Shockwave Therapy at The Sports Medicine Specialists
Shock Wave Therapy (SWT) is a modality used for the treatment of a variety of musculoskeletal conditions, primarily applied to chronic conditions, particularly those affecting medium to large sized tendons and their insertions on bone such as:
Lateral Epicondylosis (Tennis Elbow)
Medial Epicondylosis (Golfer’s Elbow)
Calcific Tendonitis (supraspinatus tendon, etc.)
Patellar Tendonosis (Jumper’s Knee)
Chronic Stress/Non-union Fractures
SWT has been available in Canada since the mid-90s but has recently been popularized with the advent of low energy SWT. SWT is an intervention that stimulates the body’s natural healing process. Additionally, SWT has been shown to have a direct effect on local nerve endings resulting in a decrease in pain. It is important to understand the difference between low energy and high energy SWT when considering whether you are an appropriate candidate for SWT and which type of SWT is most likely to yield positive results in the treatment of your condition.
High energy SWT or “True” shock waves are classified as short duration (approx. 10msec) high energy pulses (5-100MPa) that break the sound barrier resulting in a “shock wave”. Our high energy shock wave technology allows the shock wave to be focused directly through the affected tissue resulting in several effects:
- Mechanical pressure and tension forces on the tissue which has been shown to increase cell membrane permeability thereby increasing microscopic circulation and therefore the metabolism within the treated area. This promotes healing and may result in the dissolution of calcific deposits.
- The pressure front creates behind it a “cavitation bubble” which are small empty cavities created behind a pressure front. When the bubbles collapse they create a resultant force that has a mechanical impact on the treated tissue. This force helps to break down calcific deposits embedded in damaged tissue.
- Shock waves stimulate osteoblasts that are cells responsible for bone healing and new bone production.
- Shock wave stimulate fibroblasts that are cells responsible for healing of connective tissue such as tendons.
- Diminishes pain by two mechanisms. Hyperstimulation anesthesia – local nerve endings are overwhelmed with so much stimuli that their activity diminishes resulting in short-term reduction in pain. Gate-control mechanism – whereby local nerves are stimulated to recalibrate perception of pain and result in longer-term reduction in pain.
There are three different mechanisms for generating high energy shock waves resulting in three different types of SWT device:
- Electromagnetic shockwave (Sonocur and Dornier Epos machines)
- Piezoelectric shockwave (Piezoson) * Electrohydraulic shockwave (I.E. HMT OssaTron machine) Low energy shock waves are generated by a radial pressure wave (I.E. Storz and Dolorcast machines).
This type of shock wave is more accurately described as a pressure wave and differs from “True” shock wave technology in the following ways:
- Low energy shock waves travel at a much slower speed and don’t break the sound barrier and hence a “True” shock wave is not produced.
- Low energy shock waves are longer, slower and less intense.
- Radial pressure waves diverge from the source unlike high energy shock waves that converge on a target, resulting in less energy applied to the tissue with low energy SWT vs. high energy SWT.
Due to the reduced cost of low energy shock wave machines many patients may have the impression that they have received “True” shock wave therapy. This impression is often generated by misinformed patients and uninformed practitioners. There certainly can be differences in effectiveness of high energy vs. low energy shock wave therapy. In general the effectiveness of SWT tends to be between 60%-80%. Compliance with treatment and rehabilitation recommendations are important factors in achieving optimal results.
The Sports Medicine Specialists (SMS) offer both high energy and low energy SWT. The type of SWT that is best suited for a particular patient is determined after consultation with their doctor or therapist at SMS. As providers of SWT for over 15 years, SMS is amongst the most experienced in Canada.
Contact Dr. Cameron Borody at The Sports Medicine Specialists for further information regarding Shock Wave Therapy. Call 416-481-1601 ext. 255 or email: email@example.com.