Anomalies of the median nerve On occasion, rare anomalies may be witnessed. Some of these occurrences that affect the median nerve structure include: ● Riche-Cannieu anastomoses, which result in a connection between the recurrent branch of the median nerve and the deep branch of the ulnar nerve within the hand. ● Martin-Gruber anastomoses, which result when median nerve branches cross each other in the antebrachium merging with the ulnar nerve, causing sensory and motor abnormalities in the anterior antebrachium. ● An extra artery, called the median artery, that may remain present upon birth, which creates an extra artery in the antebrachium and the hand. ● The median nerve bifurcating proximal to the carpal tunnel and/or carpal bones, rather than after exiting the carpal tunnel itself.
Hilton’s law states that a nerve innervating a muscle also supplies the skin, adjacent joints, and surrounding tissues with nervous signals. This law is important to understand for several reasons. First, knowing that the joint adjacent to a muscle is affected indicates that the musculotendon load at the neighboring joint region will likely carry additional stress on the injured nerve and muscle tissues, thus leading to strain injuries. Second, CTS may not initially be experienced with the obvious pain, tingling, or weakness that is typical of CTS; rather, vague skin sensations may initially be experienced. These sensations can clue a practitioner toward a CTS diagnosis. Third, if one presents with CTS symptoms (not merely the wrist), all joints within the region may need to be examined. This significant anatomical law, defined by John Hilton in 1860, demonstrates a key understanding about how healthcare professionals may interact with the nervous system when caring for individuals with neurological conditions such as CTS.
SIGNS AND SYMPTOMS
as hand strength weakens over time. Supportive wrist guards become a useful tool for the patient to supplement their lost strength. ● Interference with sleep: The paresthesia and similar sensations experienced often wake up patients several times per night. The lack of sleep creates a secondary list of health challenges and occupational concerns (Patel et al., 2014). Diagnostic features ● Compression of the anterior wrist, recreating the symptoms. Compression does not need to be deep; as little as one pound of pressure is enough to illicit a neurological or a pain response. ● A wrist square test measuring the ratio of wrist thickness to wrist width can be utilized. A value exceeding 0.7% indicates a higher risk of developing CTS. ● Examination of the wrist circumference itself. If wrist circumference is less than 6 inches for females or less than 7 inches for males, one is more at risk of acquiring CTS. ● X-rays that determine inflammation or structural damage to carpal bones can be a powerful diagnostic tool. ● Electromyogram tests will determine muscular activity within a region. Improper nerve supply causes the muscles to atrophy and activity to diminish. ● A nerve conduction study to determine electrical impulse flow through the wrist: This exam, combined with prior mentioned diagnostic tools, can become a powerful measure for CTS potential, as well as current diagnosis. (National Institute of Neurological Disorders and Stroke [NINDS], 2020)
Major signs and symptoms of carpal tunnel syndrome include these prominently witnessed phenomena: ● Atrophy of the thenar muscles : There are four thenar muscles located at the radial (thumb) side of the hand. When one presses their thumb next to the index finger, the thenar muscles create a bulge in this region. The four thenar muscles are: ○ the abductor pollicis brevis ○ the flexor pollicis brevis ○ the opponens pollicis ○ the adductor pollicis muscles ● The term pollicis refers to the thumb : Abductor pollicis brevis pulls the thumb away from the palm in a lateral manner. Flexor pollicis brevis pulls the thumb away from the palm in an anterior manner. Opponens pollicis pulls the thumb toward the other digits. Adductor pollicis pulls the thumb back toward the palm. If the hypothenar muscles are located at the ulnar (pinky) side of the hand atrophy, this indicates Guyon’s canal syndrome—an impingement of the ulnar nerve. ● Tingling, numbness of first 3.5 digits (thumb, index, middle, and radial half of ring fingers ): This is often referred to as paresthesia, a “pins and needles” sensation, and often accompanies the tingling and numbness experience by CTS patients. ● Pain in the wrist and hand : This pain usually worsens when the wrist is brought into a flexed (bent) position. It is experienced as a sharp, shooting pain radiating through the antebrachium. Chronic pain becomes nuanced as treatments and self-care become less effective or if the condition worsens over time. ● Loss of gripping and/or pinching strength : Lifting, carrying, and moving objects becomes more challenging
ECONOMIC IMPACT
results via Levine-Katz Carpal Tunnel and Pittsburgh Sleep Quality Index (PSQI) questionnaires, 66 CTS patients were tracked in three adult age ranges for at least 11 months. Results indicated that CTS patients slept 2.5 hours less than recommended for their respective age ranges and were more at risk for comorbid conditions. CTS patients consistently reported awakening on multiple occasions due to paresthesia and similar phenomena. Malalignment of the wrist joint (caused by various sleeping positions) is said to create these sensations. Patients with other sleep-related disorders, including sleep apnea, were excluded from the study to aid in data clarity (Patel et al., 2014).
The economic impact of carpal tunnel syndrome has been measured and researched by numerous organizations in recent decades. Impacts differ based on demographic and psychogenic factors, yet carpal tunnel syndrome has conclusively been found to negatively affect economies. According to Gabrielli and colleagues (2020), the number of carpal tunnel releases (CTRs) that were performed have increased by 38%. Work missed due to carpal tunnel syndrome has resulted in monetary loss to both individuals and the economy. Patients with CTS missed on average 28 days of work per year. Patel and colleagues (2014) published a journal article on the correlation of sleep disorders and CTS. Measuring
EliteLearning.com/Massage-Therapy
Book Code: MFL1227
Page 119
Powered by FlippingBook