Prevalence of the Linburg–Comstock variation through clinical evaluation

Introduction Linburg–Comstock variation, the tendinous interconnection between flexor pollicis longus and flexor digitorum profundus, is known to have a wide frequency range. Its prevalence is reported with a range of 13–66%. The aim of the study was to assess this variation in general population an...

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Published in:	Surgical and radiologic anatomy (English ed.) Vol. 41; no. 11; pp. 1307 - 1314
Main Authors:	Erić, Mirela, Yammine, Kaissar, Gosh, Vipin, Feigl, Georg, Marić, Dušica
Format:	Journal Article
Language:	English
Published:	Paris Springer Paris 01-11-2019 Springer Nature B.V
Subjects:	Adolescent Anatomic Variation Anatomy Female Females Fingers Forearm Gender Hand Deformities, Congenital - diagnosis Hand Deformities, Congenital - epidemiology Humans Imaging Magnetic Resonance Imaging Male Medicine Medicine & Public Health Muscle, Skeletal - abnormalities Muscle, Skeletal - diagnostic imaging Original Article Orthopedics Prevalence Prospective Studies Radiology Sex Factors Statistical analysis Surgery Syndrome Tendons - abnormalities Tendons - diagnostic imaging Variation Young Adult Flexor pollicis longus Linburg–Comstock variation Flexor digitorum profundus Hand
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Summary:	Introduction Linburg–Comstock variation, the tendinous interconnection between flexor pollicis longus and flexor digitorum profundus, is known to have a wide frequency range. Its prevalence is reported with a range of 13–66%. The aim of the study was to assess this variation in general population and to correlate it with gender and side. Material and methods This prospective study included 215 subjects (82 males and 133 females). Two clinical tests were conducted to diagnose the variation and to detect any related symptomatology. The primary outcome was set to be the prevalence of Linburg–Comstock variation. Secondary outcomes were defined as gender-based prevalence, side-based prevalence, and Linburg–Comstock variation prevalence association with gender and side. Results Linburg–Comstock variation was clinically diagnosed in 130 (60.47%) participants. Unilateral and bilateral prevalence were of 17.21% and 43.26%, respectively, yielding a statistically significant difference. Right-sided and left-sided presence were calculated at 7.44% and 9.77%. Bilateral prevalence was statistically more common in females. Right-sided variation was found to be more frequent in males while left-sided variation was more prevalent in females. The index finger was the most commonly involved with prevalence of 91.03%. Symmetry was noted in 67.74% of subjects. Conclusion The results of our study demonstrated a relatively high prevalence of the Linburg–Comstock variation in Serbian population. We noted a few unusual cases and this finding point to the existence of the broader spectrum of Linburg–Comstock variation, and complexity of the flexor apparatus of the hand, so, further investigations about this topic are needed to improve our knowledge. Due to the possibility of false-positive result during clinical testing we suggest to use expanded clinical method.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0930-1038 1279-8517
DOI:	10.1007/s00276-019-02265-0