Physical Therapy Assistant Practice Exam

What percentage of a patient's body weight is most representative of the force needed to overcome friction during mechanical lumbar traction?

1. 20%

2. 25%

3. 30%

4. 35%

The correct answer is: 25%

When considering the force required to overcome friction during mechanical lumbar traction, a common guideline used in clinical practice is that approximately 25% of a patient's body weight is generally considered sufficient to achieve this goal. This percentage is based on the understanding that traction aims to create space in the intervertebral discs and relieve pressure on spinal nerves, which requires a balance between the force applied and the friction created by the patient's body against the treatment surface. Applying 25% of body weight helps to ensure that the traction force is both effective in mobilizing the spine and manageable, minimizing the risk of injury or discomfort to the patient. This calibration helps in providing an effective treatment while being mindful of the patient's tolerance and safety. In contrast, higher percentages may lead to excessive force that could surpass what is needed and potentially harm the patient, while lower percentages may not provide enough traction to be effective in alleviating symptoms. Hence, the identified percentage is rooted in both clinical guidelines and practical outcomes in lumbar traction therapy.