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Knee replacement
Knee replacement, also known as knee arthroplasty, is a surgical procedure to replace the weight-bearing surfaces of the knee joint to relieve pain and disability, most commonly offered when joint pain is not diminished by conservative sources. It may also be performed for other knee diseases, such as rheumatoid arthritis. In patients with severe deformity from advanced rheumatoid arthritis, trauma, or long-standing osteoarthritis, the surgery may be more complicated and carry higher risk. Osteoporosis does not typically cause knee pain, deformity, or inflammation, and is not a reason to perform knee replacement.
Knee replacement surgery can be performed as a partial or a total knee replacement. In general, the surgery consists of replacing the diseased or damaged joint surfaces of the knee with metal and plastic components shaped to allow continued motion of the knee.
The operation typically involves substantial postoperative pain and includes vigorous physical rehabilitation. The recovery period may be 12 weeks or longer and may involve the use of mobility aids (e.g. walking frames, canes, crutches) to enable the patient's return to preoperative mobility. It is estimated that approximately 82% of total knee replacements will last 25 years.
Knee replacement surgery is most commonly performed in people with advanced osteoarthritis and should be considered when conservative treatments have been exhausted. Total knee replacement is also an option to correct significant knee joint or bone trauma in young patients, treat complex fractures in elderly, either due to previous symptomatic osteoarthritis or situations where internal fixation with plates and screws is deemed too hazardous. Similarly, total knee replacement can be performed to correct mild valgus or varus deformity. Serious valgus or varus deformity should be corrected by osteotomy. Physical therapy has been shown to improve function, and may delay or prevent the need for knee replacement. Pain often is noted when performing physical activities requiring a wide range of motion in the knee joint.
Knee replacement provides significantly better results than exercise training in terms of reducing pain 6 months to 2 years afterwards. People who have had knee replacements have lower death rates than the matched population for 10 years after surgery, but increased rates from 11 years onwards. For this reason it is sometimes argued that the age group 65-75 is the best time to consider having a knee replacement if activity is being severely curtailed by knee pain. Although knee replacement has superior 24 month results in terms of pain relief than exercise treatment, it may not be cost effective compared to the option of initial exercise treatment followed by crossover to knee replacement if results are unsatisfactory.
To indicate knee replacement in case of osteoarthritis, its radiographic classification and severity of symptoms both should be substantial. Such radiography should consist of weightbearing X-rays of both knees: AP, lateral, and 30 degrees of flexion. AP and lateral views may not show joint space narrowing, but the 30-degree flexion view is most sensitive for narrowing. Full-length projections also are used in order to adjust the prosthesis to provide a neutral angle for the distal lower extremity.[citation needed] Two angles used for this purpose are:
The patient is to perform range-of-motion exercises, and hip, knee and ankle strengthening as directed daily. Exercises that include strengthening of hip flexors, hip abductors and knee flexors helps to recover faster post operatively.[medical citation needed] Before the surgery is performed, pre-operative tests are done: usually a complete blood count, electrolytes, APTT and PT to measure blood clotting, chest X-rays, ECG, and blood cross-matching for possible transfusion. About a month before the surgery, the patient may be prescribed supplemental iron to boost the hemoglobin in their blood system. Accurate X-rays of the affected knee are needed to measure the size of components which will be needed. Medications such as warfarin and aspirin will be stopped some days before surgery to reduce the amount of bleeding. Patients may be admitted on the day of surgery if the pre-op work-up is done in the pre-anesthetic clinic or may come into hospital one or more days before surgery. As of 2017, there was insufficient quality evidence to support the use of pre-operative physiotherapy in older adults undergoing total knee arthroplasty. However, as of 2022, there has been renewed interest in improving patient outcomes and "prehab" has become standard practice.
Preoperative education is currently an important part of patient care. There is some evidence that it may slightly reduce anxiety before knee-replacement surgery, with low risk of detrimental effects.
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Knee replacement AI simulator
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Knee replacement
Knee replacement, also known as knee arthroplasty, is a surgical procedure to replace the weight-bearing surfaces of the knee joint to relieve pain and disability, most commonly offered when joint pain is not diminished by conservative sources. It may also be performed for other knee diseases, such as rheumatoid arthritis. In patients with severe deformity from advanced rheumatoid arthritis, trauma, or long-standing osteoarthritis, the surgery may be more complicated and carry higher risk. Osteoporosis does not typically cause knee pain, deformity, or inflammation, and is not a reason to perform knee replacement.
Knee replacement surgery can be performed as a partial or a total knee replacement. In general, the surgery consists of replacing the diseased or damaged joint surfaces of the knee with metal and plastic components shaped to allow continued motion of the knee.
The operation typically involves substantial postoperative pain and includes vigorous physical rehabilitation. The recovery period may be 12 weeks or longer and may involve the use of mobility aids (e.g. walking frames, canes, crutches) to enable the patient's return to preoperative mobility. It is estimated that approximately 82% of total knee replacements will last 25 years.
Knee replacement surgery is most commonly performed in people with advanced osteoarthritis and should be considered when conservative treatments have been exhausted. Total knee replacement is also an option to correct significant knee joint or bone trauma in young patients, treat complex fractures in elderly, either due to previous symptomatic osteoarthritis or situations where internal fixation with plates and screws is deemed too hazardous. Similarly, total knee replacement can be performed to correct mild valgus or varus deformity. Serious valgus or varus deformity should be corrected by osteotomy. Physical therapy has been shown to improve function, and may delay or prevent the need for knee replacement. Pain often is noted when performing physical activities requiring a wide range of motion in the knee joint.
Knee replacement provides significantly better results than exercise training in terms of reducing pain 6 months to 2 years afterwards. People who have had knee replacements have lower death rates than the matched population for 10 years after surgery, but increased rates from 11 years onwards. For this reason it is sometimes argued that the age group 65-75 is the best time to consider having a knee replacement if activity is being severely curtailed by knee pain. Although knee replacement has superior 24 month results in terms of pain relief than exercise treatment, it may not be cost effective compared to the option of initial exercise treatment followed by crossover to knee replacement if results are unsatisfactory.
To indicate knee replacement in case of osteoarthritis, its radiographic classification and severity of symptoms both should be substantial. Such radiography should consist of weightbearing X-rays of both knees: AP, lateral, and 30 degrees of flexion. AP and lateral views may not show joint space narrowing, but the 30-degree flexion view is most sensitive for narrowing. Full-length projections also are used in order to adjust the prosthesis to provide a neutral angle for the distal lower extremity.[citation needed] Two angles used for this purpose are:
The patient is to perform range-of-motion exercises, and hip, knee and ankle strengthening as directed daily. Exercises that include strengthening of hip flexors, hip abductors and knee flexors helps to recover faster post operatively.[medical citation needed] Before the surgery is performed, pre-operative tests are done: usually a complete blood count, electrolytes, APTT and PT to measure blood clotting, chest X-rays, ECG, and blood cross-matching for possible transfusion. About a month before the surgery, the patient may be prescribed supplemental iron to boost the hemoglobin in their blood system. Accurate X-rays of the affected knee are needed to measure the size of components which will be needed. Medications such as warfarin and aspirin will be stopped some days before surgery to reduce the amount of bleeding. Patients may be admitted on the day of surgery if the pre-op work-up is done in the pre-anesthetic clinic or may come into hospital one or more days before surgery. As of 2017, there was insufficient quality evidence to support the use of pre-operative physiotherapy in older adults undergoing total knee arthroplasty. However, as of 2022, there has been renewed interest in improving patient outcomes and "prehab" has become standard practice.
Preoperative education is currently an important part of patient care. There is some evidence that it may slightly reduce anxiety before knee-replacement surgery, with low risk of detrimental effects.