A patient who fell off a bike one month ago with a possible fall on an outstretched hand (FOOSH) now has snuff‑box tenderness, wrist pain, and pain radiating up the arm; what is the appropriate evaluation and management?

Evaluation and Management of Delayed FOOSH Injury with Snuffbox Tenderness

This patient requires immediate advanced imaging with MRI or CT to rule out an occult scaphoid fracture or nonunion, as the one-month delay with persistent snuffbox tenderness strongly suggests a missed scaphoid fracture that may have progressed to nonunion or avascular necrosis.

Clinical Significance of Delayed Presentation

The combination of FOOSH mechanism, anatomic snuffbox tenderness, and one-month delay creates a high-risk scenario for serious complications:

• Scaphoid fractures are missed on initial radiographs in up to 30% of cases 1, and the misdiagnosis rate for scaphoid fractures can be as high as 43.8% 2
• Delayed diagnosis leads to functional impairment 3, with risk of progression to nonunion and avascular necrosis
• Patients with spontaneous or vague history of wrist trauma and persistent pain may be suffering from carpal bone nonunion or avascular necrosis 4

Immediate Diagnostic Approach

Advanced Imaging is Now Required

Given the one-month delay, standard radiographic follow-up is insufficient:

MRI without IV contrast is the preferred modality because it:

• Detects occult fractures of the distal radius and carpal bones 3
• Evaluates for concomitant ligamentous injuries (scapholunate ligament tears) that may affect surgical management 3
• Led to a change in diagnosis in 55% of patients and change in management in 66% when initial radiographs were negative 3

CT without IV contrast is an alternative that:

• Excludes occult fractures of the upper extremity 3
• Is particularly useful for diagnosing injuries difficult to recognize on radiographs, such as carpometacarpal joint fracture-dislocations 3
• Cannot evaluate ligamentous injuries unlike MRI 3

If Initial Radiographs Were Never Obtained

Three-view wrist radiography should still be performed (posteroanterior, lateral, and 45° semipronated oblique) 3, though at one month post-injury, radiographs may now show:

• Fracture line that has become more apparent
• Signs of nonunion
• Early avascular necrosis changes

Key Clinical Examination Findings

The anatomic snuffbox tenderness is highly significant:

• Snuffbox tenderness has 100% sensitivity for scaphoid and ligamentous lesions in general 5
• Pain radiating up the arm suggests possible associated injuries or complications
• The history of hyperflexion injury should alert for scaphoid tubercle fracture 5

Management Based on Imaging Results

If Scaphoid Fracture/Nonunion Confirmed:

Urgent orthopedic referral is mandatory because:

• Operative fixation with cannulated screws may be required for nonunion 2
• Early scaphoid fractures can be managed with plaster cast if diagnosed promptly 2
• At one month, the window for conservative management may have closed

If Ligamentous Injury Identified:

• Scapholunate ligament tears affect surgical treatment decisions 3
• May require arthroscopic evaluation and repair

Critical Pitfalls to Avoid

The main causes of scaphoid fracture misdiagnosis are 2:

• Nonspecific symptoms at early stage
• Combination with other injuries
• Lack of knowledge about the injury pattern
• Ignorance of further examination needs

Do not repeat the initial error of relying solely on clinical examination or basic radiographs at this delayed presentation 2. The one-month delay has already placed this patient at risk for permanent complications.

Prognosis Considerations

• Delayed diagnosis significantly impacts outcomes - in one study, both cases with chronic pain and declining wrist mobility were in the misdiagnosed group 2
• Operative fixation resulting in <2mm residual articular surface step-off is necessary to avoid long-term complications such as osteoarthritis 3