear and produce both thermal and mechanical effects in the tissue, contributing to pain relief, reduction of swelling, and tissue regeneration.

Mechanism of Action

The therapeutic effects of ultrasound are based on two primary mechanisms:

Thermal effect: As sound waves are absorbed by tissue, heat is generated. This improves blood circulation, relaxes muscle tension, and increases tissue extensibility.
Mechanical effect (cavitation and micro-massage): The vibrations of the sound waves create microscopic pressure changes in the tissue, acting as a micro-massage. This effect stimulates cellular metabolism and promotes the resorption of edema and inflammatory by-products.

Depending on the device settings, ultrasound can be applied in continuous mode (primarily thermal) or pulsed mode (primarily mechanical, with less heat generation).

Indications

Ultrasound therapy is used for a wide range of conditions and complaints, including:

Muscle and tendon disorders (e.g., tendinopathies, shoulder impingement syndrome)
Degenerative joint diseases such as osteoarthritis
Sports injuries (e.g., muscle strains, contusions)
Scar tissue management and improvement of scar elasticity
Chronic musculoskeletal pain conditions
Inflammatory soft tissue conditions (e.g., bursitis, fasciitis)

Treatment Procedure

Ultrasound therapy is typically performed by a physiotherapist or qualified medical professional. A transducer head (sound head) is applied to the skin with a special contact gel to ensure optimal sound transmission. The transducer is moved in circular or uniform patterns over the treatment area.

A typical treatment session lasts 5 to 10 minutes. A course of treatment usually consists of several sessions (typically 5 to 15 sessions) to achieve a lasting therapeutic effect.

Phonophoresis

A specialized form of ultrasound therapy is known as phonophoresis. In this approach, anti-inflammatory or analgesic medications (e.g., diclofenac gel) are used as the contact medium. The ultrasound is intended to enhance the penetration depth of the active substances into the tissue, although the scientific evidence for this effect is still being investigated.

Contraindications

Ultrasound therapy is not suitable for all patients. The following contraindications must be considered:

Application over implants (e.g., pacemakers, metal implants in the treatment area)
Application over tumor tissue or in patients with active cancer
Pregnancy (application over the abdomen or spine)
Acute inflammation or infection in the treatment area
Deep vein thrombosis or thrombophlebitis
Application directly over growth plates in children and adolescents

Safety and Side Effects

When applied correctly, ultrasound therapy is considered a safe and well-tolerated procedure. Possible side effects are rare and may include mild skin redness or a sensation of warmth in the treated area. Serious adverse effects are not expected when contraindications are observed and the therapy is properly administered.

Scientific Evidence

The scientific evidence for ultrasound therapy varies depending on the indication. For certain conditions such as calcific tendinitis (calcific shoulder) and soft tissue disorders, clinical studies have shown positive outcomes. For other indications, the evidence is less conclusive, which is why ultrasound therapy is most commonly used as part of a comprehensive physiotherapy treatment plan.

References

Draper, D. O. et al. (2014): Ultrasound in physical therapy - clinical applications and evidence. Journal of Athletic Training, 49(1), 56-67.
Robertson, V. J. et al. (2006): Electrotherapy Explained - Principles and Practice. 4th edition. Butterworth-Heinemann, Edinburgh.
Zeng, C. et al. (2014): Effectiveness of continuous and pulsed ultrasound for the management of knee osteoarthritis: a systematic review and network meta-analysis. Osteoarthritis and Cartilage, 22(8), 1090-1099.

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