Jhamaria N L, Lal K B, Udawat M, Banerji P, Kabra S G
J Bone Joint Surg Br. 1983 Mar;65(2):195-8. doi: 10.1302/0301-620X.65B2.6826630.
Radiographs of the foot and hip in 61 patients with fractures of the upper end of femur have been studied, noting the progressive loss of bone trabeculae with age. The trabecular pattern in the calcaneum (expressed as the calcaneal index) closely parallels that in the upper end of the femur (Singh's index) and is easier to assess. Both indices have a significant correlation with age.
对61例股骨上端骨折患者的足部和髋部X光片进行了研究，记录了骨小梁随年龄增长而逐渐丢失的情况。跟骨的小梁模式（以跟骨指数表示）与股骨上端的小梁模式（辛格指数）密切平行，且更易于评估。这两个指数都与年龄有显著相关性。
