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Table 2 Outcome parameters

From: Bone restoration after revision hip arthroplasty with femoral bone defects using extensively porous-coated stems with cortical strut allografts

ParametersAllografts group (n = 47)No allografts group (n = 75)P value
Area of stress shielding0.599
 Small28 (59.5%)41 (54.7%) 
 Moderate13 (27.7%)23 (30.7%) 
 Large6 (12.8%)11 (14.7%) 
Severity of stress shielding0.01
 Mild40 (85.1%)48 (64.0%) 
 Moderate5 (10.6%)16 (21.3%) 
 Severe2 (4.3%)11 (14.7%) 
Distal cortical hypertrophy14 (29.8%)29 (38.7%)0.318
Bone restoration in the defect area< 0.001
 Osseous restoration30 (63.8%)23 (30.7%) 
 Constant defects12 (25.5%)30 (40.0%) 
 Increasing defects5 (10.6%)22 (29.3%) 
Femoral width (mm)*
 Pre-operation31.7 ± 4.4 (22.6–38.0)32.2 ± 5.1 (23.9–39.4)0.457
 Immediate post-operation42.1 ± 6.5 (29.9–55.6)32.3 ± 5.0 (23.8–39.4)< 0.001
 Latest follow-up38.6 ± 7.2 (25.3–57.7)31.2 ± 6.5 (22.3–42.5)< 0.001
Fixation and stability of the stems0.672
 Stable bone ingrowth40 (85.1%)59 (78.7%) 
 Stable fibrous ingrowth6 (12.8%)14 (18.7%) 
 Unstable1 (2.1%)2 (2.7%) 
Re-revision2 (4.3%)3 (4.0%)0.945
 PJI0 (0%)1 (1.3%) 
 AL1 (2.1%)2 (2.7%) 
 PFF1 (2.1%)0 (0%) 
HHS
 Preoperative points41.2 ± 10.743.7 ± 9.90.281
 Postoperative points84.6 ± 6.084.8 ± 6.60.495
Complications4 (8.5%)5 (6.7%)0.705
 Intraoperative fracture2 (4.3%)3 (4.0%) 
 Wound infection1 (2.1%)0 (0%) 
 Postoperative dislocation1 (2.1%)2 (2.7%) 
  1. *P value was analyzed by the paired t test