Measurement of the bone mineral density in the tunnel region during the anterior cruciate ligament reconstruction

• DOI: 10.3760/cma.j.issn.0253-2352.2012.02.005
• Publication Date: 2012-02-01
• Authors: Kai Tie; Liaobin Chen; Hua Wang; Xin Wang
• Keywords: Cancellous bone

Objective To compare the bone mineral density of regions femoral and tibial tunnels for anterior cruciate ligament(ACL)reconstruction in order to provide reference choice optimal screw diameter interference fixation.Methods Thirty healthy volunteers aged from 18 35 years were enrolled our study,and dual-energy X-ray absorptiometry(DEXA)was used measure tunnel right knee.All knees also scanned by spiral CT three-dimensional reconstruction technique was utilized determine circular sections that pass through longitudinal axis separately.The gray scale values Sections measured.From August October 2010,9 patients who had been diagnosed as ACL rupture underwent operation reconstruction,and cylindrical cancellous peg removed respectively during operation.Volumetric pegs measured using a standardized immersion according Archimedes’ principle.Results Measured DEXA,bone region arid were(1.162±0.034)g/cm2 and(0.814±0.038)g/cm2 respectively.The difference significant between region(t=9.11,P=0.000).The value section was(211.7±11.5)Hu,while was(104.9±7.4)Hu.There statistically them(t=10.15,P=0.000).The volumetric were(2.80±0.88)g/cm3 and(1.88±0.59)g/cm3 significant(t=4.32,P=0.002).Conclusion For reconstruction,bone is higher than tunnel.

Key words: Bone density; Anterior ligament; Tomography, computed; Densitometry,X-ray