Weakness in the Knee After Bending: Causes and Solutions - Orthopedics

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Experiencing weakness in the knee after bending can be a concerning issue, especially following an injury like the one you described while playing basketball. The symptoms you are experiencing—pain on the outer side of the knee, a feeling of weakness after bending, and difficulty straightening the leg—could be attributed to several underlying causes.


Possible Causes
1. Ligament Strain or Injury: The sudden movement during jumping and landing can lead to strains or tears in the ligaments around the knee, particularly the lateral collateral ligament (LCL) or the anterior cruciate ligament (ACL). These injuries can result in instability and a feeling of weakness in the knee.

2. Meniscus Tear: The meniscus is a cartilage structure that acts as a cushion between the femur and tibia. A tear can occur during twisting movements, leading to pain, swelling, and a sensation of weakness or locking in the knee.

3. Patellar Tendonitis: Overuse or acute injury can lead to inflammation of the patellar tendon, causing pain and weakness, particularly when bending or straightening the knee.

4. Bursitis: Inflammation of the bursae (small fluid-filled sacs that cushion the knee joint) can also cause pain and a feeling of weakness, especially after bending the knee.

5. Muscle Weakness or Imbalance: If the muscles surrounding the knee, particularly the quadriceps and hamstrings, are weak or imbalanced, this can lead to a feeling of instability or weakness when bending or straightening the knee.


Recommended Actions
1. Rest and Ice: Continue to rest the knee and apply ice to reduce inflammation and pain. Avoid activities that exacerbate the symptoms.

2. Physical Therapy: A physical therapist can assess your knee and develop a rehabilitation program tailored to strengthen the muscles around the knee, improve flexibility, and restore function. This may include exercises to strengthen the quadriceps, hamstrings, and hip muscles.

3. Gradual Return to Activity: Once the pain subsides and strength improves, gradually return to basketball and other activities. Start with low-impact exercises and progressively increase intensity.

4. Use of Supportive Devices: Depending on the severity of your symptoms, using a knee brace or support during activities may help stabilize the knee and provide additional support.

5. Consult a Specialist: Given the duration of your symptoms and the specific nature of your weakness, it would be wise to consult an orthopedic specialist. They can perform a thorough examination, possibly including imaging studies like an MRI, to determine the exact cause of your symptoms.


When to Seek Immediate Medical Attention
If you experience significant swelling, inability to bear weight on the affected leg, or if the pain worsens, seek medical attention promptly. These could be signs of a more serious injury that requires immediate intervention.


Conclusion
In summary, the weakness you are experiencing in your knee after bending could be due to various factors, including ligament injuries, meniscus tears, or muscle imbalances. It is essential to rest, ice, and consider physical therapy to strengthen the knee. Consulting an orthopedic specialist will provide a clearer diagnosis and tailored treatment plan. Early intervention can significantly improve your recovery and help you return to your regular activities, including basketball.