Drop foot is a condition where you can’t lift the front part of your foot, causing it to drag along the ground when you walk. It’s not a disease on its own but a sign of an underlying nerve or muscle problem. The weakness can affect one or both feet, and depending on the cause, it can be temporary or permanent.
What Happens When You Walk
Normally, muscles along the front of your lower leg pull your foot upward with each step so your toes clear the ground. In drop foot, those muscles are too weak or paralyzed to do their job. The result is a distinctive walking pattern: you have to lift your knee unusually high, almost like you’re climbing stairs, just to keep your toes from catching on the floor. This is called a steppage gait.
Without that compensating knee lift, the foot slaps flat against the ground at each step instead of landing heel first. Toes drag, tripping becomes common, and the risk of falls goes up significantly. Over time, many people unconsciously change how they walk, swing their hip outward, or favor the other leg, which can create pain in the knee, hip, or lower back.
Common Causes
The nerve most often responsible is the peroneal nerve, which wraps around the outside of the knee just below the surface. Because it sits so close to the skin and bone there, it’s vulnerable to compression and injury. Crossing your legs for a long time, wearing a tight cast, or even sleeping in certain positions can put enough pressure on this nerve to cause temporary foot drop.
A large study of over 1,000 patients found that spinal problems are a leading contributor. About 14% of cases followed lumbar spine surgery such as laminectomy or disc fusion, and another 12% were linked to pre-existing spinal conditions like herniated discs, spinal stenosis, or degenerative changes in the lower back. These conditions can compress the nerve roots that eventually form the peroneal nerve.
Beyond spinal and peripheral nerve injuries, central nervous system conditions also cause drop foot. Stroke, multiple sclerosis, and Parkinson’s disease can all disrupt the brain’s signals to the leg muscles. Diabetes is another frequent cause because sustained high blood sugar damages peripheral nerves over time. Less commonly, tumors pressing on the nerve, hip or knee replacement surgery, or direct trauma to the leg can be responsible.
How It’s Diagnosed
A physical exam often makes the diagnosis obvious. Your doctor will ask you to walk across the room, then try to pull your foot upward against resistance. But identifying the cause requires more investigation, because treatment depends entirely on where and why the nerve signal is being interrupted.
Electromyography (EMG) and nerve conduction studies are the primary tools. EMG involves inserting a thin needle into the muscles of your lower leg to measure electrical activity. It can detect early signs of nerve damage in recent cases and track signs of healing in longer-standing ones. Nerve conduction studies send small electrical pulses along the nerve to measure how fast signals travel, helping pinpoint whether the problem is at the knee, the spine, or somewhere else along the pathway. For thorough results, multiple muscles need to be tested, including some in the back near the spine.
MRI scans of the lower leg or lumbar spine add another layer of information. Specific patterns on imaging can distinguish between peroneal nerve damage at the knee and nerve root compression higher up in the back, which is critical for choosing the right treatment.
Braces and Orthotics
An ankle-foot orthosis, or AFO, is often the first line of support. These braces fit inside your shoe and extend up the back of your calf, holding your foot at a roughly 90-degree angle so it can’t drop during walking. They restore a more normal gait almost immediately and reduce fall risk.
Several types are available, each suited to different levels of weakness. A solid AFO locks the ankle completely and works best when both the muscles that lift the foot and those that push off are affected. A posterior leaf spring orthosis is thinner and more flexible, acting like a springboard that allows slight movement at the ankle while still preventing the foot from dropping. This is a common choice when only the muscles that lift the foot are weak. A hinged AFO includes a joint at the ankle, permitting more natural movement on stairs and uneven surfaces. Your orthotist will recommend a type based on which muscles are involved and how active you are.
Carbon fiber AFOs are a newer option that stores and releases energy with each step, making walking feel less effortful. They’re lighter than traditional plastic braces and fit more easily into standard shoes.
Electrical Stimulation Devices
Functional electrical stimulation, or FES, takes a different approach. Instead of mechanically holding the foot up, a small device worn below the knee sends timed electrical pulses to the peroneal nerve, triggering the muscles to contract and lift the foot at exactly the right moment during each step. The device detects when your foot leaves the ground and activates automatically.
Research on stroke patients with drop foot has shown that FES improves walking speed, step rhythm, and endurance. In one controlled trial, patients using FES showed measurable increases in ankle strength after four weeks compared to a control group. The benefits were seen in both the number of steps needed to cover a set distance and the muscle force required to pull the foot upward. FES is particularly useful for people whose nerve pathways are intact but weakened, as with stroke or multiple sclerosis, because the electrical input can also promote motor relearning over time.
Surgical Options
When the underlying nerve damage is severe or hasn’t responded to conservative treatment, surgery may be necessary. The specific procedure depends on the type and timing of the injury.
If the peroneal nerve is being compressed, a decompression surgery (neurolysis) can release the pressure. Timing matters significantly here. Research suggests the best outcomes occur when decompression happens around five to six months after symptoms begin, and ideally within 12 months. Waiting beyond nine to ten months is associated with poorer results, because prolonged compression leads to irreversible nerve damage. In successful cases, patients have reported complete pain relief and return of normal foot function within three months of surgery, with results lasting years.
When the nerve has been cut or a section destroyed by tumor removal, nerve grafting can bridge gaps up to about 3 centimeters. For gaps too large for grafting, nerve transfers are an option: a surgeon reroutes working nerve fibers from a nearby nerve to take over the job of the damaged one. These procedures work best within the first year of foot drop.
If nerve-level surgery isn’t possible or has failed, tendon transfers offer a different solution. The most common approach reroutes the tibialis posterior tendon, a muscle on the back of the leg that normally points the foot inward, to the top of the foot. This repurposes that muscle’s pull to lift the foot instead. The tendon can be threaded between the bones of the lower leg or routed around the shin bone, then anchored to tendons on top of the foot. While tendon transfers don’t restore completely normal movement, they can eliminate the foot drag and allow walking without a brace.
Recovery Outlook
Whether drop foot resolves depends almost entirely on the cause. Compression injuries from crossing legs, a cast, or positioning during surgery often recover fully within weeks to months once the pressure is removed. Nerve fibers regenerate slowly, roughly an inch per month, so recovery from more significant damage can take many months even under ideal circumstances.
Drop foot caused by traumatic injury carries a less favorable prognosis than compression-related cases. And when the cause is a progressive neurological condition like multiple sclerosis or a severe stroke, the focus shifts from cure to long-term management with braces, FES devices, and physical therapy to maintain mobility and prevent complications like ankle stiffness or muscle contractures.
Physical therapy plays a role at every stage. Stretching the calf and Achilles tendon prevents the ankle from stiffening into a pointed-down position, which would make recovery harder even if nerve function returns. Strengthening exercises for the muscles along the front of the shin help rebuild the ability to lift the foot as nerve signals improve. Range-of-motion work keeps the ankle joint flexible. If you wear a brace, a therapist can also help you retrain your walking pattern so you rely less on the exaggerated knee lift that becomes habitual with drop foot.