Anatomic parameters of the screw channel in the posterior margin of the obturator
FENG Kai，CAO Sheng-lu，GUO Dong-hong, LING Wei，PENG Geng，WANG Gang
Chinese Journal of Clinical Anatomy ›› 2017, Vol. 35 ›› Issue (3) : 256-260.
Anatomic parameters of the screw channel in the posterior margin of the obturator
Objective To provide evidence of anatomy for the placement of screws in the screw channel in the posterior margin of the obturator. Methods CT scan data of 50 normal adults was collected for the reconstruction of three-dimensional hemi-pelvic models. The screw channel of each pelvis was confirmed using a novel method of axial perspective. After successful implantation of a virtual screw, the entry point and entry angle were measured. The data were verified on 13 bony hemi-pelvic specimens. Results The mean maximum screw diameter was （6.48±1.07）mm in male and （5.87±1.34）mm in female; the mean maximum screw length was （98.03±4.08）mm in male and （87.34±4.76）mm in female. The average OA value was （7.93±2.30）mm in male and (3.77±1.37）mm in female; the average AB value was （55.99±4.83）mm in male and （63.66±4.74）mm in female. The average ∠θ was （79.17±9.89）° in male and （71.81±10.61）°in female, while the average ∠ψ was （108.72±6.13）° in male and （98.12±7.43）°in female. All the parameters were statistically significant (P<0.05). A Kirschner wire with a diameter of 3.5 mm was successfully implantedin each of the 12 hemi-pelvic bony specimens among 13 hemi-pelvic bony specimens. Conclusions It’s feasible to implant a lag screw, which is at least 3.5 mm in diameter, into the screw channel in the posterior margin of the obturator. The parameters can be used for the design of the targeting device for this screw channel.
Acetabular fracture; / Bony channel in posteromarginalobturator / Imaging, three-dimensional; Anatomy
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