Diagnostic Approach for Upper Leg Pain

Initial Assessment

The American College of Cardiology recommends beginning with a focused vascular assessment, including resting ankle-brachial index (ABI) measurement, to establish or exclude peripheral artery disease (PAD) as this represents the most critical life-threatening cause of leg pain that requires immediate identification 1
Pain pattern assessment is crucial, and the American College of Cardiology suggests determining if pain occurs predictably with walking a certain distance and resolves within 10 minutes of rest, which indicates vascular claudication 2, 3
The American College of Cardiology also recommends assessing for bilateral buttock and posterior thigh pain that worsens with standing or spinal extension and improves with sitting or lumbar flexion, suggesting spinal stenosis 4
Evaluating for aching discomfort in lateral hip/thigh after variable exercise that is not quickly relieved by rest, indicating hip arthritis, is also recommended by the American College of Cardiology 3
Documenting if pain is sharp and lancinating, radiating down the leg, worse with sitting, suggesting nerve root compression, is advised by the American College of Cardiology 3

The American College of Cardiology suggests documenting age ≥65 years, or age 50-64 years with diabetes, smoking history, dyslipidemia, hypertension, chronic kidney disease, or family history of PAD 3
Assessing for known atherosclerotic disease in other vascular beds (coronary, carotid, renal) is recommended by the American College of Cardiology 3

The American College of Cardiology recommends palpating femoral, popliteal, dorsalis pedis, and posterior tibial pulses bilaterally, rating as 0 (absent), 1 (diminished), 2 (normal), or 3 (bounding) 2, 3
Auscultating for femoral bruits is advised by the American College of Cardiology 2, 3
Inspecting for nonhealing wounds, gangrene, asymmetric hair growth, nail bed changes, calf muscle atrophy, or elevation pallor/dependent rubor is recommended by the American College of Cardiology 3

The American College of Cardiology suggests obtaining resting ABI with or without segmental pressures and waveforms as the initial test for all patients with suspected PAD 2, 3, 1
Interpreting ABI results: ≤0.90 = Abnormal (PAD confirmed), 0.91-0.99 = Borderline, 1.00-1.40 = Normal, >1.40 = Noncompressible arteries, is recommended by the American College of Cardiology 2, 3, 1
If ABI >1.40 (noncompressible): Measuring toe-brachial index (TBI) to diagnose PAD is advised by the American College of Cardiology and Circulation 2, 5, 1
If ABI normal or borderline (>0.90 and ≤1.40) with persistent exertional leg symptoms: Performing exercise treadmill ABI testing is recommended by the American College of Cardiology and Circulation 2, 5, 1

The American College of Cardiology recommends not relying on ABI alone in diabetic patients and those with chronic kidney disease due to the high incidence of noncompressible arteries; obtaining TBI is advised 1
Patients with diabetes and critical limb ischemia may have no pain due to neuropathy but still have severe tissue loss requiring urgent evaluation, according to the American College of Cardiology and Journal of the American College of Cardiology 6, 1
The American College of Cardiology suggests that patients at risk for critical limb ischemia (ABI <0.4 in non-diabetic, or any diabetic with known PAD) who develop acute limb symptoms represent vascular emergencies and require immediate assessment by a vascular specialist 6, 1