Ulnar tunnel syndrome, also called Guyon’s canal syndrome, is a condition where the ulnar nerve becomes compressed as it passes through Guyon’s canal, a narrow passageway in the wrist near the base of the palm. This nerve is responsible for sensation in the ring and little fingers and helps control fine motor movements of the hand. When the nerve is compressed in this area, it can lead to symptoms such as tingling, numbness, or a “pins and needles” feeling in those fingers. In some cases, people may experience hand weakness, especially when
gripping or spreading the fingers.
The condition can develop due to repetitive hand movements, pressure on the wrist (like from cycling or leaning on the palm), wrist trauma, or space-occupying lesions such as ganglion cysts. Unlike cubital tunnel syndrome, which affects the ulnar nerve at the elbow, ulnar tunnel syndrome specifically involves nerve compression at the wrist level. Over time, if the pressure continues, the symptoms may worsen, potentially leading to hand muscle wasting, reduced coordination, and long-term functional impairments. Early recognition of the symptoms is important to avoid progression.
