Official Journal of the Italian Society of Orthopaedics and Traumatology
Table 2 Diagnostic features of periprosthetic fractures (PPF)
Joint | Shoulder 32 (2.3) | Elbow 4 (0.3) | Hip 751 (54.1) | Knee 590 (42.5) | Ankle 10 (0.7) | |||
|---|---|---|---|---|---|---|---|---|
Bone n (%) | Humerus 32 (100) | Humerus 4 (100) | Pelvis 31 (4.1) | Femur 720 (95.9) | Femur 544 (92.2) | Tibia 41 (6.9) | Tibia 10 (100) | |
Method of fixation | ||||||||
 Uncemented | 16 (50) | 1 (25) | 495 (65.9) | 154 (26.1) | 1 (10) | |||
 Cemented | 16 (50) | 3 (75) | 255 (34) | 434 (73.6) | 9 (90) | |||
 N/A |  |  | 1 (0.1) | 2 (0.3) |  | |||
Presence of stem | ||||||||
 Stemless | 0 (0) | 1 (25) | 5 (16.1) | 64 (8.9) | 449 (82.5) | 24 (58.5) | 2 (20) | |
 Stem | 32 (100) | 3 (75) | 26 (83.9) | 655 (91) | 94 (17.3) | 17 (41.5) | 8 (80) | |
 N/A |  |  |  | 1 (0.1) | 1 (0.2) |  |  | |
Infection | ||||||||
 Negative | 29 (90.6) | 4 (100) | 31 (100) | 694 (96.4) | 526 (96.7) | 37 (90.2) | 8 (80) | |
 Positive | 3 (9.4) | 0 (0) | 0 (0) | 25 (3.5) | 18 (3.3) | 4 (9.8) | 2 (20) | |
 N/A |  |  |  | 1 (0.1) |  |  |  | |
Loose prosthesis | ||||||||
 Negative | 26 (81.2) | 2 (50) | 25 (80.6) | 578 (80.3) | 511 (93.9) | 36 (87.8) | 10 (100) | |
 Positive | 6 (18.8) | 2 (50) | 6 (19.4) | 140 (19.4) | 33 (6.1) | 4 (9.8) | 0(0) | |
 N/A |  |  |  | 2 (0.3) |  | 1 (2.4) |  | |
X-ray signs of loose prosthesis | ||||||||
 Negative | 25 (78.1) | 1 (25) | 30 (96.8) | 610 (84.7) | 506 (93) | 37 (90.2) | 9 (90) | |
 Positive | 7 (21.9) | 3 (75) | 1 (3.2) | 109 (15.1) | 37 (6.8) | 4 (9.8) | 1 (10) | |
 N/A |  |  |  | 1 (0.1) | 1 (0.2) |  |  | |
Painful prosthesis | ||||||||
 Negative | 22 (68.8) | 3 (75) | 26 (83.9) | 631 (87.6) | 455 (83.6) | 27 (65.9) | 8 (80) | |
 Positive | 10 (31.2) | 1 (25) | 5 (16.1) | 88 (12.2) | 88 (16.2) | 14 (34.1) | 2 (20) | |
 N/A |  |  |  | 1 (0.1) | 1 (0.2) |  |  | |
Time from arthroplasty to PPF (months)—no. (%) | ||||||||
  < 1 month | 2 (6.3) | 0 (0) | 1 (3.2) | 25 (3.5) | 6 (1.1) | 1 (2.4) | 1 (10) | |
 From 1 to < 6 months | 1 (3.1) | 0 (0) | 3 (9.7) | 34 (4.7) | 17 (3.1) | 5 (12.2) | 1 (10) | |
 From 6 to < 12 months | 0 (0) | 0 (0) | 2 (6.5) | 17 (2.4) | 11 (2) | 2 (4.9) | 1 (10) | |
 From 1 to < 5 years | 16 (50) | 1 (25) | 5 (16.1) | 101 (14) | 86 (15.8) | 5 (12.2) | 1 (10) | |
    ≥ 5 years | 11 (34.4) | 3 (75) | 20 (64.5) | 518 (71.9) | 407 (74.8) | 27 (65.9) | 5 (50) | |
   N/A | 2 (6.3) |  |  | 25 (3.5) | 17 (3.1) | 1 (2.4) | 1 (10) | |