The Distal Oblique Bundle in the Distal Forearm: From Anatomical Features to Clinical Implementation

Area of Science:

• Orthopedic Surgery
• Human Anatomy

Background:

• The distal oblique bundle (DOB) is the thickest component of the distal interosseous membrane (DIOM).
• Its prevalence and anatomical features are not consistently defined, leading to research disputes.
• Understanding the DOB is crucial for clinical applications, particularly in managing distal radioulnar joint (DRUJ) instability.

Purpose of the Study:

• To determine the prevalence and anatomical characteristics of the distal oblique bundle (DOB).
• To correlate findings with existing knowledge and aid clinical implementation.
• To evaluate the efficacy of DOB reconstruction techniques for DRUJ instability.

Main Methods:

• Analysis of 28 fresh-frozen forearms for DOB measurements (length, width, insertion distances).
• Prevalence determination based on a 0.5 mm thickness cutoff.
• Documentation of three cases of DOB reconstruction using the "Riggenbach" technique for DRUJ instability.

Main Results:

• DOB prevalence was 39.3% (11 out of 28 specimens).
• Mean DOB dimensions: thickness 0.88 mm, width 5.22 mm, length 25.68 mm.
• Surgical reconstruction in three patients showed significant improvement and satisfaction after a six-month follow-up.

Conclusions:

• Variations in anatomical measurements may stem from differences in specimen types, measurement techniques, and sites.
• Standardized, large-scale studies are needed for more definitive results on DOB anatomy.
• DOB reconstruction techniques offer a promising, less invasive alternative for DRUJ stabilization compared to traditional methods.