Sagittal Band Injuries (Boxer’s Knuckle): Clinical Tests, Imaging, Classification & Differentials

Video Description

Sagittal Band Injuries (Boxer’s Knuckle): Pathogenesis, Clinical Tests, Imaging, Classification & Differentials

High-yield, student-friendly walkthrough of sagittal band injuries at the MCP joint—also known as “boxer’s knuckle.” We cover pathogenesis (traumatic, open, indirect, systemic), natural history, focused history & physical, bedside clinical tests for extensor tendon subluxation, why ulnar subluxation is common, classification (Types I–III), imaging pearls (Brewerton view, dynamic ultrasound, MRI), and key differentials (e.g., trigger finger). Includes fast exam answers and practical tips.

Chapters
Intro & learning objectives
Pathogenesis (acute, open, indirect, chronic/systemic, digit predilection)
Natural history (treated vs neglected)
History & physical (pain, swelling, motion limits, snapping)
Clinical testing for extensor tendon subluxation
Why ulnar subluxation is more common
Classification (Type I–III; “boxer’s knuckle”)
Imaging (PA/lateral/oblique, Brewerton view, dynamic US first-line, MRI when needed)
Differential diagnosis & quick comparisons (e.g., vs trigger finger)
FAQ & exam pearls (most common mechanism, systemic risks, quick tests)
Wrap-up & key takeaways

Key takeaways
• Most common mechanism: direct blow to a flexed MCP causing radial sagittal band rupture ? ulnar subluxation of the extensor tendon.
• Best first-line imaging: dynamic ultrasound; reserve MRI for ambiguity or associated soft-tissue injury.
• Chronic inflammatory disease (e.g., rheumatoid arthritis) predisposes to spontaneous rupture and ulnar drift.

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#BoxersKnuckle
#ExtensorTendon
#MCPJoint
#HandSurgery
#Orthopedics
#Musculoskeletal
#Ultrasound
#MRI
#MedicalStudents
#ExamPrep
#Trauma
#HandTherapy
#RheumatoidArthritis
#ClinicalSkills