Computer-assisted spherical osteotomy with a curved-bladed Tuke Saw®

Figures & data

Figure 1. Rotational acetabular osteotomy (spherical type) with a conventional curved chisel.

Figure 2. Curved-bladed Tuke Saw fitted with a tracker for the optical navigation system.

Figure 3. Hemispherical osteotomy with curved-bladed Tuke Saw® (left) or curved chisel (right) under optical navigation.

Figure 4. Evaluation of actual osteotomy surface.

Figure 5. Distance error of actual osteotomy surface from planned sphere in Sawbones® block experiment.

Table I.  Procedure time, volume of bone loss, and thickness of bone loss for hemispherical osteotomy in the Sawbones® block experiment (mean ± SD)

	Tuke Saw®	Chisel	p value
Procedure time (min)	7.8 ± 3.3	20.6 ± 9.1	< 0.05
Volume of bone loss (cm^3)	23.2 ± 6.3	7.0 ± 4.3	< 0.05
Thickness of bone loss (mm)	1.5 ± 0.4	0.45 ± 0.27	< 0.05

Table II.  RMS of distance error of osteotomy surface from planned sphere, and procedure time for rotational acetabular osteotomy of cadaveric pelves (mean ± SD).

	Tuke Saw®	Chisel	p value
RMS of distance error from plan (mm)	2.5 ± 0.5	3.5 ± 0.9	< 0.05
Procedure time (min)	18.6 ± 4.7	20.4 ± 3.2	0.14