418.Loose body in the knee joint

Figure 4A. Sagittal T2-weighted FSE image of the knee. A subtle low-T2-signal focus (arrow) is identified in the posterior knee joint.

Figure 4B. Sagittal T2-weighted GRE image of the knee. The low-T2-signal focus (arrow) “blooms” and is much more evident.

Diagnosis:  Loose body in the knee joint.

Clinical Discussion:  Loose bodies in the knee joint can come from detached cartilage or bone. Free loose bodies within a joint can cause intermittent joint locking and pain.In this case, the loose body is likely calcified and strongly diamagnetic, again resulting in susceptibility artifact.

Loose body：a small piece of bone or cartilage within a joint, usually the result of wear and tear and/or trauma. Most common in the knee joint. Symptoms include pain, swelling and stiffness and can result in “locking”of a joint.

Notes：

1. cartilage /'kɑːt(ɪ)lɪdʒ/ /'kɑrtɪlɪdʒ/ n. <解>软骨

2. Loose body 关节游离体

来源：每天朗读一段医学影像学英语文章

圈主

深圳市人民医院放射科副主任医师杨敏洁

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