Prehabilitation: Why Getting Fit Before Hip or Knee Surgery Speeds Up Recovery

If there is one piece of advice I find myself repeating in clinic almost every week, it is this: the work you do before your hip or knee replacement matters just as much as the work you do afterwards. Patients often think of surgery as the starting line for recovery. In reality, by the time you walk into the operating theatre, the foundation for how well and how quickly you will recover has largely already been laid.

This is what we mean by prehabilitation, or "prehab" for short. And in twenty years of performing hip and knee replacements, I have become convinced that a structured few weeks of preparation can be the single biggest factor that separates a smooth recovery from a frustrating one.

What Prehabilitation Actually Means

Prehabilitation is not complicated, and it is not something that requires a gym membership or a personal trainer. At its simplest, it is a focused period usually four to six weeks before surgery during which you strengthen the muscles around the joint, improve your general fitness, optimise your weight where possible, and prepare your home and your mind for what is to come.

The principle behind it is straightforward. After surgery, your body has to do two things at once: heal the surgical site, and rebuild the strength and movement that arthritis has steadily taken away over years. The stronger and fitter you arrive at the operation, the less ground you have to make up afterwards. Patients who start in better condition consistently regain function faster, spend less time on crutches, and report better outcomes at six months.

What the Evidence Actually Shows

I am not someone who recommends interventions on the basis of theory alone. The reason I push prehabilitation with every patient is that the data has become genuinely persuasive.

Studies of patients undergoing total knee and hip replacement consistently show that those who complete a structured prehab programme have shorter hospital stays, regain walking distance earlier, and need less pain medication in the first two weeks after surgery. Quadriceps strength before knee replacement, in particular, is one of the strongest predictors of how well the knee will function six months and a year later.

What this tells me, very practically, is that the muscle you build now is muscle you will not have to fight to rebuild from a hospital bed.

The Muscles That Actually Matter

The exercises I recommend are not glamorous, and they do not need to be. The muscles that matter most around a hip or knee replacement are the quadriceps (the front of the thigh), the gluteals (the muscles around your hip and buttock), the hamstrings (back of the thigh), and the core. These are the muscles that get you out of a chair, climb stairs, hold your balance, and absorb load when you walk.

For most patients preparing for surgery, a simple daily routine works well:

• Quad sets tightening the thigh muscle while the leg is straight, holding for five seconds, repeated 10–15 times, three times a day.
• Straight leg raises lifting the straight leg six inches off the bed, holding briefly, then lowering. Ten repetitions, three times a day.
• Glute bridges lying on your back with your knees bent, lifting your hips off the bed. Ten repetitions, twice a day.
• Hip abduction lying on your side, lifting the top leg towards the ceiling. Ten repetitions on each side, daily.
• Heel slides gently bending and straightening the knee while lying down, to maintain range of motion.

None of these need equipment. None of them take long. What they require is consistency: a few weeks of daily practice will produce a noticeable difference in muscle tone and confidence by the time you arrive at hospital.

If you are still mobile enough, regular walking even short distances, several times a day is one of the most valuable things you can do. Swimming and stationary cycling are excellent options for patients whose pain limits walking, as they build cardiovascular fitness without loading the arthritic joint.

Weight, Smoking, and the Things People Find Harder to Talk About

I want to be honest about this, because patients often appreciate it more than reassurance.

If you are carrying significant excess weight, losing even a small amount before surgery can make a real difference. For every pound of body weight, the knee absorbs roughly four pounds of force with each step. The arithmetic is unforgiving, and it works in your favour as well as against you: losing five to ten pounds before surgery genuinely reduces the load on the new joint from the moment you stand up.

Smoking is the other conversation I have honestly with patients. Smoking impairs wound healing, increases the risk of infection, and slows bone integration around the implant. Stopping or even significantly cutting down four to six weeks before surgery measurably improves outcomes. If you have been thinking about giving up, the period before a joint replacement is genuinely the right moment to do it.

Alcohol intake is worth reviewing too. Reducing alcohol consumption in the weeks before surgery improves anaesthetic safety, supports better sleep, and helps with the medications you will be taking afterwards.

Nutrition and the Often-Forgotten Detail

Protein is the building block your body uses to repair tissue, and most patients I see are not eating enough of it particularly older patients. In the weeks before surgery, aim to include a good source of protein with every meal: eggs, fish, chicken, dairy, beans, or pulses. This is not about following a particular diet; it is about giving your body what it needs to heal.

Iron levels, vitamin D, and general hydration also matter. If your pre-assessment bloods show that you are anaemic or low in vitamin D, these are easily corrected and worth doing before surgery rather than discovering the problem afterwards.

Preparing Your Home Before You Arrive at the Hospital

The practical side of prehabilitation is just as important as the physical side, and it is often the thing patients leave to the last minute.

Before you come into hospital, walk around your house with fresh eyes. Are there loose rugs you might catch a crutch on? Is the chair you spend most of your time in firm enough, with armrests, to get out of without straining your operated leg? Is the bathroom set up safely grab rail near the shower, raised toilet seat if needed? Is there a clear path between your bed and the bathroom for the middle of the night?

I encourage patients to prepare meals in advance and freeze them, to move frequently used items to waist height, and to arrange for help with shopping and household tasks for the first two weeks. Discharge from hospital is not the moment to start working these things out.

The Mental Side of Preparation

I do not want to overlook this, because it matters more than people realise. Patients who arrive at surgery feeling well-informed, with a clear picture of what the first week will look like, consistently cope better in the early days. Anxiety amplifies pain perception, and unfamiliarity amplifies anxiety.

This is part of why I spend time with every patient before surgery walking them through what to expect the physiotherapy on day one, the realistic timeline of swelling, the moments where progress will feel slow, and the milestones where confidence returns. If you know what is coming, the difficult days feel less like setbacks and more like the expected shape of recovery.

What I Tell My Patients in Clinic

When a patient asks me what they should be doing in the weeks before their operation, my honest answer is: a little, every day, with intent. You do not need to transform yourself into an athlete. You need to be a slightly stronger, slightly fitter, slightly more prepared version of the person you are today.

Four weeks of focused prehabilitation is realistic for almost everyone. Six weeks is better, if you have the time. The patients who do this consistently and I see it in clinic every month recover faster, need less hands-on physiotherapy, and tell me at their six-week review that they wish more people had explained how much difference it would make.

If you are preparing for hip or knee replacement surgery in North Wales, Chester, or the wider Betsi Cadwaladr region and want a clear, personalised prehabilitation plan tailored to your fitness and your operation, I would be glad to see you.

Book a consultation → | Call 01978 268065

You may also find it useful to read our knee replacement recovery guide or hip replacement recovery guide for a week-by-week picture of what comes after surgery, so the prehab and rehab phases fit together in your mind.

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This article is written for general information only and does not replace personalised medical advice. Any prehabilitation programme should be tailored to your individual health, fitness, and the specific operation planned, ideally in discussion with your surgeon and physiotherapist.