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Crutch

life science Maturity 9-11 Next article →

A crutch is a mobility aid designed to transfer weight from the legs to the upper body.

Me on crutches
Me on crutches

These devices are essential for individuals who cannot use their legs to support their body weight. People may require crutches for short-term injuries or for lifelong disabilities. By shifting the physical load, crutches allow for movement when the lower limbs are compromised. They serve as a vital component of assistive technology for human mobility.

There are several distinct types of crutches, each serving different physical needs. Axillary crutches, also called underarm crutches, are common for temporary restrictions on walking.

Me on crutches
Me on crutches

The user places a pad against the ribcage just below the armpit. They then hold a grip located below and parallel to that pad. Some axillary models are spring-loaded to help users propel themselves further. However, research indicates that the speed increase from these springs is actually very small. Users must be careful with axillary crutches to avoid nerve damage. Pressure on the brachial plexus in the axilla can cause a condition called crutch palsy. In these cases, the radial nerve is most frequently affected, followed by the ulnar nerve.

Forearm crutches, often called elbow or Lofstrand crutches, are very different.

Man standing with forearm crutches
Man standing with forearm crutches

These feature a cuff that wraps around the user's forearm. The user inserts their arm into the cuff and holds a grip. The cuffs are often made of metal or plastic. They can be full circles or half-circles with a V-type opening. This opening allows the arm to slip out easily during a fall. Forearm crutches are the dominant type used throughout Europe. In other regions, they are more common for people with long-term disabilities.

Other specialized designs exist for specific physical limitations. Platform crutches are used by people with poor hand or grip strength.

Platform-crutch
Platform-crutch

These users rest their forearm on a horizontal platform or trough. They are usually secured with velcro-type straps that release during a fall. The hand holds an angled grip that can be adjusted for length and sway. There are also non-traditional leg supports for single-leg injuries.

A student nurse, acting as physical therapist 8b07715v
A student nurse, acting as physical therapist 8b07715v

These strap the affected leg into a frame to keep it off the ground. This transfers the load to the user's thigh or knee. This design allows walking without using the hands or arms. It may also help reduce upper thigh atrophy because the leg remains in use.

History shows that humans have sought mobility assistance for millennia. Crutches were used as far back as ancient Egypt. In 1917, Emile Schlick patented the first commercially produced crutch. His design was a walking stick that included an upper arm support. Later, A.R. Lofstrand Jr. developed crutches with a height-adjustable feature. This innovation allowed the tools to be customized to the user. Despite these advancements, the classic design remains the most common today.

To move effectively, users must master specific patterns called gaits.

A student nurse, acting as physical therapist 8b07715v
A student nurse, acting as physical therapist 8b07715v

A four-point gait is the slowest but safest method. It follows a sequence: right crutch, left leg, left crutch, then right leg. This keeps three points of contact with the ground at all times. A two-point gait is faster and involves moving a crutch and the opposite leg simultaneously. For those who cannot bear weight on one leg, a three-point gait is used. In this gait, both crutches move forward first, followed by the unaffected leg. There is also a "swing-to" gait for non-weight bearing injuries. In this method, the user places both crutches in front and swings the uninjured leg to them.

Navigating stairs also requires specific techniques depending on the direction. When climbing stairs, the unaffected leg moves up first. Then, the affected leg and the crutches move up together. When descending stairs, the process is reversed. The crutches move down first, followed by the affected leg and then the unaffected leg. If crutches are not suitable, people may use wheelchairs or knee scooters. While these are wheeled alternatives, they often cannot negotiate stairs as easily as crutches can. Modern crutches are manufactured from many materials, including wood, steel, aluminum, and titanium. They may also use carbon fiber or glass fiber reinforced composites and thermoplastics.

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File:Me on crutches.jpg
Me on crutches.jpg
File:Man_standing_with_forearm_crutches.jpg
Man_standing_with_forearm_crutches.jpg
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File:Platform-crutch.jpg
Platform-crutch.jpg
File:A student nurse, acting as physical therapist 8b07715v.jpg
A student nurse, acting as physical...
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