Why does my foot drop or drag when I walk?
Foot drop refers to weakness in lifting the front part of the foot — patients often notice the toe catching on the floor, a slapping sound when walking, or having to lift the leg higher to clear the ground. From a spine surgeon's perspective, the most common cause is compression of the L5 nerve root in the lower back, frequently from a disc herniation at the L4–L5 level. The L5 nerve supplies the tibialis anterior muscle, which is responsible for lifting the foot.
Foot drop, however, is not always caused by a spinal problem. Compression of the peroneal nerve as it passes around the outside of the knee — sometimes from prolonged leg crossing, tight casts, or rapid weight loss — can produce a very similar pattern of weakness. Peripheral neuropathies, particularly in patients with diabetes, can also weaken the muscles that lift the foot. Less commonly, the cause may be a stroke or a motor neuron disorder.
The distinction matters because treatment differs entirely. A spinal cause typically presents with associated low back pain, leg pain radiating in an L5 distribution along the outer calf to the top of the foot, and sometimes numbness in the same area. A peroneal nerve cause usually has no back pain and a more localized sensory change. An MRI of the lumbar spine and a careful neurological examination are usually sufficient to determine the source.
Timing of evaluation is important. Foot drop that develops rapidly, worsens over days, or occurs together with bladder or bowel changes warrants urgent evaluation. Recovery of motor strength after nerve compression is most likely when the compression is relieved early; prolonged severe weakness tends to recover less completely even after successful decompression. If foot drop appears, it should be assessed by a spine specialist or neurologist rather than waiting to see if it improves on its own.
- Is arm tingling always caused by a cervical disc problem?
Not necessarily. While cervical disc herniation is a common cause and typically follows a dermatomal pattern (e.g., C6 affects the thumb and index finger), other conditions — peripheral neuropathy, carpal tunnel syndrome, vascular insufficiency, thoracic outlet syndrome — can produce similar symptoms.
- When is cervical disc surgery indicated?
Surgery is generally considered after conservative treatment fails (typically 6–12 weeks) or when specific neurological findings appear — progressive motor weakness, signs of myelopathy, bowel/bladder dysfunction, or severe intractable pain.
- Why does my leg go numb? Could it be from my back?
Numbness in the leg can indeed come from a problem in the lower back. The most common cause is compression of a spinal nerve root by a herniated disc or by narrowing of the spinal canal. Other causes — diabetes-related nerve damage, vascular issues, or nerve entrapment outside the spine — can produce similar symptoms, so the pattern of numbness matters.
This page provides general information for educational purposes and does not substitute for individual clinical judgment. For symptoms or conditions that concern you, please consult a qualified spine specialist.