Differential Diagnosis for Calf Pain and Limited Mobility
The patient's symptoms of a "pop" in the calf, inability to walk normally, and pain localized to the calf suggest a musculoskeletal issue. Here's a categorized differential diagnosis:
Single Most Likely Diagnosis
- Achilles Tendon Rupture: This is the most likely diagnosis given the sudden onset of pain and the characteristic "pop" sound, which is often reported by patients who experience an Achilles tendon rupture. The inability to walk normally and pain in the calf further support this diagnosis.
Other Likely Diagnoses
- Calf Strain: A strain in the muscles of the calf could cause pain and limit mobility, although it might not typically cause a "pop" sound.
- Gastrocnemius or Soleus Muscle Tear: Tears in these muscles could present with similar symptoms, including pain and difficulty walking.
- Deep Vein Thrombosis (DVT): While DVT might not cause a "pop," it can lead to calf pain and swelling, and could potentially limit mobility due to pain.
Do Not Miss Diagnoses
- Compartment Syndrome: This is a medical emergency that could present with severe pain, especially on palpation, and limited mobility. It's crucial to consider this diagnosis due to its potential for serious complications if not promptly treated.
- Popliteal Artery Aneurysm or Embolism: Although less common, these vascular issues could cause acute leg pain and necessitate urgent intervention.
Rare Diagnoses
- Rupture of the Plantaris Tendon: This tendon is small and not always present, but its rupture can mimic an Achilles tendon rupture in terms of the "pop" sound and subsequent pain.
- Tumor or Cyst: A soft tissue tumor or cyst in the calf could cause pain and limit mobility, but this would be less likely to cause a sudden "pop" sound.
- Infection (e.g., Cellulitis or Abscess): While infections can cause pain and swelling, they are less likely to cause a sudden "pop" and would typically be accompanied by other signs of infection such as redness, warmth, and fever.