Table 2.
The results using highly crosslinked polyethylene: a followup interval of 10 years in patients younger than 50 years and older than 50 years
| Study | Number of patients/number of hips | Bearing type | Mean age at index surgery (years) | Length of followup (years) | Number revised | Wear (mm/year) | Complications |
|---|---|---|---|---|---|---|---|
| Patients 50 years of age or younger | |||||||
| Kim et al.* [25] | 57/67 | Alumina HXLPE | 28 (30 and younger) | 11 | 0 | 0.031 ± 0.004 (mean ± SD) (includes bedding-in period) | 1 dislocation |
| Babovic and Trousdale† [1] | 50/54 | CoCr HXLPE | 39 (50 and younger) | Minimum 10 | 1 | 0.02 ± 0.0047 (mean ± SD) (did not state if includes bedding-in period) | 1 dislocation |
| Current study† | 95/105 | CoCr, oxidized zirconium, and ceramic HXLPE | 42 (50 and younger) | 12 (range, 9–14) | 1 | 0.022 (95% CI, 0.015–0.030) (excludes bedding-in) | 3 intraoperative fracture 1 DVT |
| Kim et al.* [24] | 100 pts | C on C, ceramic on HXLPE | 44 (50 and younger) | 12 (minimum 11) | 1 | 0.031 ± 0.004 (mean ± SD) (includes bedding-in period) | 5% squeaking or clicking hips |
| Kim et al.* [22] | 76/79 | Alumina HXLPE | 46 | 9 (range, 7–9) | 0 | 0.05 ± 0.02 (mean ± SD) (includes bedding-in period) | 1 dislocation |
| Patients older than 50 years of age | |||||||
| Ranawat et al.‡ [37] | 91/112 | CoCr HXLPE | 52 (range, 21–65) | 6 (range, 5–7.7) | 0 | 0.043 (± 28 SD) | NR |
| Johanson et al. [21]§ | 51/52 | CoCr and HXLPE, CoCr and conventional PE (Durasul; Zimmer) | 55 | 10 | 1 each group | RSA | 5/61 stem (8%) revision |
| Bedard et al.* [2] | 139/150 | CoCr HXLPE | 56 (range, 25–91) | Minimum 10 | 0 | 0.05 (includes bedding-in period) | 0 |
| Bragdon et al.† [4] | 159/174 | CoCr HXLPE | 60 | 7–13 | NR | Minimum 7-year followup: 0.018 ± 0.079 (mean ± SD) Minimum 10-year followup: 0.01 ± 0.0562 (mean ± SD) (excludes 1-year bedding-in period) |
0 |
| Engh et al.* [12] | 116/116 | CoCr versus HXLPE or conventional polyethylene | 63 | 10.0 ± 1.8 | None for wear in the HXLPE group, 2 for dislocation | 0.04 ± 0.06 (mean ± SD) (includes bedding-in period) | 2 dislocations |
| Garcia-Rey et al.* [14] | 45/45 | CoCr HXLPE | 67 | Minimum 10 | 0 | 0.02 ± 0.016 (mean ± SD) (includes bedding-in period) | NR |
| Glyn-Jones et al.† [17] | 39/39 | CoCr HXLPE | 68 (range, 52–76) | Minimum 10 | 0 | 0.033 | NR |
Methods of crosslinking: * 5 Mrad of gamma irradiation and heated; sterilized with gas plasma (Marathon; DePuy, Warsaw, IN, USA); †10 Mrad of gamma beam irradiation and heat-treated; sterilized with gas plasma (Longevity; Zimmer, Warsaw, IN, USA); ‡7.5 Mrad irradiation and heat-treated; sterilized to 3 Mrad in nitrogen (Crossfire; Stryker, Kalamazoo, MI, USA); §9.5 Mrad of electron-beam irradiation, melted and annealed; sterilized in ethylene oxide (Durasul; Zimmer, Warsaw, IN, USA); HXLPE = highly crosslinked polyethylene; CoCr = cobalt-chromium; C on C = ceramic on ceramic; PE = polyethylene; NR = not reported; CI = confidence interval; RSA = radiostereometric analysis; DVT = deep vein thrombosis.