Biomechanical comparison of Vancouver C type periprosthetic femoral fractures Fixed with Locking Plate Of Different Length
Bibliographic record
Abstract
Objective Comparing the biomechanical differences of four different locking plate fixation of different lengths in the treatment of Vancouver C type periprosthetic femoral fractures, the relationship between the position of locking plates relative to the distal end of the femoral stem and the stiffness and stress concentration was analyzed. Methods Ten pairs of fresh adult femoral specimens were randomly divided into four groups. Then, the modle of Vancouver C type periprosthetic femoral fractures was established. Fixed with locking plates of four different lengths: in group A, the proximal bicortical locking screw of the plate was 1 femoral diameter to the tip of the prosthesis; in group B, the proximal bicortical locking screw of the plate was the same level with the tip of the prosthesis; in group C, the proximal single cortical locking screw of the plate overlapped with the tip of the prosthesis by 1 femoral diameter; in group D, the proximal single cortical locking screw of the plate overlapped with the tip of the prosthesis by 2 femoral diameter. All of the models are performed by axial ballast test, torsion test, four-point bend test inside and outside, and four-point bend test front and behind. The data of each group were recorded and analyzed statisticallyby SPSS software. Finally, the cyclic loading test was carried out and the fracture line distribution was recorded. Results The stiffness of each group showed significant difference, and the stiffness of group D were the largest in all tests (P<0.05). In the cyclic loading experiment, the fracture of group D were distributed near the tips of femoral prosthesis, proximal locking nails and distal plates. The fracture of group A and C were concentrated between proximal locking nails and the tips of femoral prosthesis. The fracture of group B were concentrated in the linear region between the tips of femoral prosthesis and the tips of steel plates. The results showed that the stress concentration of group D was lower than that of group A, B and C (P<0.05). Conclusions In the treatment of Vancouver Ctype periprosthetic femoral fractures with locking plate, the stability of internal fixation increases with the plate length; the overlapping fixation of locking plate and the tip of femoral stem does not increase the stress concentration, and the stress is significantly dispersed, with increasing with the overlapping area of plate and femoral prosthesis. Key words: Periprosthetic femoral fracture; Vancouver Type C; Biomechanics; Locking plate
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".