Related Subjects: Type 1 DM
|Type 2 DM
|Diabetes in Pregnancy
|HbA1c
|Diabetic Ketoacidosis (DKA) Adults
|Hyperglycaemic Hyperosmolar State (HHS)
|Diabetic Nephropathy
|Diabetic Retinopathy
|Diabetic Neuropathy
|Diabetic Amyotrophy
|Maturity Onset Diabetes of the Young (MODY)
⚡ Cardinal symptoms: abrupt or subacute onset of severe proximal leg pain (thigh, hip, buttock, or back), followed within days to weeks by progressive weakness and muscle wasting.
📖 About
- Also called diabetic amyotrophy or diabetic lumbosacral radiculoplexus neuropathy (DLRPN).
- A rare neurological complication of diabetes, usually affecting older adults with Type 2 diabetes.
- Typically presents with pain first, then asymmetrical proximal weakness.
- Mainstay of management: optimise glycaemic control, treat neuropathic pain, provide physiotherapy, and seek neurology input.
📊 Epidemiology
- 📉 Uncommon, but probably under-recognised.
- 👵 Most often seen in middle-aged or older adults with diabetes.
- 🩺 May occasionally be the presenting feature of previously undiagnosed diabetes.
🧬 Aetiology / Pathophysiology
- 🧠 Believed to be a predominantly ischaemic-inflammatory neuropathy affecting the lumbosacral roots, plexus, and proximal nerves.
- 🩸 Endoneurial microvasculitis and impaired perfusion lead to axonal injury.
- ⚠️ This explains the combination of severe pain, weakness, wasting, and often a prolonged recovery.
🩺 Clinical Features
- 👤 Typical age: >50 years.
- 💥 Severe unilateral thigh/hip/buttock pain, often spreading over time.
- 🦵 Asymmetrical proximal weakness affecting quadriceps, hip flexors, and adductors.
- 📉 Muscle wasting develops over weeks.
- 🔥 Pain usually precedes weakness and is often very disabling.
- 🧦 Mild sensory symptoms may coexist, especially if there is background diabetic peripheral neuropathy.
- 🦶 Reduced or absent knee jerk; ankle jerks may be preserved unless distal polyneuropathy is also present.
- ⏳ Recovery is usually slow, often over months, and may be incomplete.
🧾 Differential Diagnosis
- 🚨 Cauda equina syndrome.
- 🦴 Lumbar root compression or spinal canal stenosis.
- 🧠 Guillain-Barré syndrome / CIDP.
- 🎗️ Neoplastic lumbosacral plexopathy.
- 🦿 Femoral neuropathy.
- 💪 Myopathy or motor neurone disease, depending on the pattern.
🔎 Investigations
- 🧪 HbA1c / blood glucose and general diabetes assessment.
- 🩸 Check B12, folate, and other bloods if mimics are possible.
- ⚡ EMG and nerve conduction studies to support the diagnosis and help exclude alternative neuropathies.
- 🖥️ MRI lumbosacral spine if structural causes such as disc disease, stenosis, or tumour need exclusion.
- 💉 Lumbar puncture only if an inflammatory neuropathy such as GBS/CIDP is suspected and clinically appropriate.
- 👩⚕️ Consider further imaging or specialist tests if red flags suggest malignancy, infection, or another neuromuscular disorder.
🛠️ Management
- 🍬 Optimise glycaemic control.
- 💊 Treat pain according to neuropathic pain guidance.
- 🏋️ Physiotherapy, mobility support, and falls prevention.
- 🩼 Consider walking aids and rehabilitation if weakness is functionally limiting.
- 👩⚕️ Neurology referral if diagnosis is uncertain, weakness is progressive, or alternative pathology is possible.
- 🧘 Supportive care is important, as recovery is often prolonged and psychologically frustrating for patients.
💊 Neuropathic Pain Options
- 💡 NICE recommends offering one of the following as initial treatment for neuropathic pain in adults: amitriptyline, duloxetine, gabapentin, or pregabalin.
- 🔄 If the first option is ineffective or not tolerated, another first-line option can be tried.
📚 References
