What are the possible causes of pain just above the medial malleolus, and what evaluation and treatment steps are recommended?

Pain Above the Inner Malleolus (Medial Malleolus)

If you have point tenderness directly over the medial malleolus after trauma, obtain three-view ankle radiographs (AP, lateral, and mortise) immediately—this is a positive Ottawa Ankle Rule and indicates 92-99% sensitivity for fracture 1.

Initial Evaluation Algorithm

Step 1: Apply Ottawa Ankle Rules (OAR)

The OAR determine whether imaging is needed. Radiographs are indicated if ANY of the following are present 1:

• Inability to bear weight immediately after injury OR inability to take 4 steps in the emergency department
• Point tenderness over the medial malleolus (or posterior edge/tip of lateral malleolus, talus, or calcaneus)
• Age >55 years (increases fracture risk)

Critical caveat: Do NOT use OAR in patients with neurologic disorders, peripheral neuropathy, intoxication, distracting injuries, or children <5 years old 1. In these populations, obtain radiographs regardless of examination findings.

Step 2: If OAR Negative

No imaging is needed initially 1. The patient can walk and has no point tenderness over bony landmarks. Treat conservatively with RICE protocol and functional rehabilitation.

Step 3: If OAR Positive - Obtain Radiographs

Order standard three-view ankle series (AP, lateral, mortise) 1. Weight-bearing views provide critical stability information—a medial clear space >4mm indicates instability 1.

Differential Diagnosis by Clinical Presentation

Acute Trauma Setting (Recent Injury)

Fracture patterns to consider:

• Medial malleolar fracture (most common with point tenderness)
• Stress fracture (insidious onset, athletes, often missed on initial radiographs) 2
• Deltoid ligament injury (may have medial tenderness, bruising, swelling—increases fracture/instability risk) 1

Key finding: Medial tenderness, bruising, or swelling significantly increases fracture incidence and instability 1.

Persistent Pain (>1 Week, <3 Weeks) with Negative Initial Radiographs

Order MRI or CT ankle without contrast 1. These are equivalent alternatives, but:

• MRI preferred for occult fractures, bone contusions, ligamentous injuries, and osteochondral lesions 1
• CT preferred if fracture is suspected but not visible on radiographs

MRI demonstrates 93-96% sensitivity and 100% specificity for ligamentous injuries and occult fractures 3. Delayed physical examination at 4-5 days post-injury optimizes sensitivity (84%) and specificity (96%) for ligament rupture using anterior drawer test 3.

Chronic/Overuse Pain in Athletes

Consider these sport-specific diagnoses:

1. Medial malleolar stress fracture 2, 4

   • Insidious onset, point tenderness over anterior medial malleolus
   • Standard radiographs initially negative in 100% of cases 2
   • MRI is diagnostic and shows fracture line with bone marrow edema
   • High-risk fracture requiring surgical treatment in athletes
   • Risk factors: varus alignment, cavovarus foot, excessive pronation 4

2. Traction apophysitis (children/adolescents) 5

   • Classic triad: swelling, anterior medial malleolar tenderness, pain with forced valgus
   • Seen in 25% of young basketball players 5
   • Radiographs show bilateral accessory ossification centers
   • MRI demonstrates apophyseal cartilage avulsion

3. Symptomatic ossicle/accessory ossification center 6, 7

   • Chronic pain at anterior tip of medial malleolus
   • Well-defined round bony lesion on radiographs beneath medial malleolus
   • Common in soccer players
   • May require surgical excision with deltoid ligament repair 7

Treatment Algorithm

Acute Fractures

• Supracollicular fractures: Fix surgically (28% pain rate if not fixed vs 14% if fixed, p=0.0094) 8
• Anterior collicular fractures: Consider non-operative management (only 10% report pain without surgery) 8
• Intercollicular fractures: No difference in outcomes between operative/non-operative 8

Stress Fractures in Athletes

Surgical treatment is first-line 2:

• Cannulated screw fixation or plate with bone graft
• Healing occurs in 3-4 months
• Return to pre-injury sport level in 90% of cases
• Address biomechanical factors (custom orthotics for varus alignment) to prevent recurrence 4

Symptomatic Ossicles

Surgery is first-line for prolonged symptoms (>6 months) 6:

• Arthroscopic resection with deltoid ligament repair 7
• Open reduction with bone graft for large ossicles in growing athletes 6

Common Pitfalls

1. Missing stress fractures: Standard radiographs are negative initially—obtain MRI if clinical suspicion exists 2
2. Misdiagnosing ossicles as acute fractures: Look for well-corticated margins and bilateral presence 5, 6
3. Ignoring biomechanical factors: Varus alignment and cavovarus foot increase stress fracture risk and recurrence 4
4. Premature return to sport: Stress fractures require 3-4 months healing even with surgery 2
5. Overlooking medial malleolar insufficiency: In females or patients with medial malleolus thickness <11mm at tibial component level, consider prophylactic fixation 9