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Rigid versus soft foot orthoses. A single subject design
1Department of Physical Therapy, College of Health Professions, Northern Arizona University, Flagstaff 86011-5105.
Journal of the American Podiatric Medical Association
|December 1, 1991
Summary
Soft foot orthoses significantly reduced impact forces in a runner, suggesting material choice is crucial for preventing lower extremity injuries. Proper shock attenuation is key for athletes with fracture history.
Area of Science:
- Biomechanics
- Sports Medicine
- Orthotics
Background:
- Recurrent stress fractures in the tibia and metatarsals can be linked to biomechanical factors and inadequate shock absorption during locomotion.
- Foot orthoses are commonly used to manage lower extremity pain and injuries, but the type (rigid vs. soft) may influence their effectiveness.
Purpose of the Study:
- To compare the effects of rigid versus soft foot orthoses on forefoot and rearfoot forces.
- To evaluate the efficacy of different orthotic types in a runner with a history of stress fractures.
Main Methods:
- A single 20-year-old female runner with a history of tibial and metatarsal stress fractures participated in the study.
- Forefoot and rearfoot forces were measured during walking and running while wearing both rigid and soft foot orthoses.
Main Results:
- A soft foot orthosis significantly reduced vertical forces experienced through the foot during both walking and running activities.
- Rigid orthoses did not demonstrate the same level of force reduction compared to soft orthoses.
Conclusions:
- Soft foot orthoses appear more effective at attenuating impact forces compared to rigid orthoses in this case study.
- The selection of appropriate fabrication materials for foot orthoses is recommended for individuals prone to foot or lower extremity issues due to poor shock absorption.