Patient information
Double crush syndrome and carpal tunnel
Tingling, numbness or weakness in a hand can come from the wrist, the neck or more than one place. Understanding which problems are contributing helps guide treatment and set realistic expectations.
What is double crush syndrome?
Double crush syndrome describes nerve problems at more than one point along the same nerve pathway. One example is a compressed nerve root in the neck alongside carpal tunnel syndrome at the wrist.
Carpal tunnel syndrome can occur on its own. Having both conditions does not prove that one caused the other. The mechanisms behind double crush remain debated, and there is no single agreed test or diagnostic definition.
Are symptoms coming from the neck or wrist?
Carpal tunnel syndrome involves pressure on the median nerve at the wrist. Tingling or numbness often affects the thumb, index and middle fingers and the thumb-side half of the ring finger. Symptoms commonly disturb sleep; hand weakness can also develop.
A compressed nerve root in the neck, called cervical radiculopathy, may cause pain travelling into the shoulder or arm, altered sensation or weakness. Neck movements can change these symptoms. The patterns can overlap, so symptoms alone do not reliably identify every cause.
How is it assessed?
Assessment brings together your symptom pattern, medical history and examination of the neck, arms and hands. Strength, sensation and reflexes help identify where a nerve may be affected.
Carpal tunnel can often be diagnosed clinically. Nerve conduction studies and electromyography may help when the diagnosis is unclear or more than one site is suspected. Neck imaging is considered when the findings warrant it; a scan finding must fit the clinical picture.
Planning treatment
For carpal tunnel, options may include a wrist splint at night, adjusting activities and sometimes an injection. Surgery may be considered for persistent or severe symptoms or nerve damage. Dr Baecker also performs carpal tunnel release surgery. Neck treatment depends on the examination and any relevant investigations.
When both sites contribute, treatment should address the problems identified. Dr Baecker can discuss treatment options for both the neck and wrist. Treating one site may leave symptoms from the other; two diagnoses do not automatically mean two operations. Discuss which treatment to try first and what improvement to expect.
When to seek urgent help
New or worsening hand clumsiness, balance problems or limb weakness needs prompt medical assessment. Sudden or rapidly worsening weakness, difficulty walking, or new bladder or bowel dysfunction needs urgent care. Go to an emergency department; call 111 if you need emergency assistance. Do not wait for a reply to an online consultation request.
Questions to discuss
- Which findings point to the wrist and which to the neck?
- Would nerve tests or imaging change my treatment?
- Which problem should be treated first, and what symptoms might remain?
Arrange a consultation
Dr Baecker consults at Domain Orthopaedic Surgeons in Parnell, Auckland. Self-referrals are welcome.