How to firmly secure hook-and-loop strapping to an orthosis?
An important aspect of any orthosis is the strapping used to attach the orthosis to the patient’s extremity.
Clinicians generally use hook-and-loop straps, often referred to by the trademarked name “Velcro”. These consist of two components: one featuring tiny hooks, the second featuring smaller loops. When the two are pressed together the hooks catch in the loops and the two pieces fasten or bind temporarily.
Did you know that the original hook-and-loop tape has its roots in nature?
The idea came from a Swiss engineer named George de Mestral. After hiking with his dog, he noted the many burs of the burdock plant stuck to his clothes and to the dog’s fur. After this, Mestral tried to recreate this concept with materials. Although he started in 1941, it was not until 1951 that de Mestral was able to mechanize the exact weaving and cutting process, and create hook and loop strips of materials. He received a patent for this in 1955. In 1958, an American columnist, Sylvia Porter, called this creation a “zipperless zipper”. It was used by the aerospace industry to help astronauts get in and out of their bulky space suits. George de Mestral was inducted into the National Inventors Hall of Fame for his invention.
Today, there are many different types of strapping materials on the market, made from nylon and/or polyester.
Most commonly, therapists attach the adhesive-backed hook directly to the orthosis and use the loop as strapping around the patient, as this part is softer and more comfortable.
Tips and tricks with hook-and-loop straps
- Remove the coating of the thermoplastic material
When using coated thermoplastic materials for the orthosis, it is helpful to scrape off the non-stick coating before applying the adhesive backed hook or loop strapping.
Thermoplastic materials are sticky in nature, so when you remove the non-stick coating you can take full advantage of the adhesive properties of the thermoplastic.
- Clean corners
Round the corners on the hook tape. It gives the orthosis a clean look and helps with the adherence to the orthosis. Sharp corners do not follow the curves of the orthosis very well, which could cause the tape to lift and come off.
- Use dry heat for a sticky surface
Apply dry heat (heat gun) lightly to the surface of the orthosis and to the adhesive glue of the hook.
The fibers of the loop strapping can be adhered directly into thermoplastic material when the coating has been removed, and the surface heated with dry heat. Do not use the heater on the loop directly as it will burn.
- Create a pulley
When the strap is wrapped through a slit opening, it lessens the force on the bond by acting as a pulley system (thus gaining a mechanical advantage), and further absorbing some of the force in friction around the tight bend.
We explain how to apply this technique in our instructional video for the basilar joint arthritis orthosis.
- Add a strip of thermoplastic material for a stronger bond
Use thin strips of Orficast or other thermoplastic materials as binding around the edges of the hook or loop attached directly to the orthosis. The dry heater makes these very sticky.
- Secure with a rivet
A small hole can be made in the loop strap before it is directly bonded to the orthosis. Fill in the hole with dry-heated thermoplastic material to create a rivet which helps to secure the strap.
These tips will help ensure that your hook and loop strapping remain in place and the orthosis is snug and secure on your patient’s extremity.
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