Table 1 Demographics of study population
The baseline | Final follow-up | |||
|---|---|---|---|---|
N of knees (patients) | 125 | 119 | 41 | 39 |
Age (median, range) | 71.7 | 31.2–95.3 | 67.1 | 42.0–85.1 |
Body mass index (median, range) | 29.3 | 18.8–52.0 | 30.6 | 23.1–43.0 |
Follow-up, years (median, range) | 6.2 | 0.0–12.7 | 7.3 | 4.0–12.7 |
Females (knees, %) | 91 | 73% | 30 | 73% |
Number of previous knee surgeries (median, range)a | 2 | 1–6 | 2 | 1–5 |
Indications for revision RHK (knees), N (%) | ||||
Instability | 54 | 43.2% | 22 | 53.7% |
Prosthetic joint infection | 26 | 20.8% | 6 | 14.6% |
Loosening, wear and osteolysis | 20 | 16.0% | 3 | 7.3% |
Periprosthetic fracture | 11 | 8.8% | 3 | 7.3% |
Complication of the extensor mechanismb | 7 | 5.6% | 2 | 4.9% |
Malalignment | 6 | 4.8% | 4 | 9.8% |
Arthrofibrosis | 1 | 0.8% | 1 | 2.4% |
Stability of patella preoperatively, N (%) | ||||
Stable | 66 | 52.8% | 21 | 51.2% |
Subluxation | 11 | 8.8% | 3 | 7.3% |
Chronic dislocation | 11 | 8.8% | 5 | 12.2% |
Fragmentation/Demineralization | 4 | 3.2% | 2 | 4.8% |
Girdlestone/Spacer/Flap | 4 | 3.2% | 1 | 2.4% |
Fracture | 3 | 2.4% | 1 | 2.4% |
Instability of knee, N (%) | ||||
Antero-Posterior | 47 | 37.6% | 15 | 36.6% |
Medio-Lateral | 82 | 65.6% | 28 | 68.3% |
Pre-revision bone defects (AORI, N (%))c | ||||
Tibia | ||||
grade 1 | 87 | 69.6% | 30 | 73.2 |
grade 2a | 12 | 9.6% | 5 | 12.2% |
grade 2b | 11 | 8.8% | 3 | 7.3% |
grade 3 | 15 | 12.0% | 3 | 7.3% |
Femur | ||||
grade 1 | 90 | 72.0% | 34 | 82.9% |
grade 2a | 10 | 8.0% | 2 | 4.9% |
grade 2b | 9 | 7.2% | 1 | 2.4% |
grade 3 | 16 | 12.8% | 4 | 9.8% |