第16天，骨性关节面及其下骨质破坏区仍然存在，关节间隙与正常间隙比较显示增宽，周围软组织肿胀显著。

By day 16, bone erosions still existed, joint space wider than normal, and swelling of soft tissue was significant.

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目的探讨膝关节色素沉着绒毛结节滑膜炎(PVNS)的发病与骨破坏机制、影像特征。

Purpose To research the pathogenesis and mechanism of bone erosion and the imaging characters of pigmented villonodular synovitis (PVNS) of the knee.

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影像学结果显示前向寰枢椎半脱位最常见，有16例，与侵蚀性骨破坏累及寰枢、寰齿、寰枢关节有关。

The imageology showed that forward atlantoaxial subluxation was verified in 16 cases, which was related with erosive osteoclasia in the atlantoaxial, atlanto-odontoid and atlanto-occipital joints.

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