The prevalence of absence of the palmaris longus muscle in the Bahraini population

Absence of the palmaris longus muscle has been well documented in several populations at a prevalence rate ranging between 2.2 and 63.9% which varies according to race, sex, and side of the body. There is little documentation of the prevalence of absence of this muscle from populations in the Arabia...

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Bibliographic Details
Published in:Clinical anatomy (New York, N.Y.) N.Y.), 2010-11, Vol.23 (8), p.956-961
Main Authors: Sater, Mai S., Dharap, Amol S., Abu-Hijleh, Marwan F.
Format: Article
Language:English
Subjects:
absence
Adolescent
Adult
Aged
Aged, 80 and over
Bahrain - epidemiology
Bahraini population
bifurcated
Child
Child, Preschool
ethnic variation
Female
Hand Deformities, Congenital - epidemiology
Hand Deformities, Congenital - ethnology
Humans
Male
Middle Aged
Muscle, Skeletal - abnormalities
palmaris longus tendon
Prevalence
Sex Characteristics
Tendons - abnormalities
wrist
Wrist - anatomy & histology
Young Adult
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Summary:Absence of the palmaris longus muscle has been well documented in several populations at a prevalence rate ranging between 2.2 and 63.9% which varies according to race, sex, and side of the body. There is little documentation of the prevalence of absence of this muscle from populations in the Arabian Gulf region. We examined 1,043 subjects, 3–85 years old, from the Kingdom of Bahrain for the presence or absence of the palmaris longus muscle using the conventional test for the presence of this muscle. Statistical analyses investigated the association of muscle absence with sex, hand dominance, and laterality. The palmaris longus muscle was absent in 36.8% of subjects. Bilateral absence (19%) was more common than unilateral absence (17.9%) with preponderance in female subjects. The muscle was absent more often on the left side than the right (P = 0.003). In the right upper limbs the muscle was absent in female subjects more than male subjects (P = 0.031). This study reaffirms that there is population variation in the frequency of absence of the palmaris longus muscle. The tendon of the palmaris longus bifurcated at the wrist in 7.1% of subjects, with male subjects showing this feature more frequently than female subjects in the right hand (P = 0.037) and the left hand (P = 0.030). This has not been reported before. The clinical significance of our findings is discussed. Clin. Anat. 23:956–961, 2010. © 2010 Wiley‐Liss, Inc.
ISSN:0897-3806
1098-2353
DOI:10.1002/ca.21034