Backpack palsy (BPP)—or rucksack palsy or rucksack paralysis—is a type of brachial plexus injury associated with carrying a heavy backpack or similar load with excessive compression of the shoulder areas by straps. It is a known hazard for ruck-marching soldiers and for certain outdoor recreationalists (e.g. hikers, trekkers, mountaineers, etc) and certain labors (e.g., those carrying sandbags).
A particular risk factor rises when bearing heavy backpack loads without any waist support (i.e., all the weight borne by the shoulders).
Typical upper extremity symptoms are paresis (i.e., weakness of voluntary movement, or partial loss of voluntary movement or impaired movement), numbness, and paresthesias (“pins and needles” sensation) after carrying a heavy load with shoulder-straps of a backpack, or similar burden. The syndrome is generally painless. Neuralgic pain, as seen with other acute brachial neuropathies (see Parsonage–Turner syndrome), is not a feature. The long thoracic nerve is often the critically affected organ. (In this case the serratus anterior muscle is palsied and a "winged scapula" may be the result.) The shoulder girdle and elbow flexors are usually the most severely affected. Sensory disturbances can occur in the lateral shoulder and arm region and in forearm and hand (especially the radial aspects). Atrophy of the affected muscles may develop long term in a minority of cases.
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Backpack palsy can be prevented by making a change in the backpack design. If the straps are designed in a way that puts more diffuse pressure on the shoulders, then the likelihood of backpack palsy is decreased.
Prognosis is not well understood, as about two-thirds of patients recover completely, or mostly, within 6 months. As for the remainder, the duration of prolonged recovery is unstudied.
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