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Table 4
Geometric, processing, and cost parameters for anodized hip stem implant (n = 1 model case).
| Parameter | Value | Notes/assumptions |
|---|---|---|
| Implant type | Hip stem | Ti–6Al–4V alloy, cylindrical approximation |
| Length (mm) | 250 | Typical orthopedic stem length |
| Diameter (mm) | 25.4 | Matches standard clinical hip stems |
| Volume (cm3) | 507 | Based on cylindrical geometry |
| Mass (g) | 2246 | Using density ρ = 4.43 g/cm3 |
| Surface area (cm2) | 367 | Plasma-sprayed roughened surface area |
| Target anneal temp (∘C) | 350 | For amorphous → anatase conversion |
| Heating time (min) | 5 | Rapid annealing cycle |
| Energy cost/implant (USD) | 0.014 | At $0.12/kWh, batch processing conditions |
| Labor cost/implant (USD) | 1.00 | Assumed single operator/batch cycle |
| Capital cost/implant (USD) | 0.20 | Equipment depreciation estimate |
| Total cost/implant (USD) | 3.21 | Sum of energy, labor, and capital components |
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