Review on Injuries to the Sagittal Bands Introduction The sagittal bands are one of the components of the dorsal hood , which is the support structure for the extensor tendon at the level of the dorsal...
Review on Injuries to the Sagittal Bands The sagittal bands are one of the components of the dorsal hood , which is the support structure for the extensor tendon at the level of the dorsal metacarpophalangeal joint (MCP). The other structures that make up the dorsal hood are the oblique and transverse bands. The sagittal bands are the thickest structures of the extensor hood and act as the main resistance for proximal displacement of the extensor tendon.
Intact sagittal bands will prevent radial-ulnar subluxation of the extensor tendon and also aid in MCP extension (2, 3). The sagittal bands are broken into a superficial and deep layer that allows the tendon to run through the bands. The sagittal bands will form a sling around the tendon and then attach to the volar plate.
Injury to the sagittal bands are typically seen in boxer’s knuckle, which is defined as a tear of the MCP joint capsule that usually is accompanied by a rupture of the sagittal bands. The third MCP is most typically affected in a boxer’s knuckle. White arrows represent the fibers of the sagittal bands Diagnosis Injury to the sagittal bands can be acute or chronic.
A blunt trauma to the MCP joint can cause partial tear or complete rupture of the sagittal bands. Even low energy activities, like flicking the finger, can cause acute injury to the sagittal bands. Patients will typically complain of extensor tendon instability.
They also may complain of a snapping localized to the MCP joint. On physical exam, the provider should evaluate for tendon subluxation and dislocation with flexion and extension of the affected MCP joint. The tendon will typically subluxate in the ulnar direction with flexion of the MCP joint.
If you are experiencing symptoms that may be related to review on injury to the sagittal bands, it is important to see a sports medicine physician. Early evaluation and treatment typically lead to better outcomes. Do not ignore pain or symptoms that are limiting your activity.
*This article is for educational purposes only and does not substitute for professional medical advice. Always consult a qualified healthcare provider.*
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