Crutches:A crutch is a mobility aid that transfers weight from the legs to the upper body. Often used by people who are unable to use their legs to support their weight, for reasons ranging from short-term to lifelong disability. Many athletes tend to use crutches due to the injuries they experience in daily sports. How long they need to use them also depends on the severity of their injury or their rehabilitation time. When trying to understand what is wrong with a patient, an EMG analysis can be performed to measure the Odine EMG. With an EMG measurement you can see what is relevant for documenting the response to rehabilitation programs, the effects of physiotherapy and the analysis of balance and muscle activity (Airaksinen, 1998, p.1 ). There are four types of crutches: forearm, underarm, platform, and leg support. The forearm crutch is used by inserting the arm into a cuff and holding the handle. The cuff, usually plastic or metal, may be a semi-circle or full circle with a V-shaped opening in the front allowing the forearm to slide out in the event of a fall. The armpit crutch, also called an axillary crutch, is used by placing the cushion against the rib cage under the armpit and holding the handle, which is below and parallel to the cushion. The platform is not often used by patients due to arthritis, cerebral palsy and other conditions. The arm rests on a handle which, if properly designed, can be angled appropriately depending on the user's disability. The leg support is commonly used when the user has an injury affecting only one leg. This device works by strapping the affected leg into a support frame that simultaneously keeps the lower leg off the ground during transfer...... middle of paper ...... this is the analysis of the feasible region. Theory of mechanisms and machines, 2-8.7. Rice, I., Jayaraman, C., Hsiao-Wecksler, ET, and Sosnoff, JJ (2014). Relationship between shoulder pain and kinetic and temporal-spatial variability in wheelchair users. Archives of Physical Medicine and Rehabilitation, 699-704.8. Takanokura, M. (2009). Optimal handle height of the four-wheel walker in various road conditions to reduce the muscle load of elderly users with regular walking. Journal of Biomechanics, 843-848.9. Wendland, D. and Sprigle, SH (2012). Activity monitor accuracy in people using canes. Journal of Rehabilitation Research and Development, 49(8), 1261-1268.10. Seeley, M.K., Hunter, I., Bateman, T., Roggia, A., Larson, B.J., & Draper, D.O. (2011). A kinematic comparison of spring and traditional crutches. Sports Rehabilitation Journal, 20(2), 198-206.