Which of the following are benefits of maintaining proper body mechanics?

Body mechanics involves the coordinated effort of muscles, bones, and the nervous system to maintain balance, posture, and alignment during moving, transferring, and positioning patients. Proper body mechanics allows individuals to carry out activities without excessive use of energy, and helps prevent injuries for patients and health care providers (Perry, Potter, & Ostendorf, 2014).

Musculoskeletal Injuries

A musculoskeletal injury (MSI) is an injury or disorder of the muscles, tendons, ligaments, joints or nerves, blood vessels, or related soft tissue including a sprain, strain, or inflammation related to a work injury. MSIs are the most common health hazard for health care providers (WorkSafeBC, 2013). Table 3.1 lists risk factors that contribute to an MSI.

Table 3.1 Factors That Contribute to an MSI

Factor

Special Information

Ergonomic risk factorsRepetitive or sustained awkward postures, repetition, or forceful exertionIndividual risk factorsPoor work practice; poor overall health (smoking, drinking alcohol, and obesity); poor rest and recovery; poor fitness, hydration, and nutritionData source: Perry et al., 2014; Workers Compensation Board, 2001; WorkSafeBC, 2013

When health care providers are exposed to ergonomic risk factors, they become fatigued and risk musculoskeletal imbalance. Additional exposure related to individual risk factors puts health care providers at increased risk for an MSI (WorkSafeBC, 2013). Preventing an MSI is achieved by understanding the elements of body mechanics, applying the principles of body mechanics to all work-related activities, understanding how to assess a patient’s ability to position or transfer, and learning safe handling transfers and positioning techniques.

Elements of Body Mechanics

Body movement requires coordinated muscle activity and neurological integration. It involves the basic elements of body alignment (posture), balance, and coordinated movement. Body alignment and posture bring body parts into position to promote optimal balance and body function. When the body is well aligned, whether standing, sitting, or lying, the strain on the joints, muscles, tendons, and ligaments is minimized (WorkSafeBC, 2013).

Body alignment is achieved by placing one body part in line with another body part in a vertical or horizontal line. Correct alignment contributes to body balance and decreases strain on muscle-skeletal structures. Without this balance, the risk of falls and injuries increase. In the language of body mechanics, the centre of gravity is the centre of the weight of an object or person. A lower centre of gravity increases stability. This can be achieved by bending the knees and bringing the centre of gravity closer to the base of support, keeping the back straight. A wide base of support is the foundation for stability. A wide base of support is achieved by placing feet a comfortable, shoulder width distance apart. When a vertical line falls from the centre of gravity through the wide base of support, body balance is achieved. If the vertical line moves outside the base of support, the body will lose balance.

The diagram in Figure 3.1 demonstrates (A) a well-aligned person whose balance is maintained and whose line of gravity falls within the base of support. Diagram (B) demonstrates how balance is not maintained when the line of gravity falls outside the base of support, and diagram (C) shows how balance is regained when the line of gravity falls within the base of support.

Figure 3.1 Centre of gravity

Principles of Body Mechanics

Table 3.2 describes the principles of body mechanics that should be applied during all patient-handling activities.

Table 3.2 Principles of Body MechanicsAction PrincipleAssess the environment.Assess the weight of the load before lifting and determine if assistance is required.Plan the move.Plan the move; gather all supplies and clear the area of obstacles.Avoid stretching and twisting.Avoid stretching, reaching, and twisting, which may place the line of gravity outside the base of support.Ensure proper body stance.Keep stance (feet) shoulder-width apart.

Tighten abdominal, gluteal, and leg muscles in anticipation of the move.

Stand up straight to protect the back and provide balance.

Stand close to the object being moved.Place the weight of the object being moved close to your centre of gravity for balance.

Equilibrium is maintained as long as the line of gravity passes through its base of support.

Hold objects close to your centre of gravityFace direction of the movement.Facing the direction prevents abnormal twisting of the spine.Avoid lifting.Turning, rolling, pivoting, and leverage requires less work than lifting.

Do not lift if possible; use mechanical lifts as required.

Encourage the patient to help as much as possible.

Work at waist level.Keep all work at waist level to avoid stooping.

Raise the height of the bed or object if possible.

Do not bend at the waist.

Reduce friction between surfaces.Reduce friction between surfaces so that less force is required to move the patient.Bend the knees.Bending the knees maintains your centre of gravity and lets the strong muscles of your legs do the lifting.Push the object rather than pull it, and maintain continuous movement.It is easier to push an object than to pull it.

Less energy is required to keep an object moving than it is to stop and start it.

Use assistive devices.Use assistive devices (gait belt, slider boards, mechanical lifts) as required to position patients and transfer them from one surface to another.Work with others.The person with the heaviest load should coordinate all the effort of the others involved in the handling technique.Data source: Berman & Snyder, 2016; Perry et al., 2014; WorkSafeBC, 2013

Assistive Devices

An assistive device is an object or piece of equipment designed to help a patient with activities of daily living, such as a walker, cane, gait belt, or mechanical lift (WorkSafeBC, 2006). Table 3.3 lists some assistive devices found in the hospital and community setting.

Table 3.3 Assistive DevicesTypeDefinitionGait belt or transfer beltUsed to ensure a good grip on unstable patients. The device provides more stability when transferring patients. It is a 2-inch-wide (5 mm) belt, with or without handles, that is placed around a patient’s waist and fastened with Velcro. The gait belt must always be applied on top of clothing or gown to protect the patient’s skin. A gait belt can be used with patients in both one-person or two-person pivot transfer, or in transfer with a slider board.Gait beltSlider board or transfer boardSlider board (red) on a stretcherPlacing a slider board (transfer board) under a patient

A slider board is used to transfer immobile patients from one surface to another while the patient is lying supine. The board allows health care providers to safely move immobile, bariatric, or complex patients.

Which of the following are benefits of proper body alignment?

What are the 4 principles of body mechanics?

What are the 3 important concepts related to body mechanics?

Which of the following are characteristics of proper body mechanics?