The two main types of knee replacement are:
Commonly associated conditions:
Other causes include:
Post-surgery symptoms include:
Pre-surgery
Post-surgery
Knee replacement is a common operation that an orthopaedic surgeon will perform to replace the worn or damaged knee surfaces with an artificial joint. Both partial knee replacements (PKR) and total knee replacements (TKR) are common and vary based on individual considerations. The most common reason for undergoing a knee replacement is osteoarthritis (OA). OA is a common and potentially debilitating condition. In the end stages of OA, knee replacements are the mainstay of treatment and are effective in many cases (1). The aim of knee replacement surgery is the long-term relief of pain and restoring function.
Usually, your GP or physiotherapist will consider sending you for an orthopaedic examination if you have already exhausted other non-operative pathways. This includes extensive physiotherapy, painkillers, walking aids and injections. A clinician will also consider the nature of your pain and function before making the decision to refer you to an orthopaedic surgeon. They will make this decision in light of whether the pain is affecting your quality of life, mental wellbeing and sleep.
After surgery, common symptoms include pain, stiffness and inflammation. Usually, you will be in hospital for 3 to 5 days but recovery times can vary. Once you are able to be discharged from hospital you will be given advice about looking after your knee at home. Walking can be difficult so you will need to use a frame or crutches at first and a physiotherapist will teach you exercises to help strengthen your knee.
Most people can stop using walking aids around 6 weeks after surgery and start driving after 6 to 8 weeks. Full recovery can take up to 2 years as scar tissue heals and your muscles are restored by exercise. An exceedingly small amount of people will continue to have some pain after 2 years.
It is reported that 99% of knee replacements are due to osteoarthritis. Other less common conditions include rheumatoid arthritis or other similar inflammatory arthritis, severe trauma to the knee bones, bone death due to abrupt loss of blood supply to them, gout, haemophilia and knee deformation (2).
This is not an exhaustive list. These factors could increase the likelihood of someone needing a total knee replacement. It does not mean everyone with these risk factors will have a knee replacement.
Other causes include:
Knee replacement surgery is common and most people do not have complications. However, as with any operation, there are risks as well as benefits.
Complications are rare but can include:
In some cases, the new knee joint may not be completely stable and further surgery may be needed to correct it. Another risk of knee replacement surgery is the failure of the artificial joint. Daily use wears on even the strongest metal and plastic parts. Joint failure risk is higher if you stress the joint with high-impact activities or excessive weight-bearing. The most common indications for revision include aseptic loosening, infection and pain (6).
You must inform your doctor immediately if you notice:
An infected knee replacement usually requires antibiotics to kill the bacteria and/or surgery to remove the artificial parts. After the infection is cleared, another surgery is performed to install a new knee.
In 2017, there were 106,334 knee replacement procedures carried out in England, Wales and Northern Ireland. The average age of patients undergoing this surgery was 69 years (4). The incidence between gender is evenly split but is slightly higher in women at 56% (2).
Musculoskeletal physiotherapists and other appropriately qualified healthcare professionals can provide you with a diagnosis by obtaining a detailed history of your symptoms. A series of physical tests might be performed as part of your assessment to rule out other potentially involved structures and gain a greater understanding of your physical abilities to help facilitate an accurate working diagnosis.
Your treating clinician will want to know how your condition affects you day-to-day so that treatment can be tailored to your needs and personalised goals can be established. Intermittent reassessment will ascertain if you are making progress towards your goals and will allow appropriate adjustments to your treatment to be made. Imaging studies like MRI or ultrasound scans are usually not required to achieve a working diagnosis but in unusual presentations, they may be warranted.
A knee replacement will be considered based on the individual circumstances of each person. It is a major surgery so it is normally only recommended if other treatments, such as physiotherapy or steroid injections, have not reduced pain or improved mobility.
You may be offered knee replacement surgery if:
You will also need to be well enough to cope with both a major operation and the rehabilitation afterwards.
Before your knee replacement takes place, you will undergo pre-operative physiotherapy. Exercise promoting strength and flexibility of the knee can improve the outcome of the replacement. In a review of the literature, it was found that patients undergoing knee replacements had significant improvements in function, quadriceps strength and length of hospital stay (5).
Most people return home within 3-5 days. Upon returning home, you may feel extremely tired at first and the tissues surrounding your new knee will take time to heal. Follow the advice of the surgical team and call your GP if you have any worries or queries. You may be eligible for up to 6 weeks of home help and there may be aids that can help you. You may also want to arrange for someone to help you for a week or so.
Post-operative wound healing is critical to the outcome of a knee replacement. Therefore, it is vital to keep the wound clean and dry during this time. Each surgeon will have different protocols in managing wounds, so it is important to find out the surgeon’s specific wound care protocols.
The exercises your musculoskeletal physiotherapist gives you are an important part of your recovery. It is essential you continue with them once you are at home. Your rehabilitation will be monitored by a physiotherapist. Most people can manage without walking aids after 6 weeks (about 1½ months) but it is important that you adhere to the prescribed home exercises during this time. Most hospitals will give you an advice leaflet which contains all home exercises. You may also be referred to an outpatient department to see a physiotherapist where they will progress walking and other exercises. You can start driving after 6-8 weeks. Full recovery can take up to 2 years and a small number of people experience pain after 2 years.
After surgery, you will be under the care of a multidisciplinary team at the hospital which consists of your surgeon, ward nurse (who deals with the pain management side), musculoskeletal physiotherapist (deals with the progression of your mobility and exercises) and occupational therapist (they help you by assessing your home environment and may help you have some assistive aids to help with daily activities).
During your stay in the hospital, a physiotherapist will teach you exercises to help with symptoms and to start to strengthen your knee. You can usually begin these the day after your operation. It is important to follow the physiotherapist’s advice to avoid complications or dislocation of your new joint. You will also be provided with walking aids to help with mobility for the first 6 weeks.
It is normal to have initial discomfort while walking and exercising, and your legs and feet may be swollen. You may be put on a passive motion machine to restore movement in your knee and leg. This support will slowly move your knee while you are in bed. It helps to decrease swelling by keeping your leg raised and helps improve your circulation.
After being discharged from the hospital, you will be provided with an exercise programme to improve the mobility, strength and flexibility of the knee. Here are three rehabilitation programmes created by our specialist physiotherapists for recovery post-knee replacement. In some instances, a one-to-one assessment is appropriate to individually tailor targeted rehabilitation. However, these programmes provide an excellent starting point as well as clearly highlighting exercise progression.
The early plan is designed to provide you with some exercises to help increase movement and begin the process of getting the thigh muscles to re-engage. Pain should not exceed 3/10 on your self-perceived pain scale whilst completing this exercise programme.
Here our focus becomes regaining strength in the hips and legs. It is expected that you would be carrying on some of the movement-based exercises from the early programme and add in these exercises. Pain should not exceed 4/10 on your self-perceived pain scale whilst completing this exercise programme.
In this plan, the exercises increase in difficulty as well as becoming more functional (whole-body) movements. Pain should not be any greater, but we would expect some increase in fatigue when performing these exercises Pain should not exceed 4/10 on your self-perceived pain scale whilst completing this exercise programme.
For patients wanting to return to physically demanding activities or sport, we would encourage a consultation with a physiotherapist as you will require further progression beyond the advanced rehabilitation stage. There is no restriction once you recover from your knee replacement, which can take up to 2 years. Many people do not feel comfortable kneeling for more than brief periods but any form of sport that does not cause significant pain or swelling is permitted.
As part of a multi-modal treatment approach, your musculoskeletal physiotherapist may also use a variety of other pain-relieving treatments to support symptom relief and recovery. Whilst recovering you might benefit from a further assessment to ensure you are making progress and establish the appropriate progression of treatment. Ongoing support and advice will allow you to self-manage and prevent future reoccurrence.
A knee replacement is only considered if all other treatment options are exhausted. These treatments include:
There are other types of surgery which are an alternative to knee replacement but results are often not as good in the long term. Your doctor will discuss the best treatment option with you. Other types of surgery may include:
https://www.nhs.uk/conditions/knee-replacement/
Arthritis Research UK information booklet – click here.
Please book an appointment with one of our physiotherapists if you think you are suffering from this condition and would like to find out more.
We have Pure Physiotherapy clinics across the country including Norwich, Dereham, Bolton, Manchester, Rochdale, Sheffield and Barnsley. Please view our clinics to find the closest physiotherapy clinic for you.
Structural knee injury, triggered either by a tear or through wear and tear.
Seen to be normal as we age, but in some situations can result in knee aches, pain or joint swelling.
Knee pain at the lower border of the kneecap which is also known as ‘jumper’s knee’.
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