Knee replacement surgery is a procedure used to treat severe knee damage, commonly caused by osteoarthritis. Before surgery, patients undergo several medical tests to assess their overall health, understand the condition of the knee joint, and identify potential risks. These evaluations help the medical team plan the procedure and prepare for recovery.
1. X-Ray of the Knee
A knee X-ray is one of the most important investigations before knee replacement surgery. It helps identify cartilage loss, narrowing of the joint space, bone changes, and deformities. Weight-bearing X-rays may be recommended to evaluate how the knee joint behaves while standing.
2. MRI Scan (When Required)
An MRI is not routinely necessary for every knee replacement patient. It may be recommended when additional information about ligaments, cartilage, soft tissues, or another suspected condition is needed. The decision depends on the patient’s symptoms and findings from the initial evaluation.
3. Blood Tests
Blood tests help assess general health and identify conditions that could affect surgery or recovery. Common investigations include:
- Complete Blood Count (CBC): Checks haemoglobin levels and looks for signs of anaemia or infection.
- Blood Sugar and HbA1c: Assess blood glucose control, particularly in people with diabetes.
- Kidney Function Tests: Evaluate kidney health and help guide medication and anaesthesia planning.
- Electrolytes: Check important minerals in the blood.
- Coagulation Profile: May be required to assess blood clotting, particularly for patients taking certain medications or with a relevant medical history.
The exact tests depend on the patient’s health and hospital protocol.
4. ECG and Cardiac Evaluation
An electrocardiogram (ECG) records the electrical activity of the heart. It may be recommended based on the patient’s age, medical history, symptoms, and risk factors. Patients with known heart disease or concerning symptoms may require additional cardiac assessment before surgery.
5. Chest X-Ray and Other Investigations
A chest X-ray is not necessary for every patient. It may be advised when respiratory symptoms, relevant medical conditions, or other clinical factors make it appropriate. Additional investigations may include urine tests or infection screening when indicated by the patient’s history and examination.
6. Anaesthesia and General Health Assessment
Before surgery, an anaesthesiologist reviews the patient’s medical history, current medicines, allergies, previous anaesthesia experiences, and overall fitness for the procedure. Blood pressure, body weight, nutritional status, and existing conditions such as diabetes or high blood pressure may also be assessed.
Frequently Asked Questions
Are all tests mandatory before knee replacement surgery?
No. The required tests vary according to the patient’s age, medical history, symptoms, and the planned procedure.
Who decides which tests are needed before surgery?
The treating orthopaedic team, along with the anaesthesiologist and other relevant specialists, determines which investigations are appropriate.
Preoperative testing is an important part of knee replacement planning. It helps assess joint damage, identify medical conditions, and reduce avoidable risks. Patients looking for information from an orthopedic surgeon in Indore should understand that the choice of tests depends on individual health needs rather than a fixed checklist. A personalised assessment helps the medical team plan surgery and recovery more safely.
Disclaimer: This article is for general educational purposes and does not replace an individual medical evaluation.
