Can't bend the knee

Introduction Anterior sacral bursitis manifests as pain and swelling of the anterior tibial, can not bend knees, local tenderness and fluctuations, puncture with blood or bloody fluid.

Cause

Repeated mechanical wear or external force hit the knee bursa.

an examination

Related inspection

CT examination of bone and joint and soft tissue

The anterior sac is located in front of the tibia. When it is inflamed, there is an increase in synovial fluid and a swelling of the sac. Trauma or infection often causes acute inflammation of the bursa. It is characterized by pain and swelling before the axilla, can not bend knees, local tenderness and fluctuations, puncture with blood or bloody fluid.

Differential diagnosis

Traumatic anterior bursitis can be caused by acute injury, such as landing on the humerus when falling, or by repeated minor injuries, such as "women's knees", both of which are effective in conservative treatment. However, if fibrosis occurs, or the synovial membrane is thickened with painful nodules, when the conservative treatment is ineffective, the bursa should be surgically removed.

Suppurative anterior bursitis is common, especially in children. If the anterior sac is very large, the swelling is extremely obvious and can be misdiagnosed as suppurative knee arthritis. A careful examination can confirm the diagnosis. Puncture 1 or 2 times a day, properly braked and treated with antibiotics, the effect is usually good. If there is no significant improvement in symptoms within 36 to 48 hours, drainage should be performed. Smason reported a case of a post-traumatic fistula that connected the knee joint to the anterior sacral sac. This situation makes diagnosis and treatment difficult, especially in the case of suppurative bursitis.

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