What causes the inability to fully straighten the knee with a feeling of tightness, and what should be done about it?

Jun 05, 2023 Source: Cainiu Health

Dr. Lin Yunfei

Introduction

Knee stiffness and the inability to fully straighten the knee may be related to conditions such as knee hyperextension, knee arthritis, or meniscus injury. These can be managed through daily care, medication, and other interventions. Prolonged postures involving extended knees—such as standing or sitting for long periods—may lead to tightness and restricted extension. This condition typically does not require special treatment and can be relieved with appropriate movement and activity.

Knee stiffness and the inability to fully straighten the knee may be related to factors such as knee hyperextension, knee arthritis, or meniscus injury. Treatment options include daily care and medication. Specific causes are analyzed as follows:

1. Knee Hyperextension

If the knee remains extended for prolonged periods—such as during long periods of standing or sitting—it may lead to tightness and difficulty straightening the knee. This condition typically does not require special treatment and can be relieved with appropriate movement and activity.

2. Knee Arthritis

Knee arthritis is caused by cartilage degeneration and inflammation in the joint, leading to stiffness, pain, and an inability to fully extend the knee. Additionally, knee arthritis may be accompanied by symptoms such as joint swelling and redness. Patients may follow medical advice to take anti-inflammatory medications such as celecoxib capsules or ibuprofen sustained-release tablets.

3. Meniscus Injury

The meniscus is a cartilage structure connecting the femur and tibia. When injured, it can restrict knee joint movement. Patients should rest adequately; during the acute phase, applying ice packs can help reduce inflammatory responses.

In addition to the common causes listed above, conditions such as rheumatoid arthritis or gouty arthritis may also contribute. If symptoms persist or fail to improve, prompt medical evaluation at a hospital is recommended.

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