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Forschungsdatenbank PMU-SQQUID

Evaluation of risk for secondary fracture after removal of a new femoral neck plate for intracapsular hip fractures.
Eberle, S; Wutte, C; Bauer, C; von Oldenburg, G; Panzer, S; Augat, P;
J Orthop Trauma. 2011; 25(12): 721-725.
Originalarbeiten (Zeitschrift)


Augat Peter
Panzer Stephanie
Wutte Christof


Objective: To determine whether a new femoral neck plate has a higher risk for secondary fracture after implant removal than the current standard treatment for intracapsular hip fractures. Methods: Six pairs of human cadaver femora (age, 56 6 5.6 years; range, 48-64 years; two female and four male donors) were instrumented with the femoral neck plate (FNP) or the compression hip screw combined with an antirotation screw (CHS) in a paired study design. After removal of the implants, axial compression tests to failure of the bones were conducted. Maximum force to failure of the bones after implant removalwas determined. Axial stiffness of the bones before surgery and after implant removal was determined. Results: The FNP resulted in a mean failure load of 4687 6 1743 N (mean 6 standard deviation) and the CHS resulted in a mean failure load of 489261608 N with no significant difference between the two implant groups (P = 0.405). There was no significant difference in stiffness (P = 0.214) between the FNP (1240 6 362 N/mm) and the CHS (1293 6 304 N/mm). The cavities left by the surgery had no effect on the bone stiffness (P. 0.05). The mean failure load of all specimens correlated with the bone mineral density in the proximal part of the femurs by R 2 = 0.715 (P = 0.001). Conclusion: The FNP demonstrated a similar failure load after implant removal compared with the CHS, although the FNP left a 39% larger cavity in the bone.

Useful keywords (using NLM MeSH Indexing)

Bone Plates*

Bone Screws



Equipment Failure Analysis*


Femoral Neck Fractures/etiology*

Fracture Fixation, Internal*/adverse effects

Fracture Fixation, Internal*/instrumentation

Hip Fractures/surgery*


Intra-Articular Fractures/surgery*


Middle Aged

Reoperation/adverse effects

Stress, Mechanical

Find related publications in this database (Keywords)

femoral neck plate
secondary fracture
implant removal
in vitro
biomechanical test