Peripheral Arterial Disease and the Foot: Circulation, Wounds, and Limb Preservation

Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.

What Is Peripheral Arterial Disease?

Peripheral arterial disease (PAD) is a condition in which atherosclerosis — the buildup of cholesterol plaques within arterial walls — progressively narrows the arteries supplying blood to the lower extremities. As arterial diameter narrows, blood flow to the legs and feet is reduced, leading to a spectrum of symptoms from exercise-induced leg cramping to severe rest pain, non-healing wounds, and tissue death (gangrene). PAD affects approximately 8–10 million Americans, with significantly higher prevalence in diabetics, smokers, and older adults.

The foot is at the end of the arterial circulation — the first place to show the consequences of reduced blood flow. Podiatrists are frequently the first clinicians to identify signs of PAD during routine foot examination and play a critical role in initiating appropriate vascular workup and coordinating care with vascular surgeons.

Risk Factors and Who Gets PAD

The major modifiable risk factors for PAD mirror those for coronary artery disease: cigarette smoking (the single strongest risk factor — smokers have 4 times the PAD risk of non-smokers), diabetes mellitus, hypertension, hyperlipidemia, and obesity. Non-modifiable risk factors include increasing age (prevalence rises substantially after age 65), male sex (higher prevalence in men), and family history. PAD is a marker of systemic atherosclerosis — people with lower extremity PAD have significantly elevated risks of heart attack and stroke.

Symptoms: From Claudication to Critical Limb Ischemia

PAD produces symptoms in a spectrum of severity:

Intermittent claudication is the hallmark early symptom — cramping, aching, or fatigue in the calf, thigh, or buttock that occurs with walking at a reproducible distance and is relieved within minutes of rest. The cramping is caused by inadequate blood flow to meet the muscular oxygen demand of exercise. Claudication typically develops when arterial stenosis exceeds 50–70% of the vessel diameter.

Rest pain — pain in the foot or toes at rest, particularly at night when the leg is elevated and gravity no longer assists blood flow distally — indicates critical limb ischemia (CLI), a more severe stage of PAD where tissue perfusion is insufficient even without the additional demand of exercise. Rest pain characteristically improves by dangling the foot below the level of the heart.

Critical limb ischemia manifests as rest pain, non-healing ulcers, or tissue death (gangrene). CLI represents the most severe form of PAD and carries a high risk of major amputation (30% within one year) and death. Urgent vascular intervention — angioplasty, stenting, or bypass surgery — is required to restore perfusion and preserve the limb.

Physical Signs of PAD in the Foot

During a podiatric examination, signs of PAD include: diminished or absent dorsalis pedis and posterior tibial pulses (the pulses felt on the top and inner ankle of a normal foot), hairless, shiny, thin atrophic skin on the lower leg and foot, thickened brittle toenails from chronic ischemia, pallor of the foot on elevation with dependent rubor (redness when the foot is lowered below the heart), and slow capillary refill (greater than 3 seconds when a toenail is pressed and released). Wounds on ischemic feet have distinctive characteristics: they tend to be dry, punched-out, minimally painful (in the absence of neuropathy), and located on the tips of the toes, the heel, and over bony prominences — areas where pressure concentrates.

Diagnosis: The Ankle-Brachial Index and Beyond

The ankle-brachial index (ABI) is the primary screening test for PAD — a simple non-invasive test performed in the office by measuring systolic blood pressure at the ankle and the arm with Doppler ultrasound. A normal ABI is 1.0–1.4; values below 0.9 indicate PAD, and values below 0.5 indicate severe disease. Calcified arteries in diabetics can produce falsely elevated ABI values (above 1.4), requiring alternative tests like toe-brachial index or transcutaneous oxygen pressure (TcPO2). CT angiography and catheter angiography provide detailed arterial mapping for pre-procedural planning.

Wound Care and Limb Preservation

Non-healing wounds in the setting of PAD require a coordinated team approach. Podiatry provides wound debridement, off-loading, dressing selection, and infection management. Vascular surgery or interventional radiology addresses the underlying arterial obstruction through angioplasty, stenting, or bypass procedures. Optimizing blood sugar in diabetics (HbA1c below 7.5%), stopping smoking, and managing cardiovascular risk factors are essential systemic interventions. The goal is limb preservation — avoiding major amputation — which dramatically impacts quality of life, functional independence, and mortality.

When to Seek Evaluation

See your podiatrist if you experience leg cramping that occurs at a predictable walking distance and resolves with rest, foot pain at night that is relieved by dangling the foot, wounds on the foot or toes that are not healing, or discoloration and coldness of the feet. These symptoms suggest PAD and warrant ABI testing and possible vascular referral. Earlier diagnosis and intervention — before critical limb ischemia develops — produces dramatically better outcomes.

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Balance Foot & Ankle — Howell & Bloomfield Township, MI

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Peripheral Arterial Disease & Foot Care

Poor circulation from PAD threatens limb health and can lead to non-healing wounds. Our podiatrists at Balance Foot & Ankle provide vascular assessment and wound management at our Howell and Bloomfield Hills offices.

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Clinical References

1. Hirsch AT, et al. “ACC/AHA 2005 Practice Guidelines for the management of patients with peripheral arterial disease.” Circulation. 2006;113(11):e463-e654.
2. Marston WA, et al. “Natural history of limbs with arterial insufficiency and chronic ulceration treated without revascularization.” J Vasc Surg. 2006;44(1):108-114.
3. Armstrong DG, et al. “Diabetic foot ulcers and their recurrence.” N Engl J Med. 2017;376(24):2367-2375.