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Fig. 5 | BMC Musculoskeletal Disorders

Fig. 5

From: Conventional versus helical blade screw insertion following the removal of the femoral head screw: a biomechanical evaluation using trochanteric gamma 3 locking nail versus PFN antirotation

Fig. 5

When the C-type (C2) and H-type (H2) screws used as the following screws were compared with the original screws, (A, B) the resistance strength against pullout stress decreased in C2 significantly to < 50% overall compared with that for the original C and that decreased in H2 to < 30% overall compared with that of the original H; the differences were significant except for H1-H2 (PCF 10, p = 0.358). C, E the rotational strength for C2 significantly decreased compared with that for the original C in both CW (C) and CCW (E). In particular, the rotation strength compared with that for the original C decreased by > 50% in all other cases except for C1-C2 (CCW, 47.13%) in PCF 5 and C1-C2 (CW, 46.69%), H1-ROC2 (CCW, 47.76%), and H1-RXC2 (CCW, 43.41%) in PCF 15. D, F The rotational strength for H2 significantly decreased compared with that of the original H in both CW (D) and CCW (F), except for H1-H2 (PCF 5, CCW) and C1-RXH2 (PCF 10 and 15, CCW). In particular, the rotational strength compared with that of the original H decreased by < 30% in all cases

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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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