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Sonographic imaging of mallet finger
Y Kleinbaum1, Z Heyman, A Ganel
1Department of Diagnostic Imaging, Sheba Medical Center, Israel.
Ultraschall in Der Medizin (Stuttgart, Germany : 1980)
|June 11, 2005
Summary
Ultrasound effectively diagnoses mallet finger, a common finger deformity. It identifies key signs like tendon tears and fractures, distinguishing traumatic injuries from arthritis-related conditions.
Area of Science:
- Orthopedics
- Radiology
- Musculoskeletal Imaging
Background:
- Mallet finger presents as a flexion deformity of the distal interphalangeal joint (DIPJ).
- It results from disruptions in the extensor mechanism, often due to trauma or conditions like rheumatoid arthritis or osteoarthritis.
Purpose of the Study:
- To detail the sonographic findings characteristic of mallet finger.
- To evaluate ultrasound's utility in differentiating traumatic mallet finger from other flexion deformities.
Main Methods:
- Sonographic examinations were conducted on 30 patients with traumatic mallet finger.
- Control groups included 30 individuals with examinations of the contralateral hand and 30 patients with flexion deformities due to rheumatoid arthritis or osteoarthritis.
Main Results:
- Four key sonographic criteria for traumatic mallet finger were identified:
- Discontinuity of the extensor tendon (partial or complete tear), avulsion fracture, lack of real-time extensor tendon movement, and fluid at the extensor tendon insertion site.
Conclusions:
- Sonographic examination is a valuable diagnostic tool for traumatic mallet finger.
- Ultrasound can effectively differentiate traumatic mallet finger from flexion deformities caused by rheumatoid arthritis or osteoarthritis.
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