Influence of implant and screw type on local bone strain field: a preliminary study

Figures & data

Figure 1. Loading setups for DTN (a; head ø 5 mm, head length 3 mm), and ETN (b; ø 4 mm). Bone cortical thickness: 3.5 mm.

Figure 2. Qualitative strain ε_yy field for the DTN (a) and ETN (b) screws. Rainbow scale: purple (compression) to red (traction). The dashed lines show the boundaries of mean ±1 SD.

Table 1. Recorded values in the maximum negative (i.e., compressive) strain zone.

Screw type	εyy (µε) Mean (±SD) [MAX]	Angle (°) [range]	Bone remodelling? (Duncan and Turner 1995)
DTN	577 (± 48) [660]	76° [242 - 318]	Yes
ETN	285 (± 23) [326]	90° [40 – 130]	Yes

Duncan RL, Turner CH. 1995. Mechanotransduction and the functional response of bone to mechanical strain. Calcif Tissue Int. 57(5):344–358.

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