Table 1.
Analysis of survival probability at 36 months and 60 months by variable demographic and radiographic parameters
| Parameter | Number of Hips | Conversion to THA | Survival Probability at 36 Months (SE) | Survival Probability at 60 Months (SE) | Log-rank test |
|---|---|---|---|---|---|
| Overall Study | 57 | 11 | 89.47% (4.06%) | 72.49% (9.28%) | |
| Gender# | P = 0.141 | ||||
| Male | 50 | 8 | 90.00% (0.42%) | 74.44% (10.97%) | |
| Female | 7 | 3 | 85.71% (13.23%) | 57.14% (18.70%) | |
| Age | P = 0.161 | ||||
| ≤ 50 years | 40 | 6 | 95.00% (3.45%) | 74.06% (12.45%) | |
| > 50 years | 15 | 5 | 76.47% (10.29%) | 70.59% (11.05%) | |
| Etiology | P = 0.982 | ||||
| Corticosteroid-related | 23 | 7 | 86.95% (70.20%) | 67.19% (10.50%) | |
| Idiopathic | 12 | 3 | 75.00% (0.2150%) | 75.00% (21.50%) | |
| Alcoholic | 17 | 1 | 1.0000% (0.0000%) | 75.00% (21.65%) | |
| Posttraumatic | 5 | 0 | 100.00% (0.00%) | 100.00% (0.00%) | |
| Chronic systemic disease | P = 0.081 | ||||
| Yes | 13 | 5 | 76.93% (11.69%) | 46.16% (20.69%) | |
| No | 44 | 6 | 93.18% (3.80%) | 83.10% (6.99%) | |
| Corticosteroid use | P = 0.099 | ||||
| Yes | 23 | 7 | 86.95% (7.02%) | 67.19% (10.50%) | |
| No | 34 | 4 | 91.17% (4.86%) | 75.97% (14.45%) | |
| Bilateral disease treated with Tantalum implant | P = 0.982 | ||||
| Unilateral | 32 | 6 | 93.74% (4.28%) | 79.93% (7.46%) | |
| Bilateral | 25 | 5 | 83.99% (7.33%) | 71.99% (12.76%) | |
| Preoperative Steinberg Stage | P = 0.094 | ||||
| I | 4 | 0 | 100.00% (0.00%) | 100.00% (0.00%) | |
| II | 22 | 5 | 90.91% (6.13%) | 75.97% (9.49%) | |
| III | 6 | 3 | 66.66% (19.24%) | 50.00% (20.41%) | |
| IVA | 25 | 3 | 92.00% (5.43%) | 46.00% (32.64%) | |
| Preoperative Harris hip score more than 80 points | P = 0.150 | ||||
| Yes | 8 | 0 | 100.00% (0.00%) | 100.00% (0.00%) | |
| No | 49 | 11 | 87.76% (4.68%) | 67.67% (10.78%) | |
| Bone marrow edema | P = 0.006 * | ||||
| Yes | 32 | 10 | 81.35% (6.99%) | 65.34% (9.54%) | |
| No | 25 | 1 | 85.71% (13.22%) | 85.71% (13.22%) | |
| Joint effusion | P = 0.015 * | ||||
| Yes | 34 | 10 | 82.35% (6.54%) | 67.40% (9.08%) | |
| No | 23 | 1 | 100.00% (0.00%) | 83.33% (15.21%) | |
| Preoperative collapse of the femoral head | P = 0.709 | ||||
| Yes | 26 | 5 | 92.31% (5.22%) | 79.32% (8.38%) | |
| No | 31 | 6 | 87.09% (6.61%) | 41.93% (29.83%) | |
| Extent of osteonecrotic lesion | P = 0.040 * | ||||
| Small and Medium (< 30%) | 19 | 7 | 94.74% (3.62%) | 69.08% (20.21%) | |
| Large (> 30%) | 38 | 4 | 78.95% (9.36%) | 62.20% (11.36%) | |
| Post-operative radiographic progression | P < 0.001 * | ||||
| Yes | 17 | 9 | 70.59% (11.05%) | 41.18% (13.60%) | |
| No | 40 | 2 | 97.50% (2.47%) | 95.00% (3.45%) |
THA: Total Hip Arthroplasty, SE: Standard Error.
*
P < 0.05 was considered significant.
Bold value indicate the significant P value.
#
gender reported as number of hips.