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Table 3 Comparison between survivors and failures. Failures were defined as knees who underwent conversion to total knee arthroplasty (TKA) or a Womac Score < 43

From: The lack of retropatellar resurfacing at index surgery is significantly associated with failure in patients following patellofemoral inlay arthroplasty: a multi-center study of more than 260 patients

Variable Non-failures (n = 235) Failures (n = 28) p-value
Age (years) 49 ± 12 47 ± 10 n.s
Body mass index (kg/m2) 26.2 ± 4.6 27.5 ± 3.8 p = 0.045*
Gender distribution    
 Male (n,%) 78 (33%) 7 (25%) n.s
 Female (n,%) 157 (67%) 21 (75%)
Concomitant procedures    p = 0.025*
 No (n,%) 205 (87%) 20 (71%)
 Yes (n,%) 30 (13%) 8 (29%)
Patellar resurfacing at index surgery    p = 0.000**
 No patellar resurfacing (n, %) 111 (47%) 23 (82%)
 Patellar resurfacing (primary) (n, %) 124 (53%) 5 (18%)
Patellar resurfacing    n.s
 No patellar resurfacing (n, %) 97 (41%) 14 (50%)
 Patellar resurfacing (primary and secondary) (n, %) 138 (59%) 14 (50%)
  1. The patellar resurfacing group was further subdivided between patients who underwent patellar resurfacing at index surgery (primary) and those who underwent implantation of patellar resurfacing as a revision surgery during further follow up (secondary)
  2. Mean values are given with ± standard deviation
  3. n number of patients, kg/m2 kilograms per square meter; n.s. not significant; % percent
  4. **p < 0.01; *p < 0.05
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