Prostep - Support and correction for the low arch foot
You have selected a Prostep device for your patient because they have an SNA arch value of around 100° - 130°. This type of foot anatomy is often described as ‘pes planus’ and can be more commonly associated with significant foot related problems.
As this foot type is loaded with body weight, forces will generate greater than average heel eversion. As the heel everts the joint supporting the talus (ankle bone) becomes more angulated towards the ground.
The supportive medial shelf of bone on the calcaneus (sustentaculum tali (ST)) has a reduced ability to support the talus and this change transfers the loading force into the talo-navicular joint, which tends to bulge. This change creates instability of the midfoot joints while excessively loading the medial forefoot and the 1st toe extension score will be low.
By physically supporting the ST and reducing 1st Ray pressure, forces are normalised, function is restored and symptoms resolve. A choice of different densities is available with a number of individual posting options that should be selected for each foot. Choosing the density of device. Prostep is offered in two EVA densities: Medium 45 Shore A (blue) and Form 60 Shore A (black). The forces that cause symptoms can only be controlled if the density is selected carefully.
This can be made easier by considering the weight and activity level of the patient. Generally speaking, the heavier the patient or the higher the activity level, the firmer the density should be. I.e. Medium density models should only be used for lighter individuals who do not undertake high impact sports or recreational activities.
Choosing the length of device. Prostep is available in a full range of adult shoe sizes.
Patients will generally feel more comfortable when wearing a full-length orthosis as this eliminates any potential for sensing the edge of the device once it has been trimmed to fit the shoe. If this feels too tight or the shoe is of a more fashionable style, Prostep is available as a ¾ length model. Correct fitting for this shorter model is important and the front leading edge should sit 0.5 cm behind the metatarsal head area.
The Prostep Orthotics are part of the 3 Point Pivot System.
We recommend this product is fitted by a qualified healthcare professional.