Ultrasonic Diathermy: Advantages and Disadvantages

This page outlines the pros and cons of ultrasonic diathermy, along with its basic principles. It details the benefits (advantages) and drawbacks (disadvantages) of this treatment method.

What is Ultrasonic Diathermy?

Diathermy employs electric current to generate heat deep within targeted tissue, reaching depths of up to two inches beneath the skin’s surface. Various techniques exist to generate heat in the targeted body part, including short wave, long wave, microwave, ultrasonic, and laser diathermy.

Ultrasound diathermy, specifically, uses high-frequency sound waves to treat deep tissues. The heat is produced by tissue vibration, which promotes blood flow to the area. It’s used for various musculoskeletal strains and fractures. These devices utilize sound waves in the 1 to 3 MHz range. 1 MHz is used for deep penetration (5 cm), while 3 MHz is used for superficial penetration (2 cm).

Figure: Ultrasonic diathermy equipment with its internal modules.

Working Principle

The device operates on the principle that sound waves are absorbed by high-protein tissues such as tendons, ligaments, joint capsules, and muscle. Bone absorbs a significant amount of these waves.

Ultrasonic waves generate high-speed mechanical vibrations within the cells of absorptive tissues, providing a micro-level massage. The ultrasonic diathermy device employs a piezoelectric crystal, which generates ultrasonic energy when an oscillator output is applied.

The depth of penetration can be controlled, allowing for targeted treatment of specific tissues. It can be administered in two modes: pulsed and continuous.

Benefits (Advantages) of Ultrasonic Diathermy

Here are the key benefits:

• Reduces Inflammation and Swelling: Helps reduce chronic inflammation and local swelling.
• Promotes Fracture Healing: Aids in the healing of bone fractures.
• Inexpensive and Non-Invasive: It is an inexpensive, quick, and non-invasive treatment option.
• Fetal Problem Detection: It can be used to detect fetus problems.
• Treats Collagenous Tissues: In continuous mode, it is used to heal dense collagenous tissues.
• Speeds Healing Process: Ultrasound energy causes rapid contraction and expansion of microscopic gas bubbles around the affected tissue, speeding up the healing process.
• Safe for Patient and Operator: No known hazards to either the patient or the operator.
• Controllable Parameters: Intensity and frequency can be controlled, allowing for targeted treatment at appropriate depths.

Drawbacks (Disadvantages) of Ultrasonic Diathermy

Here are the key drawbacks:

• Frequency Limitations: Ultrasonic diathermy equipment can typically not generate ultrasonic frequencies above 3 MHz. Furthermore, oscillation frequency is temperature-dependent.
• Contraindications: Not recommended for patients with open wounds or pregnant women.
• Avoidance of Gas-Filled Areas: Ultrasound therapy cannot be used in areas containing gas, such as the lungs.
• Limited Bone Penetration: Provides inaccurate results in detecting physical abnormalities as it doesn’t pass through bones.
• Head and Neck Limitations: Has limited use in the head and neck region, as sound waves are significantly absorbed by bone, restricting its use to superficial structures.