Holding Power of Orthopaedic Screws in Bovine Femoral Heads

1993 ◽  
Vol 06 (03) ◽  
pp. 160-162 ◽  
Author(s):  
M. J. Ulm ◽  
D. G. Wilson
Keyword(s):  
Femoral Head ◽  
Cannulated Screws ◽  
Cancellous Screw ◽  
Holding Power ◽  
Cortical Screw ◽  
Femoral Heads ◽  
Cancellous Screws ◽  
Physeal Fractures

SummaryFemoral capital physeal fractures have been successfully repaired using 7.0 mm cannulated screws. The holding power of 7.0 mm cannulated screws was compared to the holding power of 5.5 mm cortical screws and 6.5 mm cancellous screws using paired bovine femoral heads. The 7.0 mm cannulated screw’s holding power was superior to the 6.5 mm cancellous screw and similar to that of the 5.5 mm cortical screw.When placed in the bovine femoral head, 7.0 mm cannulated screws have holding power greater than 6.5 mm cancellous screws and similar to 5.5 mm cortical screws.

Holding Power of Orthopaedic Screws in Bovine Femoral Heads. A Comparison of Three Cannulated Screws

1996 ◽  
Vol 09 (03) ◽  
pp. 111-4
Author(s):  
R. P. McCabe ◽  
D. G. Wilson
Keyword(s):  
Stainless Steel ◽  
Femoral Head ◽  
Cannulated Screw ◽  
Cannulated Screws ◽  
Holding Power ◽  
Femoral Heads ◽  
Physeal Fractures

SummaryFemoral capital physeal fractures have been successfully repaired with 7.0 mm stainless steel cannulated screws. The holding power of 7.0 mm stainless steel cannulated screws, 8.0 mm stainless steel cannulated screws and 8.0 mm titanium cannulated screws was compared. The 8.0 mm titanium cannulated screw had the highest holding power, the 7.0 mm stainless steel cannulated screw was intermediate and the 8.0 mm stainless steel cannulated screw had the lowest holding power.When placed in the bovine femoral head, 8.0 mm titanium cannulated screws have holding power greater than 8.0 mm stainless steel cannulated screws. A 7.0 mm stainless steel cannulated screw has intermediate holding power.

Pullout Strength of Screws in Foal Third Metacarpal Bone after Overdrilling a 4.5 mm Hole

1998 ◽  
Vol 11 (04) ◽  
pp. 200-204 ◽  
Author(s):  
K. Kelly ◽  
G. S. Martin ◽  
D. J. Burba ◽  
S. A. Sedrish ◽  
R. M. Moore
Keyword(s):  
Cortical Bone ◽  
Metacarpal Bone ◽  
Pullout Strength ◽  
Cancellous Screw ◽  
Bone Screw ◽  
Screw Insertion ◽  
Holding Power ◽  
Cortical Screw ◽  
Metaphyseal Bone

SummaryThe purpose of the study was to determine and to compare the in vitro pullout strength of 5.5 mm cortical versus 6.5 mm cancellous bone screws inserted in the diaphysis and metaphysis of foal third metacarpal (MCIII) bones in threaded 4.5 mm cortical bone screw insertion holes that were then overdrilled with a 4.5 mm drill bit. This information is relevant to the selection of a replacement screw if a 4.5 mm cortical screw is stripped during orthopaedic surgery. In vitro pullout tests were performed in two independent cadaver studies, each consisting of 12 foal MCIII bones. Two 4.5 mm cortical screws were placed either in the mid-diaphysis (study 1) or distal metaphysis (study 2) of MCIII bones. The holes were then overdrilled with a 4.5 mm bit and had either a 5.5 mm cortical or a 6.5 mm cancellous screw inserted; screw pullout tests were performed at a rate of 0.04 mm/s until screw or bone failure occurred.The bone failed in all of the tests in the diaphyseal and metaphyseal bone. The holding power for 6.5 mm cancellous screws was significantly (p <0.05) greater than for 5.5 mm cortical screws in both the diaphysis and metaphysis. There was not any difference in the holding power of screws in either the diaphysis or the metaphysis between proximal and distal screw holes.If a 4.5 mm cortical bone screw strips in MCIII diaphyseal or metaphyseal bone of foals, a 6.5 mm cancellous screw would provide greater holding power than a 5.5 mm cortical screw.In order to provide information regarding selection of a replacement screw if a 4.5 mm cortical screw is stripped, the in vitro pullout strength was determined for 5.5 mm cortical and 6.5 mm cancellous screws inserted in third metacarpal diaphyseal and metaphyseal bone of foals in which threaded 4.5 mm cortical bone screw insertion holes had been overdrilled with a 4.5 mm bit. The holding power of the 6.5 mm cancellous screw was significantly greater than the 5.5 mm cortical screw in both the diaphysis and metaphysis of foal third metacarpal bone. Thus, it appears that if a 4.5 mm cortical screw is stripped during orthopaedic surgery in foals, a 6.5 mm cancellous screw would provide superior holding power.

Holding Power of 3.5 mm Versus 4.0 mm Screw Applications Placed in Stripped 2.7 mm Screw Sites

1998 ◽  
Vol 11 (03) ◽  
pp. 146-151 ◽  
Author(s):  
S. C. Kerwin ◽  
S. A. Sedrish ◽  
G. Hosgood ◽  
J. L. Oliver ◽  
K. Kelly ◽  
...  
Keyword(s):  
Mechanical Testing ◽  
Dynamic Compression ◽  
Plate Fixation ◽  
Post Mortem ◽  
Cancellous Screw ◽  
Dynamic Compression Plate ◽  
Holding Power ◽  
Pull Out ◽  
Cortical Screw ◽  
Compression Plate

SummaryMechanical stripping of orthopaedic screws is a complication that can occur during plate fixation of fractures. This report compares the holding power of 3.5 mm cortical and 4.0 mm cancellous orthopaedic screws inserted as a salvage technique in stripped 2.7 mm screw sites in cadaver bone. Both 3.5 mm and 4.0 mm orthopaedic screws were applied with and without tapping to stripped screw sites in the diaphysis of mature canine tibiae. Mechanical testing of the pull-out force required to extract these screws showed that all of the applications have comparative holding powers, but the 4.0 mm screw had significantly greater holding power when compared with the 3.5 mm screw. Tapping the stripped screw site, prior to placing the 3.5 mm or 4.0 mm screw, did not significantly affect the holding power. The 4.0 mm cancellous screw has the advantages of significantly greater holding power and less interference with the 2.7 mm dynamic compression plate, when compared to the 3.5 mm cortical screw.The holding power of 3.5 mm cortical and 4.0 mm cancellous orthopaedic screws placed tapped and untapped into 2.7 mm stripped screw sites in post-mortem canine tibiae were compared. All applications had comparable holding power, but with the 4.0 mm screw the holding power was significantly greater. Tapping stripped screw sites did not have any significant effect on holding power.

Impaction bone-grafting increases the holding power of cancellous screws in the femoral head : A pull-out study in human cadaver hips

1999 ◽  
Vol 70 (1) ◽  
pp. 25-28 ◽  
Author(s):  
Aleks Lenzner ◽  
Llmar Kaur ◽  
Tiit Haviko ◽  
Velio Sogel ◽  
Jelena Gapejeva ◽  
...  
Keyword(s):  
Femoral Head ◽  
Bone Grafting ◽  
Human Cadaver ◽  
Impaction Bone Grafting ◽  
Holding Power ◽  
Pull Out ◽  
Cancellous Screws

No Negative Influence On Complications of femoral neck fracture Children Age Between 14 And 17 Years Treatment with Cannulated Screws Transphyseal fixation

2020 ◽  
Author(s):  
Yang Liu ◽  
Xiao-Dan Zhao
Keyword(s):  
Femoral Head ◽  
Femoral Neck ◽  
Negative Influence ◽  
Coxa Vara ◽  
Rigid Fixation ◽  
Type Ii ◽  
Cannulated Screws ◽  
Type Iii ◽  
Femoral Head Osteonecrosis ◽  
Cancellous Screws

Abstract Background Hip fractures represent less than 1% of pediatric fractures. The physeal of femoral head closure at 14 to 17 years of age, and it provides capacity for spontaneous fracture remodeling. The primary purpose of the current retrospective study was to determine the influence of transphyseal fixation of cancellous screws on the outcomes in this age group. Methods: From April 2007 to August 2016, all patients age between 14 to 17 years with Delbet type II and Type III hip fracture treatment with cancellous screws fixation were included. According to whether the cancellous screws thread across the proximal femur epiphysis, we divided the patients into the no cross epiphysis (NCE) group and cross epiphysis (CE) group. The outcome was analysis regarding osteonecrosis of femoral head, nonunion, delay union, premature physeal closure (PPC), coxa vara and overgrowth of femoral neck. Results: Of the 28 patients were included in the study, most patients were male (92.9%).19 were classified as Delbet type II, 9 were type III. The CE and the NCE group both included 14 patients. The average follow-up time is 37.8 months (range 26-68 months). The rate of superficial infection, deep infection, AVN, non-union, delay union, coxa vara, PCE, overgrowth was not significantly different between the two groups. Conclusion: This study demonstrated that the transphyseal fixation of cannulated screws has no negative influence on the outcomes, especially on femoral head osteonecrosis. Achievement of accurate reduction and rigid fixation for this unique injury is more important than preservation of the proximal femoral epiphysis.

A comparison of 2 cementing techniques in hip resurfacing using human femoral heads

2021 ◽  
pp. 112070002199706
Author(s):  
Sarah J Shiels ◽  
Martin Williams ◽  
Gordon C Bannister ◽  
Richard P Baker
Keyword(s):  
Femoral Head ◽  
Femoral Component ◽  
Bubble Formation ◽  
Young Male ◽  
Cement Mantle ◽  
Hip Resurfacing ◽  
Air Bubble ◽  
Low Viscosity ◽  
Femoral Heads ◽  
Group 2

Introduction: Hip resurfacing remains a valid option in young male patients. The creation of the optimum cement mantle aids fixation of the femoral component. If the cement mantle is too thick the prosthesis can remain proud leading to early failure or if it penetrates too far into the femoral head, it may cause osteonecrosis. Method: 18 of 96 femoral heads collected from patients undergoing total hip arthroplasty were matched for their surface porosity. They were randomly allocated into 2 different cementing groups. Group 1 had the traditional bolus of cement technique, while group 2 had a modified cementing technique (swirl) where the inside of the femoral component was lined with an even layer of low viscosity cement. Results: The traditional bolus technique had significantly greater cement mantle thickness in 3 of 4 zones of penetration ( p = 0.002), greater and larger air bubble formation (6 of 9 in bolus technique vs. 1 in 9 in swirl technique, p = 0.05) and more incomplete cement mantles compared with the swirl technique. There was no relationship to femoral head porosity. Conclusion: The swirl technique should be used to cement the femoral component in hip resurfacing. Long-term clinical studies would conform if this translates into increased survivorship of the femoral component.

scholarly journals Microvascular Density of Rapidly Destructive Arthropathy of the Hip Joint

2005 ◽  
Vol 13 (1) ◽  
pp. 40-45 ◽  
Author(s):  
T Yamakawa ◽  
A Sudo ◽  
M Tanaka ◽  
A Uchida
Keyword(s):  
Femoral Head ◽  
Hip Joint ◽  
Joint Destruction ◽  
Bone Destruction ◽  
Microvascular Density ◽  
Blood Capillaries ◽  
Secondary Osteoarthritis ◽  
Femoral Heads ◽  
Formalin Fixed Paraffin Embedded ◽  
Destructive Arthropathy

Purpose. To assess the vascularity of the femoral head and determine how it is related to the destruction of the arthritic hip joint. The process of destructive arthropathy in arthritic hip joints is variable. Some patients with osteoarthritis of the hip have rapidly progressive destructive changes resulting in the disappearance of the femoral head. Method. Six femoral heads from patients diagnosed with rapidly destructive arthropathy and 6 femoral heads from patients with secondary osteoarthritis caused by acetabular dysplasia were analysed to reveal the association between blood capillaries and osteoclasts. The von Willebrand Factor immunostaining and counterstaining with Mayer's haematoxylin were used to label the microvessels and osteoclasts in formalin-fixed, paraffin-embedded specimens of femoral heads. The numbers of immunostained microvessels and osteoclasts in selected regions were counted. Result. The microvascular density of the bone surfaces of rapidly progressive arthritic hips was hypervascular. Osteoclasts were also found in increased numbers on the bone surfaces of rapidly progressive arthritic hips. The higher microvascular density coincided with extensive bone destruction and with the increased osteoclast count. Conclusion. These findings suggested that hypervascularity of the granulation in the femoral head may be associated with bone and joint destruction.

Recent Methods of Neck Femur Fixation A Systematic review and meta-analysis

QJM ◽  
2021 ◽  
Vol 114 (Supplement_1) ◽  
Author(s):  
Ahmed Salem Eid ◽  
Ahmed Mohamed Mohasseb ◽  
Ramy Mohamed Mohamed El-Bahnasy
Keyword(s):  
Systematic Review ◽  
Femoral Head ◽  
Femoral Neck ◽  
High Energy ◽  
Femoral Neck Fractures ◽  
Final Outcome ◽  
Cannulated Screws ◽  
Fixed Angle ◽  
Femur Fractures ◽  
Femoral Head Osteonecrosis

Abstract Background Femoral neck fractures in adults younger than age 50 years are uncommon and often the result of high energy trauma. They account for only 2-3% of all femoral neck fractures. Femoral neck fractures are associated with aging and osteoporosis and can occur after relatively trivial trauma in elderly patients. femoral neck fractures are associated with higher incidences of femoral head osteonecrosis and nonunion. Fixation options include cannulated screws, non parallel cannulated screws, medial augmentation plate, and fixed angle femoral neck fixation implants. A systematic review of literature done to evaluate which technique is better. Methods After literature search thirteen articles were found and were reviewed to evaluate final outcome of fixation of neck femur fractures by cannulated screws, non parallel cannulated screws, medial augmentation plate, and fixed angle femoral neck fixation implants. Results After evaluation of all studies the incidence of nonunion, osteonecrosis of femoral head, implant failure & revesion surgery is lower in comparing Targon plate with multiple cannulated screws while we need further studies for application of non parallel screws and medial plate. Conclusion Targon plate recorded low incidence of complications in the final outcome in comparison with multiple cannulated screw while we need further studies for application of Non parallel screws and medial plate.

Femoral head material loss at the head-neck junction in total hip arthroplasty: the effect of head size, stem material and stem offset

2018 ◽  
Vol 29 (6) ◽  
pp. 647-651 ◽  
Author(s):  
Giuseppe Valente ◽  
Brent Lanting ◽  
Steven MacDonald ◽  
Matthew G Teeter ◽  
Douglas Van Citters ◽  
...  
Keyword(s):  
Femoral Head ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Head Size ◽  
Material Loss ◽  
Total Hip ◽  
Femoral Heads ◽  
Measuring Machine ◽  
Head Neck ◽  
Neck Junction

Introduction:Material loss at the head-neck junction in total hip arthroplasty may cause adverse clinical symptoms and implant failure. The purpose of this study was to quantitatively examine the effects of head size, stem material and stem offset on material loss of the head-neck taper interface of a single trunnion design in retrieval implants of metal on polyethylene bearing surfaces.Methods:A retrieval study was performed to identify all 28-mm and 32-mm femoral heads from a single implant/taper design implanted for >2 years. This included n = 56 of the 28-mm heads and n = 23 of the 32-mm heads. The 28-mm femoral heads were matched to 32-mm femoral heads based on time in vivo and head length. A coordinate measuring machine was used to determine maximum linear corrosion depth (MLD). Differences in MLD for head diameter, stem material, and stem offset were determined.Results:There were no differences between groups for age, gender, BMI, or implantation time. There was no difference in MLD between 28 mm and 32 mm matched paired head diameters ( p = 0.59). There was also no difference in MLD between titanium or cobalt-chromium stems ( p = 0.79), and regular or high-offset stems ( p = 0.95).Conclusion:There is no statistical difference in femoral head MLD at the head-neck junction in THA between 28-mm and 32-mm matched paired femoral heads, similar or mixed alloy coupled femoral head stem constructs, and regular or high offset stems.

scholarly journals Comparison of early clinical results for the femoral neck system and cannulated screws in the treatment of unstable femoral neck fractures

2021 ◽  
Author(s):  
Xiaoqiang Zhou ◽  
Zhiqiang Li ◽  
Renjie Xu ◽  
Yuanshi She ◽  
Xiangxin Zhang ◽  
...  
Keyword(s):  
Femoral Head ◽  
Femoral Neck ◽  
Blood Loss ◽  
Hospital Stay ◽  
Clinical Efficacy ◽  
Operation Time ◽  
Femoral Neck Fractures ◽  
Femoral Head Necrosis ◽  
Cannulated Screws ◽  
Intraoperative Blood Loss

Abstract Objective: To compare early clinical effects of the femoral neck system (FNS) and three cannulated screws for the treatment of patients with unstable femoral neck fractures.Methods: A retrospective analysis with pair matching of 81 patients who received FNS or cannulated screw internal fixation for Pauwels type-3 femoral neck fracture in our hospital from January 2019 to December 2019 was conducted. Patients who received FNS were the test group, and those who received cannulated screws comprised the control group. Matching requirements were as follows: same sex, similar age and similar body mass index (BMI). A total of 30 pairs were successfully matched, and the average age was 53.84 years. The operation time, intraoperative blood loss, hospital stay, hospitalization cost, postoperative visual analogue scale (VAS) score, time to walking without crutches, Harris score, femoral head necrosis rate and complication rate were compared between the groups.Results: Postoperative re-examination of radiographs showed satisfactory reduction in all patients, and all patients were followed up for 10-22 months. Those in the FNS group had lower postoperative VAS scores, earlier times to walking without crutches, higher Harris scores at the last follow-up and lower complication rates (P<0.05). However, intraoperative blood loss and hospitalization costs were greater in the FNS group (P<0.05). No statistically significant difference in operation time, hospital stay or femoral head necrosis rate was observed between the two groups (P>0.05).Conclusion: For patients with unstable femoral neck fractures, FNS has better clinical efficacy than cannulated screws, though it is also more expensive. The excellent biomechanical performance and clinical efficacy of FNS make it a new choice for the treatment of unstable femoral neck fractures.

Sign in / Sign up

Export Citation Format

Share Document