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Work-Related Ill Health
Published in Céline McKeown, Office Ergonomics and Human Factors, 2018
If the movement of the tendon within the sheath is restricted, the condition is referred to as stenosing tenosynovitis. The sufferer may be aware of a clicking or pulling sensation when trying to extend the fingers or thumb. This condition is often associated with overuse of the wrist during work activities. De Quervain’s tenosynovitis involves the abductor pollicis longus and extensor pollicis brevis tendons, which form the ‘anatomical snuffbox’, or small indent, clearly visible at the base of the thumb. Prolonged or repeated effort and unaccustomed work have been associated with the development of this condition, particularly when forceful gripping is combined with deviation of the wrist. Heavy reliance on the use of the thumb when completing an activity is also highlighted as precipitating the onset of this disorder, more so if the gripping action requires the thumb to be moved away from the main body of the hand, such as when spanning a large object with the fingers and thumb or using a tool like scissors. If the tendons of the finger flexors are compromised through overuse, the individual will be diagnosed as suffering from trigger finger. The finger flexors are responsible for closing the fingers to bring the fingertips in contact with the palm. If the tendon sheath becomes swollen, the tendon will not be able to move smoothly and will only be able to make jerky movements. This condition is often associated with overuse of the fingers and with repetitive or extended gripping of an object with a hard or sharp edge.
Work-Related III Health
Published in Céline McKeown, Office Ergonomics, 2007
If the movement of the tendon within the sheath is restricted, the condition is referred to as stenosing tenosynovitis. The sufferer may be aware of a clicking or pulling sensation when trying to extend the fingers or thumb. This condition is often associated with overuse of the wrist during work activities (Moore 1997). De Quervain’s tenosynovitis involves the abductor pollicis longus and extensor pollicis brevis tendons, which form the “anatomical snuffbox” or small indent clearly visible at the base of the thumb. Prolonged or repeated effort and unaccustomed work have been associated with the development of this condition, particularly when forceful gripping is combined with deviation of the wrist. Heavy reliance on the use of the thumb when completing an activity is also highlighted as precipitating the onset of this disorder, more so if the gripping action requires the thumb to be moved away from the main body of the hand, such as when spanning a large object with the fingers and thumb or using a tool like scissors. If the tendons of the finger flexors are compromised through overuse, the individual will be diagnosed as suffering from trigger finger. The finger flexors are responsible for closing the fingers to bring the fingertips in contact with the palm. If the tendon sheath becomes swollen, the tendon will not be able to move smoothly and will only be able to make jerky movements. This condition is often associated with overuse of the fingers and with repetitive or extended gripping of an object with a hard or sharp edge.
Tenosynovitis
Published in Richard Graveling, Ergonomics and Musculoskeletal Disorders (MSDs) in the Workplace, 2018
As noted previously, studies of ‘tenosynovitis’ frequently include a number of different disorders affecting different anatomical structures and, in some cases (such as de Quervain’s disease), possibly covering a different type of disorder altogether. Therefore, it is difficult to establish specific details of a biological mechanism to support the epidemiological evidence. Bernard (1997) refers to entrapment of the extensor pollicis brevis and abductor pollicis longus muscle tendons in de Quervain’s disease but offers no explanation as to how that entrapment develops. It is suggested that ‘over-use’ plays a role, with the rate of tissue damage exceeding the capabilities of natural repair mechanisms.
Analysis of High-Density Surface Electromyogram (HD-sEMG) signal for thumb posture classification from extrinsic forearm muscles
Published in Cogent Engineering, 2022
Muhammad Mukhlis Suhaimi, Aimi Shazwani Ghazali, Ahmad Jazlan, Naim Sidek
On the other hand, extrinsic muscles consist of various muscles that perform different functions, for example, the Flexor Pollicis Longus controls the thumb digit from the anterior side (Flexor Pollicis Longus, 2021). As for the posterior side, there are three muscles, namely, the Abductor Pollicis Longus, which controls the abduction and extension of the thumb (Physiopedia contributors, 2021), Extensor Pollicis Brevis, which is a mild abductor of the thumb (Jabir et al., 2013), and Extensor Pollicis Longus, which extends the interphalangeal joint of the thumb (Physiopedia contributors, 2021) as illustrated in Figure 3. For the transradial amputees, due to the loss of the intrinsic hand muscles, one of the options to extract the information in classifying the thumb posture is through their extrinsic muscles.