Diagnostic Approach for Finger Injuries

Initial Diagnostic Approach

The American College of Radiology recommends standard radiographs (oblique, anteroposterior, and true lateral views) for all acute finger injuries to exclude fractures and foreign bodies, followed by a systematic clinical examination to identify specific tendon and ligament injuries 1, 2
Radiographs are mandatory for any acute finger trauma, including penetrating wounds, to detect fracture fragments or foreign bodies 1, 2
The American College of Radiology suggests that delaying radiographs can compromise the reliable exclusion of fractures requiring surgery 3

The Journal of the American College of Radiology notes that mallet finger is characterized by an inability to actively extend the distal interphalangeal joint, with or without an avulsion fracture 3
The American College of Radiology recommends considering a boutonnière deformity if a central slip injury is not treated 4
The sensitivity of MRI for extensor tendon injuries varies from 28% to 85% 4
The American College of Radiology states that Jersey finger is an avulsion of the flexor digitorum profundus tendon, typically occurring during a forced gripping motion 5
MRI is ideal for evaluating the level of tendon retraction, tendon stump quality, and associated pulley injuries, with a sensitivity and specificity of 100% for Stener lesions 4, 5, 6

The American College of Radiology recommends MRI as the examination of choice when radiographs are negative but clinical suspicion of tendon or ligament injury is high, or for preoperative planning of complex injuries 1, 6
MRI has a sensitivity of 92-100% for flexor tendon injuries and can directly identify A2 and A4 pulleys in 100% of cases 4
Dynamic ultrasonography allows for direct visualization of joint misalignment and is useful for diagnosing Stener lesions and pulley system injuries 4, 6

The American College of Rheumatology suggests considering hand osteoarthritis (HOA) in adults over 40 years with chronic pain, characterized by pain with use and limited morning stiffness (<30 minutes), and typical involvement of the distal interphalangeal joints, proximal interphalangeal joints, base of the thumb, and index and middle finger metacarpophalangeal joints 7, 8
A confident clinical diagnosis of HOA can be made in adults over 40 years with these typical characteristics 7, 8

The American College of Radiology advises against removing the splint in mallet finger cases, even briefly, as this can restart the healing process 3
Initial management should involve ice/cold therapy rather than heat to control pain and swelling 3
Manual reduction of the finger should not be attempted before splinting 3
The American College of Radiology recommends immediate referral for surgical evaluation in cases of mallet finger with fractures involving ≥1/3 of the articular surface, palmar subluxation of the distal phalanx, or interfragmentary gap >3mm 3
All Jersey finger injuries require surgical treatment, ideally within 10 days 5
Stener lesions require surgical reduction due to interposition of the adductor aponeurosis 4, 6

For any acute finger injury (including penetrating wounds), obtain immediate standard radiographs—oblique, anteroposterior, and true lateral views—before any manipulation to rule out fractures, dislocations, and foreign bodies, and then perform a systematic clinical exam to identify tendon and ligament injuries. (American College of Radiology) 9
The three standard views (oblique, AP, true lateral) are sufficient for the majority of acute finger lesions. (American College of Radiology) 9

In cases of suspected jersey‑finger (deep flexor tendon avulsion), MRI is valuable for assessing tendon retraction level, quality of the tendon stump, and associated pulley injuries. (American College of Radiology) 9

When initial radiographs are negative but clinical suspicion for a radiopaque foreign body remains, a CT scan of the area provides high sensitivity (≈63 %) and very high specificity (≈98 %) for detecting such objects. (American College of Radiology) 9
CT is superior to MRI for identifying fresh, water‑rich wood fragments. (American College of Radiology) 9
Ultrasound offers improved localization of radiopaque foreign bodies and can guide their removal. (American College of Radiology) 9