Biomechanical Analysis of Location of Lag Screw of a Dynamic Hip Screw in Treatment of Unstable Intertrochanteric Fracture

1996 ◽  
Vol 41 (4) ◽  
pp. 699-702 ◽  
Author(s):  
Chi-Chuan Wu ◽  
Chun-Hsiung Shih ◽  
Ming-Yih Lee ◽  
Ching-Lung Tai
Keyword(s):  
Intertrochanteric Fracture ◽  
Dynamic Hip Screw ◽  
Biomechanical Analysis ◽  
Lag Screw ◽  
Unstable Intertrochanteric Fracture ◽  
Hip Screw

scholarly journals Dynamic Hip Screw with Trochanter-Stabilizing Plate Compared with Proximal Femoral Nail Antirotation as a Treatment for Unstable AO/OTA 31-A2 and 31-A3 Intertrochanteric Fractures

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Chun-Wei Fu ◽  
Ji-Ying Chen ◽  
Yueh-Ching Liu ◽  
Kuang-Wen Liao ◽  
Yung-Chang Lu
Keyword(s):  
Intertrochanteric Fracture ◽  
Operation Time ◽  
Dynamic Hip Screw ◽  
Proximal Femoral Nail ◽  
Intertrochanteric Fractures ◽  
Residual Pain ◽  
Unstable Intertrochanteric Fracture ◽  
Hip Screw ◽  
Proximal Femoral Nail Antirotation ◽  
Im Nailing

Background. The dynamic hip screw (DHS) with the addition of an angular stable trochanter-stabilizing plate (TSP) has been considered the ideal treatment for the unstable intertrochanteric fracture type. However, there have been few comparisons between DHS+TSP augmentation with intramedullary (IM) nailing. The aim of this retrospectively registered study was to compare the clinical outcomes of patients with the unstable type of intertrochanteric fractures treated with DHS+TSP or IM nailing (proximal femoral nail antirotation (PFNA)). Methods. From June 2013 to April 2018, 358 patients with proximal femur fracture AO/OTA type 31A2 and 31A3 treated with PFNA or DHS+TSP and followed for ≥10 months postoperatively were included. The surgical-dependent outcome evaluation included the operation time, intraoperative blood loss, postoperative decrease in hemoglobin, and blood transfusion amount. Functional status was also measured. Radiographic findings and postoperative complications were recorded and analyzed. Result. The operation time was significantly shorter in the DHS+TSP group than that in the PFNA group for both A2 and A3 fractures (A2 type: 84.0 vs.96.4 min; p<0.05; A3 type: 102.4 vs.116.1 min; p<0.05). Postoperative decrease in hemoglobin was more significant in the PFNA group than that in the DHS+TSP group for both fracture types (A2 type: −1.88 vs. −1.29 (mg/dL); p<0.05; A3 type: −1.63 vs. −1.04 (mg/dL); p<0.05). However, the patients treated with DHS+TSP had significantly more residual pain than those treated with PFNA during the final follow-up (Visual Analog Scale score, A2 type: 28.4 vs.23.2; p<0.05; A3 type: 27.5 vs.23.6; p<0.05) and complained of greater implant irritation. Conclusion. We found that DHS+TSP was associated with less operation time and less postoperative decrease in hemoglobin but more residual pain and implant irritation than those of PFNA. As a treatment for unstable intertrochanteric fracture, DHS+TSP provided ideal surgical outcomes which were not inferior to the PFNA.

Biomechanical analysis of the treatment of intertrochanteric hip fracture with different lengths of dynamic hip screw side plates

2020 ◽  
Vol 28 (6) ◽  
pp. 593-602
Author(s):  
Cheng-Chi Wang ◽  
Cheng-Hung Lee ◽  
Ning-Chien Chin ◽  
Kun-Hui Chen ◽  
Chien-Chou Pan ◽  
...  
Keyword(s):  
Hip Fractures ◽  
Dynamic Hip Screw ◽  
Biomechanical Analysis ◽  
Element Analysis ◽  
Side Plate ◽  
Lag Screw ◽  
Pull Out ◽  
Cortical Screw ◽  
Hip Screw ◽  
Biomechanical Effect

BACKGROUND: Dynamic hip screw (DHS) is a common implant used to treat stable-type intertrochanteric hip fractures. There are many factors that can affect the success rate of the surgery, including the length of side plates. It is therefore important to investigate the biomechanical effect of different DHS side plates on bones. OBJECTIVE: In order to reduce the likelihood of an implant failure, the aim of this study was to use finite element analysis (FEA) to investigate and understand the effect of side plates with different lengths in DHS. METHODS: In this FEA study, a 3D model with cortical bone, cancellous bone, side plate, lag screw, and cortical screws to simulate the implantation of DHS with different lengths of side plate (2-hole, 4-hole, and 6-hole) for intertrochanteric hip fractures was constructed. The loading condition was used to simulate the force (400 N) on the femoral head and the stress distribution on the lag screw, side plate, cortical screws, and femur was measured. RESULTS: The highest stress points occured around the region of contact between the screw and the cortical bones. The stress on the femur at the most distal cortical screw was the greatest. The shorter the length of the side plate, the greater the stress on the cortical screws, resulting in an increased stress on the femur surrounding the cortical screws. CONCLUSIONS: The use of DHS with 2-hole side plate may increase the risk of side plate pull-out. The results of this study provide a biomechanical analysis for selection of DHS implant lengths that can be useful for orthopaedic surgeons.

scholarly journals Functional and Radiological Outcome of Unstable Intertrochanteric Fracture Post Dynamic Hip Screw Fixation

Cureus ◽  
2019 ◽  
Author(s):  
Muhammad T Lakho ◽  
Asif A Jatoi ◽  
Muhammad Azfar ◽  
Aijaz Ali ◽  
Safiya Javed ◽  
...  
Keyword(s):  
Intertrochanteric Fracture ◽  
Screw Fixation ◽  
Dynamic Hip Screw ◽  
Radiological Outcome ◽  
Unstable Intertrochanteric Fracture ◽  
Hip Screw

scholarly journals Intertrochanteric fracture fixation with Dynamic Hip Screw: Is tip-apex distance measurement useful for predicting fixation failure?

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Goh KL ◽  
Zamzuri Z ◽  
Mohd Ariff S ◽  
Mohamed Azril MA
Keyword(s):  
Intertrochanteric Fracture ◽  
Demographic Data ◽  
Dynamic Hip Screw ◽  
Optimal Placement ◽  
Fixation Failure ◽  
Lag Screw ◽  
Hip Screw ◽  
Tip Apex Distance ◽  
One Year

Introduction: Application of dynamic hip screw (DHS) implant for the treatment of unstable intertrochanteric fractures continues to raise concern related to risk of lag screw cut-out with or without subsequent damage to the acetabulum. Measurement of tip-apex distances (TAD) has been recommended to guide the optimal placement of lag screw and to predict subsequent risk of screw cut-out. In this study, the value of TAD was evaluated to verify its usefulness. Methods: This is a retrospective study of 33 consecutive patients with intertrochanteric fracture treated with DHS. Demographic data of the patients were traced from their case notes. Post-operative radiographs were reviewed by focusing on measurement of TAD on anteroposterior and lateral radiographs. Radiographs at one year follow-up were reviewed to depict any fixation-related failure or complication. Results: Fifty two percent of patients did not achieved the recommended TAD of ≤ 25mm. The mean post-operative TAD was 25.9mm and elderly patients were likely to achieve TAD of ≤ 25mm. The overall complication rate of 6% was attributed to screw cut-out in two cases. The unstable left-sided fracture was identified to be a potential risk for screw cut-out or migration. Conclusion: TAD is a valuable measurement to guide optimal placement of lag screw during DHS fixation of intertrochanteric fracture.

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