指趾内軟骨腫に用いたβ-リン酸三カルシウム（β-TCP）のX線像の経時的変化

Time-Dependent Changes in X-ray Images in the Cases Using β-TCP for Enchondroma of Hands and Digit

　指趾発生の内軟骨腫に対し，β-TCP（β-リン酸三カルシウム）を使用しその経時的変化をX線像で検討した．症例は6例6指趾，発生部位は基節骨3例，中節骨2例，中手骨1例であった．手術は病巣掻爬後β-TCPを顆粒状に粉砕し十分に充塡した．これら症例のX線像におけるβ-TCPの辺縁が不明瞭化する時期，骨梁の出現時期，β-TCPが吸収された時期について検討した．結果は，それぞれ平均4週，2.5カ月，6カ月であった．β-TCPは全例で比較的早期に新生骨に置換された．内軟骨腫の治療にβ-TCPを併用することは有用であると思われた．

　We used radiography to assess cases treated with β-TCP for enchondroma. The lesions selected were 5 fingers and one toe of 6 patients. Their average age was 45 years old, and the sites included 3 lesions in the proximal phalanx, 2 in the middle phalanx, and 1 in a metacarpal bone. The procedure was performed by sufficient filling with granular β-TCP after curettage. We used serial radioglaphs to investigate when the boundary of the β-TCP disappeared, when bone trabeculae appeared, and when the bone trabeculae became homogeneous, and the results showed that they occurred after an average of 4 weeks, 2.5 months, 6 months, respectively. β-TCP was relatively quickly replaced by newly formed bone in all cases. We concluded that β-TCP is useful for the treatment enchondroma,and may accelerate ossification and early improvement in bone strength.