Junctura tendinum between extensor digitorum communis and extensor pollicis longus.

Area of Science:

• Anatomy
• Orthopedics
• Human Morphology

Background:

• Juncturae tendinum are common fibrous connections between finger extensor tendons.
• These connections typically do not impede independent finger extension.
• Anatomical variations in the extensor mechanism can affect hand function.

Observation:

• A 34-year-old woman presented with an incidental finding of a junctura tendinum.
• This tendinous interconnection was located between the extensor digitorum communis of the index finger and the extensor pollicis longus.
• The anomaly was noted during a routine examination.

Findings:

• The identified junctura tendinum did not represent a supernumerary muscle.
• The patient exhibited a lack of independent extension of the thumb and fingers in both hands.
• This suggests the anomaly may be bilateral and functionally significant.

Implications:

• This case reports a novel anatomical variant in the extensor tendons of the hand.
• The finding highlights a potential cause for impaired independent digital extension.
• Further research may explore the prevalence and functional impact of such tendinous interconnections.