Thigh Weakness and Knee Pain from Cellulitis - Orthopedics

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Weakness in lifting the thigh?


The patient is experiencing weakness in lifting the left thigh and has knee pain while walking, but has strength in lifting the calf.
What could be the underlying issue? Thank you!

Feng, 40~49 year old female. Ask Date: 2024/04/17

Dr. Chen Yongxue reply Orthopedics


Hello, "The weakness in lifting the left thigh and the knee pain while walking may be due to cellulitis." It is advisable to visit an orthopedic or surgical outpatient clinic for examination.
Thank you.

Reply Date: 2024/04/17

More Info


Cellulitis is a bacterial skin infection that can lead to inflammation and swelling in the affected area, often causing pain and discomfort. When it occurs in the thigh, it can lead to weakness and pain in the thigh muscles, particularly when trying to lift the leg or walk. The symptoms you describe—thigh weakness, knee pain, and the ability to lift the lower leg—suggest that the issue may be localized to the muscles or nerves in the thigh rather than a systemic problem affecting the entire leg.

The weakness in your thigh could be attributed to several factors related to cellulitis. First, the inflammation caused by the infection can lead to pain and discomfort, which may inhibit your ability to use the thigh muscles effectively. Pain can lead to a protective mechanism where you unconsciously avoid using the affected muscles, resulting in weakness. Additionally, if the infection has caused significant swelling, it may compress nearby nerves, leading to further weakness or altered sensation.

The knee pain you are experiencing could be a result of referred pain from the thigh or could be due to compensatory movements. When one part of the leg is weak or painful, you may unconsciously alter your gait, putting extra strain on the knee joint. This can lead to pain in the knee, especially if the knee is not used to the altered mechanics.

In terms of diagnosis, it is essential to consider the following:
1. Physical Examination: A thorough examination by a healthcare professional is crucial. They will assess the range of motion, strength, and any signs of swelling or redness in the thigh and knee.

2. Imaging Studies: Depending on the findings from the physical examination, imaging studies such as an ultrasound or MRI may be warranted to evaluate the extent of the cellulitis and to rule out any underlying issues such as muscle tears or joint problems.

3. Blood Tests: Laboratory tests can help assess the severity of the infection and check for markers of inflammation, such as C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR).

4. Treatment: The primary treatment for cellulitis involves antibiotics to address the infection. Pain management may also be necessary, and in some cases, physical therapy can help restore strength and function to the affected muscles once the infection is under control.

5. Recovery: Recovery from cellulitis can vary based on the severity of the infection and the individual's overall health. It is essential to follow your healthcare provider's recommendations for treatment and rehabilitation.

In summary, the weakness in your thigh and knee pain are likely related to the effects of cellulitis on the muscles and nerves in that area. It is crucial to seek medical attention to ensure proper diagnosis and treatment. Once the infection is treated, rehabilitation exercises may be beneficial to regain strength and function in the affected leg. Always consult with a healthcare professional for personalized advice and treatment options.

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