Hi Sue,

This may have nothing to do with it at all; you asked for ideas so take a look at this:
http://www.emedicine.com/PMR/topic60.htm
Ischemic Monomelic Neuropathy

Here's a few extracts:

Background: Ischemic monomelic neuropathy (IMN) is an infrequent problem that usually occurs after acute arterial occlusion or low blood flow to an extremity. This condition can occur after surgical procedures (eg, vascular surgery involving the thoracoabdominal aorta and its caudal arterial channels), arteriovenous fistulas for hemodialysis assess, arterial emboli, or thrombi.

* Physical examination of the leg frequently shows decreased sensation in the foot and distal calf. Allodynia and hyperesthesia also may be present. Intrinsic wasting in the feet is usually present. Distal leg muscles also can be weak, including extensor hallucis longus, anterior tibialis, peroneus longus, and gastrocnemius/soleus. Hamstrings, quadriceps, and hip abductors are affected in rare cases. Gait may be abnormal in that the patient may have steppage gait associated with ankle dorsiflexion weakness (foot drop). Reflexes may be asymmetric, especially at the ankle, with an absent Achilles reflex in the affected leg.

* In cases of chronic disuse, contractures of the distal joints (fingers, toes, wrists, or ankles) with swelling, skin atrophy, and vasomotor changes can be present. These conditions can coexist with complex regional pain syndrome (CRPS) type 2 (also known as reflex sympathetic dystrophy [RSD]).

* Patients with chronic IMN most commonly have hypalgesia in their distal foot and toes and/or nonhealing skin ulcers.

Just a thought, I hope someone can help you very soon,
all the best