Acoustic wave

Acoustic wave therapy – a new therapy approach for physiotherapy

Musculoskeletal disorders originating from muscles and tendons affects majority of general population. It impairs mobility, causes pain and reduces overall well being. Efforts are made constantly to treat these disorders. But often shows limited success due to wide range of competing technology options available and lack of time from the patient’s part. Acoustic wave application represents a new therapy approach.  Clinical experience has shown that a wide range of functional disorders can be treated effectively with Acoustic wave therapy.

Musculoskeletal disorders like epicondylitis, tendinopathies, sciatica ,dorsalgia, tensorfascia lata syndrome etc are very detrimental and are caused due to mechanical overstrain, trauma, poor posture, emotional stress or due to some  muscular disorder.

These disorders leads to physiological changes deep down in the tissues .There is  an increase calcium release leading to permanent contracture of actin/ myosin filaments and an increase in energy consumption. There is further capillary compression and leads to local ischemia. This causes a local energy crisis. Local ischemia causes bradykinin release, sensitizing the muscle nocioceptors and increase tenderness. Ischemia also causes motor end plate dysfunction and a vicious cycle is produced.

During Acoustic wave therapy, a high-intensity sound wave interacts with the tissues of the body. This leads to a flow of beneficial effects such as neovascularisation in growth, reversal of chronic inflammation, stimulation of collagen and dissolution of calcium build-up. Stimulation of these biological mechanisms creates an optimal healing environment. As the injured area is returned to normal, functionality is restored and pain is relieved.

conventional physiotherapy treatment of these Musculoskeletal disorder includes myofascial massage, electrical stimulation, ultrasound etc with some degree of success rate. Acoustic wave therapy on other hand  is enormously effective, shortens the treatment period and brings better results in long time follow-up.

Physiological Effects

Acoustic wave travels through a medium and comes to an interface, part of the wave is reflected and part transmitted. The dissipation of the energy at the interface results in generation of the physical, physiological and thus the therapeutic effects. The following are established treatment effects of Acoustic wave therapy.

• Acoustic wave create microrupters in tendon which stimulate the growth and remodelling of new arterioles and an increased blood supply. This results better oxygenation leading to faster healing of tendon.
• Acoustic waves force collagen fibres in to a longitudinal structure.These newly formed tendon fibres are more dense and stiff.
• Due to micro trauma to a tendon there is calcification formation. Acoustic wave therapy starts the biochemical decalcification.
• There is an increase in cellular activity. There is release of substance P, prostaglandin E2, NO, TGF β, VEGF,and other inflammatory cytokines..
• There is transient analgesic effect on afferent nerves.

Applications For Acoustic wave Therapy

Acoustic wave applications in physiotherapy is mostly associated with the treatment of chronic muscular and tendon disorders. Most common indications include:

Contraindications And Precautions

There are several areas or pathologies where concern has been expressed with regard to the use of Acoustic wave. This list is compiled from current available evidence and clinical experience.

• Patients who are haemophiliac or who are on anticoagulant therapy are best not treated with Acoustic wave.
• Malignancy remains on the contraindication list
• Infection in the local area should be treated with strong caution.
• It isadvicable to avoid epiphyseal regions
• During Acoustic wave therapy, it is crucial that pulmonary tissue is not within the target area of Acoustic wave.
• Relative contraindications include pregnancy.

Case Study:

A 38-year-old female, right hand dominant, house wife suffered from right elbow pain since nine months. The pain, worsened in the previous two weeks and was characterized as stiff, achy, and sometimes throbbing. On VAS scale she rated 9/10 on the very first day of assessment. The patient was no longer able to do daily activities at home and was unable to sleep at night

Initially she was treated with anti inflammatory and analgesics for 2 weeks.Thereafter she was treated with corticosteroid injection 3 times with no clinical improvement in pain. She was then treated with advance PRP injections which availed no relief but only aggravated the symptoms. The pain was noted to be at its worst in the morning, and was aggravated by extending the wrist to brush her teeth, open doors, and while washing clothes No numbness, tingling or weakness was noted in the hand. The patient denied previous trauma to her right elbow, but did recall a similar pain in his left elbow a few years earlier that resolved on its own with rest.

Upon inspection, lateral epicondyle and common extensor origin  appear to be inflamed when compared to the opposite side. All active ranges of motion of the elbow joints were full, while flexion and extension in the right wrist were limited due to pain. Passive range of motion, was also limited by patient discomfort particularly at the end range of right wrist flexion, and was able to reproduce the patient’s chief complaint at the right elbow. Resisted wrist extension and grip strength were very painful and the patient declined to provide much effort as this reproduced a sharp pain at the lateral epicondyle. Orthopedically, Cozen’s test (resisted wrist flexion from a flexed elbow and pro- nated/extended wrist position) was positive. Mill’s test, (passive extension of the elbow from a flexed elbow, pro- nated forearm and flexed wrist/finger position) was in- conclusive in that it was uncomfortable but did not produce pain at the lateral epicondyle.

The patient was diagnosed with lateral epicondylosis.

she was treated six times over two weeks with Acoustic wave. In addition to the soft tissue treatment, a rehabilitation program was performed, which was followed by 20 minutes of interferential current and 10 minutes of ice. After the first treatment the patient reported to feel 80% better, and at the time of discharge there was complete resolution of her symptoms (VAS 0/10 with no pain provocation on examination).

Hence Acoustic wave treatment is a good non invasive and result oriented treatment modality.