Hereditary Spastic Paraplegia (HSP) Treatment: How Long-Term Care for Stiff Legs Is Planned

The first sign was a scuffed toe on the right shoe. Then the other shoe. A man in his forties who had run half-marathons found himself catching curbs, then stairs, then the edge of his own rug. His legs were not weak exactly; they felt wound tight, like a spring that would not fully release. Eighteen months of appointments later, a neurologist said three words he had never heard: hereditary spastic paraplegia.

What most people want to know next is not the genetics. It is what happens now. Hereditary spastic paraplegia treatment is not a single prescription or a procedure with a date on the calendar. It is a plan, built in layers, that gets adjusted for years.

This article walks through how that plan is usually put together, what each layer does, why some people are asked to wait before adding medicines, and which changes should send you back to your care team promptly.

What does hereditary spastic paraplegia treatment actually involve?

Hereditary spastic paraplegia (HSP) is a group of inherited conditions in which the long nerve fibers running from the brain down the spinal cord to the legs gradually degenerate. The result is a slowly progressive mix of leg stiffness and weakness. The honest starting point for treatment is this: according to the NIH’s National Institute of Neurological Disorders and Stroke (NINDS), no therapy is currently known to prevent, slow or reverse that degeneration. Everything a care team offers is aimed at the consequences, not the cause.

That sounds discouraging until you see how much the consequences can be shaped. Spasticity, the medical term for muscles that are stiff and resist being stretched because the nerve signals that normally relax them are damaged, is highly treatable as a symptom. So are bladder urgency, foot positioning problems, fatigue and pain, all of which commonly travel with HSP.

A typical plan therefore has three moving parts. The first is movement-based care: physiotherapy, daily stretching and strength work, which the NHS and NINDS both describe as the foundation. The second is medicine, added when stiffness interferes with walking, sleep or comfort despite that foundation. The third is equipment and environment: ankle braces, walking poles, footwear, home adjustments.

The team is usually coordinated by a neurologist, with physiotherapists and occupational therapists doing most of the hands-on work, and a urologist, orthotist, genetic counselor or rehabilitation physician joining as needed. Because HSP changes over years rather than weeks, the plan is reviewed at intervals, often every six to twelve months in stable adults, more often when something is shifting. What is added, adjusted or withdrawn is always a decision for the treating team based on how the individual is functioning.

Why do the legs stiffen in HSP? The mechanism behind the symptom

Picture the corticospinal tract as a bundle of telephone lines running from the movement centers of the brain down the spinal cord. In HSP, the longest of those lines, the ones that reach the lower body, begin to fail at their far ends first. This is why the legs are affected long before, and often instead of, the arms.

Those lines carry two kinds of message. One is the command to move. The other, less obvious, is a constant quieting signal that keeps spinal reflexes from overreacting. When the quieting signal fades, reflexes fire too readily. Tap the knee and the leg jumps; try to bend the ankle and the calf resists. NINDS describes this pattern of exaggerated reflexes, stiffness and weakness as the core of the condition.

Two practical consequences follow. First, stiffness and weakness coexist, and they pull treatment in opposite directions. Reduce spasticity too aggressively and a person whose stiff legs were, in effect, propping them up can find standing harder. Skilled clinicians aim for the point where movement is freer without support being lost.

Second, the stiffness is not fixed. Cold, pain, a full bladder, infection, fatigue and anxiety all increase spasticity by adding noise to an already over-excitable circuit. Many people notice their legs are far tighter on a bad night’s sleep or during a urinary infection. This is why HSP care spends so much time on things that seem unrelated to the legs: bladder management, sleep, temperature, footwear.

Loss of vibration sense in the feet and mild bladder urgency are common companions, according to NINDS, because neighboring pathways in the spinal cord are affected too. Understanding that these come from the same source, rather than being separate illnesses, makes the treatment plan feel less scattered.

Pure or complicated HSP: why the label changes the care plan

Clinicians divide HSP into two broad forms, and the distinction shapes nearly every downstream decision. In pure (or uncomplicated) HSP, the problem is essentially limited to the legs and bladder: stiffness, weakness, reduced vibration sense in the feet and urinary urgency. In complicated HSP, additional features appear, which NINDS lists as including seizures, peripheral nerve damage, problems with coordination, vision or hearing changes, and cognitive difficulties.

The label matters because a plan for pure HSP can be relatively focused. Physiotherapy, spasticity management and bladder care cover most needs. A plan for complicated HSP has to be broader, drawing in epilepsy specialists, ophthalmology, audiology or neuropsychology, and the priorities may differ: for some people, preventing falls from combined stiffness and poor balance takes precedence over reducing stiffness itself.

Genetics feeds into this. Well over 80 genetic types of HSP have been described, and the most common, known as spastic paraplegia type 4 (SPG4), accounts for roughly 40% of cases inherited in an autosomal dominant pattern according to MedlinePlus Genetics. Autosomal dominant means a single altered copy of the gene, from either parent, is enough to cause the condition. SPG4 is usually pure. Other types, particularly some inherited in recessive or X-linked patterns, are more often complicated.

Age of onset varies enormously, from early childhood to late adulthood, and does not reliably predict how quickly things progress. What the genetic and clinical picture does offer is a rough map of which complications to watch for, so the team can screen for them before they cause trouble rather than react afterward. If your type is known, it is reasonable to ask what that specific type tends to involve and how the surveillance plan reflects it.

Who is treated straight away, and who is usually asked to wait?

Not everyone with a new HSP diagnosis is started on medicine, and that surprises people. The decision turns on function, not on the diagnosis itself.

People are usually offered active spasticity treatment early when stiffness is already interfering with walking distance, causing falls, disturbing sleep through night-time spasms, producing pain, or beginning to pull the feet into fixed positions. In these situations, the potential benefit of reducing tone is clear and the goals are measurable: fewer trips, longer walks, uninterrupted nights.

People are often asked to wait, or rather to begin with movement-based care alone, when symptoms are mild, when walking is largely preserved, or when the stiffness is doing useful work by supporting weakened legs. For this group, a supervised stretching and strength program plus periodic review is the standard starting point described by the NHS. Medicines are held in reserve, not refused. The reasoning is that antispasticity drugs carry side effects, notably drowsiness and, in some cases, added weakness, that are hard to justify when the trade-off in function is marginal.

Children are a special case. Because growth changes muscle length and joint alignment, pediatric HSP care leans heavily on physiotherapy, orthotics and monitoring for tightening tendons, with medicine decisions individualized and revisited as the child grows. Adults who present late in life may prioritize maintaining independence at home over ambitious walking targets.

Two questions guide the team at every review: what is this person unable to do that they want to do, and would reducing stiffness plausibly change that? When the answer to the second is no, waiting is a legitimate treatment choice rather than a failure to act. When circumstances change, the plan changes with them, and the call remains with the treating clinician.

Hereditary spastic paraplegia physiotherapy: the backbone of the plan

Ask anyone who has lived with HSP for a decade what made the largest day-to-day difference and most will not name a medicine. They will describe a stretching routine they have done, more or less faithfully, every morning for years.

Physiotherapy in HSP has three aims. The first is maintaining muscle length. Spastic muscles that are never taken through their full range slowly shorten, and a shortened calf or hamstring becomes a fixed contracture that no medicine can undo. Daily, sustained stretches of the calves, hamstrings, hip flexors and inner thigh muscles counter this. The NHS and NINDS both describe stretching as central to managing the condition.

The second aim is strength. This once caused hesitation, since therapists worried that effort would worsen spasticity. Current practice, as reflected in mainstream guidance, favors graded strengthening of the legs and trunk, because weakness rather than stiffness often limits walking as the years pass. A physiotherapist tailors the load so that fatigue does not tip into more falls.

The third aim is efficient movement. Gait training addresses the classic HSP walk, in which the toes catch, the knees stay bent and the legs swing stiffly, by working on stepping patterns, balance and the use of aids. Hydrotherapy, exercise in warm water, is popular because warmth reduces tone and buoyancy removes fear of falling, though its evidence base rests on small studies rather than large trials.

Frequency matters more than intensity. Supervised sessions are typically spaced weeks apart, with the real work happening at home in between. An occupational therapist complements this by looking at how tasks are done: getting out of a chair, managing stairs, dressing the feet. Progress is measured in walking distance, timed transfers and the absence of new contractures, not in symptom scores alone.

HSP spasticity management with medicines: what they do and how long they take

When stiffness outpaces what stretching can manage, medicines enter the plan. They fall into a few groups, and understanding the mechanism helps explain the side effects and the waiting.

Oral antispasticity medicines are usually the first step. Baclofen works at the spinal cord, mimicking a natural calming chemical to dampen the over-excitable reflexes described earlier. Tizanidine acts on a different receptor with a broadly similar effect. Both are described by the Cleveland Clinic and NHS as standard options for spasticity from conditions including HSP. Their common drawback is drowsiness and, for some, a sense of added weakness; the prescribing clinician adjusts the balance over weeks, and the effect is judged by function rather than by feel. Stopping these medicines abruptly can be harmful, so any change is made under supervision.

Botulinum toxin injections are the targeted option. The toxin is placed into a specific overactive muscle, most often the calf or inner thigh, where it blocks the nerve signal that makes the muscle contract. According to the Cleveland Clinic, the effect wears off after roughly three months, so treatment is repeated in cycles, each usually paired with stretching to use the window of looser muscle. Its appeal is precision: the rest of the body is unaffected.

An intrathecal baclofen pump is reserved for severe spasticity. A small device implanted under the skin delivers medicine directly into the fluid around the spinal cord, allowing a strong local effect with fewer whole-body side effects. It requires surgery, regular refills and a team experienced in managing it.

None of these alters the course of HSP. They change how the legs behave today, and every choice among them rests with the treating team.

Orthotics, walking aids and the home: managing stiff legs day to day

A neurologist can lower muscle tone; an orthotist can stop a toe catching. Both are treatment, and the second is often more immediately visible.

An orthotist is a specialist who designs and fits braces. In HSP the most common device is the ankle-foot orthosis, a lightweight splint worn inside the shoe that holds the foot at a right angle so the toes clear the ground during each step. This directly addresses the trip-and-fall risk that brings many people to attention in the first place. Some designs add a spring element that stores energy at heel strike and returns it at push-off, easing fatigue over distance. The NHS lists orthotics among core HSP treatments.

Walking aids are chosen for the job, not the diagnosis. Trekking poles suit people who walk long distances but tire; a single stick helps with balance on uneven ground; a rollator, a wheeled frame with a seat, allows rest stops and carrying. Using a wheelchair for long outings while walking at home is a reasonable energy-management strategy, not a surrender.

Footwear deserves attention. A firm heel counter, a sole that grips, and enough depth to house a brace reduce falls more reliably than most people expect. Shoes that slip on can slip off mid-step.

At home, an occupational therapist typically looks at three things: stairs, bathrooms and thresholds. Grab rails, a second banister, a shower seat and removing loose rugs are unglamorous changes with a strong logic, since a fall onto a hard floor is the single event most likely to abruptly reduce independence. Heat, whether a warm bath before stretching or a heated blanket at night, lowers tone temporarily and is widely used, though it is comfort care rather than proven therapy.

Beyond stiffness: bladder, fatigue, pain and feet

People sometimes assume everything except their legs is a separate problem. In HSP, several apparently unrelated symptoms come from the same spinal cord pathways, and treating them well often loosens the legs too.

Bladder urgency, the sudden pressing need to urinate, is one of the most common non-leg symptoms, noted by both NINDS and the NHS. It arises because the bladder, like the leg muscles, has lost some of its calming input and contracts too eagerly. A urologist may assess how well the bladder empties and offer medicines that quiet the bladder muscle, timed fluid strategies or pelvic floor physiotherapy. Untreated urgency matters beyond inconvenience: rushing to the toilet is a classic fall scenario, and urinary infections sharply worsen spasticity.

Fatigue in HSP is partly mechanical. Walking with stiff legs uses far more energy per step than a normal gait, so ordinary distances become exhausting. Energy conservation, planned rests, and appropriate aids address this more effectively than stimulants. Poor sleep from night spasms adds a second layer, which is one reason spasm control is often prioritized at night.

Pain has several sources: cramping in spastic muscles, joint strain from an altered walking pattern, and back pain from compensating with the trunk. Each has a different answer, from stretching and heat to gait correction to standard pain relief, and the team’s job is to work out which is which.

The feet themselves change over years. High arches and clawed toes, called pes cavus, are frequent in HSP. Podiatry, footwear adaptation and, occasionally, tendon surgery to release a fixed contracture are the options; the NHS lists surgery as a possibility for tightened tendons when other measures have failed, always as a team decision.

How the main hereditary spastic paraplegia treatment options compare

Seeing the layers side by side clarifies why they are almost always used together rather than as alternatives. Each targets a different point in the chain from nerve signal to stumbling toe.

Approach	What it targets	Typical timing of effect	Main trade-offs
Stretching and strengthening (physiotherapy)	Muscle length, weakness, gait pattern	Gradual; benefit depends on daily consistency over months	Time and discipline; no direct side effects
Oral antispasticity medicines	Whole-body reflex over-excitability	Adjusted over weeks by the prescriber	Drowsiness, possible added weakness; must not be stopped abruptly
Botulinum toxin injections	Specific overactive muscles	Wears off after roughly three months (Cleveland Clinic); repeated in cycles	Repeated procedures; local weakness if muscle chosen poorly
Intrathecal baclofen pump	Severe, widespread leg spasticity	Continuous once implanted; needs regular refills	Surgery, device maintenance, specialist follow-up
Orthotics and aids	Foot clearance, balance, energy use	Immediate once fitted	Comfort, appearance, need for refitting
Bladder, pain and fatigue care	Symptoms that worsen spasticity indirectly	Varies by symptom	Additional appointments and medicines

A few patterns stand out. Physiotherapy is the only row without a listed side effect, which is why it sits underneath everything else. Medicines trade breadth against precision: oral drugs reach every muscle, injections reach one. Equipment works instantly but does nothing to the underlying tone.

Where a person lands on this table depends on how far along they are, what limits them most, and how they weigh the trade-offs. A runner-turned-stumbler with mild stiffness may need only the first and fifth rows. Someone with painful night spasms and shrinking walking distance may use four rows at once. The mix is set and reset by the treating team, and there is no fixed sequence that every person must follow.

What the first weeks of a new treatment plan usually look like

The weeks after an HSP plan is drawn up, or after a significant change to it, tend to feel busier than expected. There is no single procedure to recover from, but there is a lot to learn.

The first appointments are usually assessments rather than interventions. A physiotherapist measures joint range, tests strength, times a short walk and watches how you climb a step. An occupational therapist may visit or ask detailed questions about the home. If orthotics are planned, an orthotist casts or scans the foot and ankle; the device is fitted at a later visit and often adjusted once or twice after that, because a brace that rubs will not be worn.

If an oral antispasticity medicine has been started, the early weeks are about calibration. The prescriber typically begins cautiously and reviews function and drowsiness at intervals, and people are often asked to keep a simple diary: how far they walked, how many spasms woke them, whether the legs felt looser or merely weaker. That record is what guides adjustment, and any change is made by the clinician, not by the person on their own.

Botulinum toxin, if used, follows a different rhythm. The injected muscle loosens over days, and the physiotherapist usually schedules intensive stretching or splinting during the weeks of maximum effect to lengthen the muscle while it is compliant.

Home programs begin immediately and rarely feel dramatic. Ten to fifteen minutes of stretching, morning and evening, becomes the anchor. Most people report that noticeable change in ease of walking, when it comes, takes weeks of consistency rather than days.

By the end of the first two or three months, the team usually reconvenes to compare the diary and measurements with the baseline. Goals are then kept, revised or replaced, and the longer review cycle begins.

Is hereditary spastic paraplegia progressive, and how is that built into care?

Yes, HSP is progressive, and pretending otherwise would be unkind. The word needs qualifying, though, because it carries a weight that does not match the typical experience.

NINDS describes progression in HSP as generally slow, often unfolding over many years, and highly variable between individuals and even within families carrying the same gene change. Some people notice little change across a decade; others move from unaided walking to using a stick or wheelchair for distance within a shorter span. There is no reliable way to predict, at diagnosis, which path an individual will follow. For pure HSP, NINDS and the NHS both note that life expectancy is usually not shortened, a point that deserves to be said plainly because many people fear otherwise.

Good long-term care treats progression as something to plan around rather than something to be ambushed by. That shows up in several practical ways. Review appointments are scheduled in advance, not left until a crisis. Baseline measurements taken early make later change objective rather than a matter of impression. Contracture prevention is pursued relentlessly from the start, because a fixed joint is permanent while spasticity is adjustable. Equipment is introduced slightly ahead of absolute need, so that learning to use a rollator happens before the first serious fall rather than after.

Emotional planning is part of this too. A diagnosis that unfolds slowly gives time to adapt, but it also means grieving small losses repeatedly. Referral to counseling or a peer support group is a legitimate component of treatment, not an afterthought.

Research continues into therapies that might target the underlying nerve degeneration, and trials are ongoing for some genetic types. None has yet been shown to change the course of HSP, and any offer of a treatment claiming to do so should be discussed with your neurologist before anything else.

Genetic testing, family planning and what a result changes

Genetic testing sits slightly apart from the rest of HSP treatment because it does not change how stiff the legs are. It can change almost everything else about how the plan is framed.

Testing usually involves a blood sample analyzed for changes in a panel of genes known to cause HSP. A positive result confirms the diagnosis, which matters because several other conditions, including some forms of multiple sclerosis and vitamin deficiencies affecting the spinal cord, can mimic HSP and are treated very differently. It also identifies the type. As MedlinePlus Genetics explains, SPG4 is the most common form and is usually pure, whereas some other types carry a higher likelihood of complicated features; knowing which you have shapes the surveillance schedule.

A negative result does not rule HSP out. Not every causative gene has been identified, and a clinical diagnosis based on examination and family history remains valid. People are sometimes retested years later as panels expand.

The family dimension is where genetic counseling earns its place on the team. A genetic counselor is a health professional trained to explain inheritance patterns and their implications. In autosomal dominant HSP, each child of an affected parent has a one-in-two chance of inheriting the gene change, according to MedlinePlus Genetics. Recessive and X-linked forms follow different rules. Counseling covers whether relatives might wish to be tested, what testing means for children who currently have no symptoms, and reproductive options for those planning a family.

None of these conversations is urgent in the way that fall prevention is urgent, and some people prefer to defer them until the immediate plan feels settled. The counselor’s role is to lay out the options and their consequences; the choices, as with every part of HSP care, belong to the individual and their family.

What people often get wrong about HSP treatment

Misunderstandings about HSP cluster in a few predictable places, and correcting them often improves the plan more than any single intervention.

The first is that exercise makes it worse. Older advice sometimes discouraged effort for fear of increasing spasticity. Mainstream guidance now treats supervised strengthening and regular stretching as the foundation of care, as the NHS and NINDS describe. Deconditioning from avoiding activity is a far more reliable route to losing walking ability than exercise ever was.

The second is that looser is always better. Because spastic legs can provide passive support, some people discover that a dose adjustment that leaves them feeling wonderfully relaxed also leaves them unable to stand from a chair. The goal is function, and function sometimes means tolerating a degree of stiffness.

The third is that a wheelchair means giving up. Using a chair for a long outing while walking at home conserves energy for the things that matter and reduces fall risk on unfamiliar ground. It is a tool, chosen for a task.

The fourth is that a mild presentation means nothing needs to be done. Contractures develop silently over years. The stretching routine that seems pointless at age thirty is what preserves ankle range at fifty.

The fifth is that HSP behaves like multiple sclerosis or motor neuron disease. It is a different condition with a different course, and NINDS notes that pure HSP typically does not shorten life. Reading about other diagnoses can generate fear that does not apply.

The last is that a treatment advertised online as targeting the underlying cause must be worth trying. No such therapy has been shown to work in HSP. Anything of that kind belongs in a conversation with your neurologist, ideally before money or hope has been spent.

Questions to ask your care team

A neurology appointment for a slow-moving condition can feel oddly rushed. Arriving with questions written down changes the dynamic, and the following tend to draw out the information that shapes a plan.

• Do you consider my HSP pure or complicated, and which additional features, if any, should we be screening for?
• Has genetic testing been done, and if so, what does my specific type tend to involve over time?
• What are the measurable goals of my current plan: walking distance, night-time spasms, falls, pain?
• Why have you recommended starting, or not yet starting, an antispasticity medicine, and what would change that decision?
• If I notice more drowsiness or weakness after a medicine change, whom do I contact and how quickly?
• How often will I see a physiotherapist, and what exactly should I be doing at home between visits?
• Would an ankle-foot orthosis or a different type of walking aid help me now, or is it better to wait?
• Should I be assessed for bladder function even though urgency seems minor?
• What is the plan if my walking changes noticeably between scheduled reviews?
• Are there clinical trials relevant to my genetic type, and how would I find out about them through you?
• Who coordinates my care across neurology, therapy, urology and orthotics, and how do those teams communicate?
• Is genetic counseling available for my family, and when would be a sensible time to arrange it?

Two habits make these questions more useful. Bring a short record of recent weeks, including falls, walking distances and sleep, so that the discussion rests on something concrete. And ask the team to summarize the agreed plan in writing at the end, including who does what and when the next review will be. A plan that lives only in the clinician’s notes is hard to follow at home, and HSP care is, above all, something that happens at home.

When to call your doctor

HSP progresses slowly, so a sudden change is, by definition, unexpected and worth reporting. The pattern to hold in mind is this: gradual drift over months is the condition behaving as described; an abrupt shift over hours or days usually has another explanation that needs finding.

Contact your care team promptly, or seek urgent care, if you notice any of the following:

• A sudden, marked increase in leg stiffness or weakness over hours or a few days, especially with fever, burning on urination or other signs of infection, since infections commonly trigger spasticity flares and may need treatment themselves.
• New numbness, weakness or clumsiness in the arms or hands, or new difficulty with speech, swallowing or vision, which are not typical of pure HSP and should be assessed.
• Loss of bladder or bowel control, inability to pass urine, or new severe back pain, which can indicate problems needing rapid evaluation.
• A fall causing a head injury, a limb you cannot bear weight on, or new severe pain.
• Marked drowsiness, confusion, dizziness or a sharp increase in weakness after any change to an antispasticity medicine.
• Sudden severe worsening of spasticity, sweating, high temperature or altered alertness in anyone taking an oral or pumped antispasticity medicine, particularly if a dose has been missed or a pump alarm has sounded, since abrupt interruption of these medicines can be dangerous.
• A pressure sore, a wound on the foot that is not healing, or a new red, hot, swollen calf.
• Low mood that persists, or thoughts of self-harm; living with a progressive condition is hard, and help is part of care.

Between these urgent situations and the routine review, there is a middle ground: shrinking walking distance, more frequent trips, a brace that rubs, spasms newly disturbing sleep. These do not need emergency care but do warrant bringing the next appointment forward rather than waiting it out. Your team can only adjust what they know about, and every decision about changing treatment rests with them.

Frequently asked questions

Is hereditary spastic paraplegia progressive?

Yes, HSP is progressive, but the pace is usually slow and unfolds over many years, according to the NIH’s National Institute of Neurological Disorders and Stroke. Progression varies widely between people and even within families carrying the same gene change. Long-term care plans anticipate this by taking baseline measurements early, scheduling regular reviews and introducing aids slightly ahead of need.

What is the outlook for HSP life expectancy?

For pure HSP, life expectancy is usually not shortened, according to both NINDS and the NHS. The condition mainly affects walking, leg stiffness and bladder function rather than vital organs. Complicated forms with additional neurological features can have a different course, which is one reason clinicians try to establish the type and plan surveillance accordingly. Your neurologist can discuss what applies to your situation.

What does hsp spasticity management with medicine involve?

It usually begins with oral antispasticity medicines that dampen over-excitable spinal reflexes, adjusted over weeks by the prescriber while watching for drowsiness or added weakness. Targeted botulinum toxin injections may be used for specific tight muscles, and an implanted intrathecal pump is reserved for severe cases. None slows the underlying condition, and all decisions about starting or changing them rest with the treating clinician.

How often should someone with HSP do hereditary spastic paraplegia physiotherapy?

Supervised sessions are typically spaced weeks apart, but the daily home program is what matters most. Most therapists recommend stretching the calves, hamstrings and hip muscles every day, often morning and evening, alongside graded strengthening a few times a week. The NHS and NINDS describe stretching and exercise as central to HSP care. Your physiotherapist sets the specific frequency for you.

Can HSP be treated with surgery?

Surgery has a limited role. The NHS notes that tendon-release procedures may be considered when a muscle has become permanently shortened and other measures have failed, and an intrathecal baclofen pump requires a surgical implant. Surgery does not address the nerve degeneration itself. Whether any operation is appropriate is a decision for the treating team after other options have been weighed.

Does exercise make HSP worse?

No, current mainstream guidance supports regular stretching and supervised strengthening as the foundation of HSP care. Older advice sometimes discouraged effort, but deconditioning from inactivity is a more reliable way to lose walking ability than exercise. A physiotherapist tailors the load so that fatigue does not increase falls, and adjusts the program as the condition changes over time.

Why does a bladder infection make my legs stiffer?

Infection, pain, cold and fatigue all add extra signals to spinal reflexes that are already over-excitable in HSP, so spasticity temporarily increases. Urinary infections are a common trigger because bladder urgency is itself part of the condition. A sudden flare of stiffness with fever or burning on urination should be reported promptly, since treating the infection usually settles the legs.

Will I end up in a wheelchair?

It is not possible to predict at diagnosis. Some people walk unaided for decades while others use a stick, rollator or wheelchair for distance sooner, and NINDS notes wide variation even within families. Many people use a wheelchair for long outings while walking at home, as an energy-saving tool rather than a permanent change. Regular reviews allow aids to be introduced as they become useful.

Should my children be tested for HSP?

That is a decision best made with a genetic counselor. In autosomal dominant forms, each child of an affected parent has a one-in-two chance of inheriting the gene change, according to MedlinePlus Genetics, but testing a child without symptoms raises ethical and practical questions. Counseling covers inheritance patterns, timing of testing and reproductive options, and can be arranged whenever the family feels ready.

Are there treatments that target the cause of HSP?

Not yet. NINDS states that no therapy is currently known to prevent, slow or reverse the nerve degeneration in HSP. Research is ongoing, and trials exist for some genetic types, but anything advertised as treating the underlying cause has not been proven to work. Discuss any such offer with your neurologist, who can also tell you about legitimate trials relevant to your type.

References

• Hereditary Spastic Paraplegia: National Institute of Neurological Disorders and Stroke (NIH)
• Spastic paraplegia type 4: MedlinePlus Genetics
• Hereditary spastic paraplegia: NHS
• Spasticity: Cleveland Clinic

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.