scholarly journals In Vivo Damage of the Head-Neck Junction in Hard-on-Hard Total Hip Replacements: Effect of Femoral Head Size, Metal Combination, and 12/14 Taper Design

Materials ◽  
2017 ◽  
Vol 10 (7) ◽  
pp. 733 ◽  
Author(s):  
◽  
◽  
◽  
◽  
◽  
...  
Keyword(s):  
Femoral Head ◽  
Head Size ◽  
Femoral Head Size ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Hip Replacements ◽  
Head Neck ◽  
Neck Junction

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.

Robotic-Arm Assisted Total Hip Arthroplasty Results in Smaller Acetabular Cup Size in Relation to the Femoral Head Size: A Matched-Pair Controlled Study

2017 ◽  
Vol 27 (2) ◽  
pp. 147-152 ◽  
Author(s):  
Carlos Suarez-Ahedo ◽  
Chengcheng Gui ◽  
Timothy J. Martin ◽  
Sivashankar Chandrasekaran ◽  
Parth Lodhia ◽  
...  
Keyword(s):  
Femoral Head ◽  
Head Size ◽  
Robotic Arm ◽  
Matched Pair ◽  
Femoral Head Size ◽  
Acetabular Cup ◽  
Acetabular Bone ◽  
Head Diameter ◽  
Total Hip ◽  
Femoral Head Diameter

Purpose To compare the acetabular component size relative to the patient's native femoral head size between conventional THA (CTHA) approach and robotic-arm assisted THA (RTHA) to infer which of these techniques preserved more acetabular bone. Methods Patients were included if they had primary osteoarthritis (OA) and underwent total hip replacement between June 2008 and March 2014. Patients were excluded if they had missing or rotated postoperative anteroposterior radiographs. RTHA patients were matched to a control group of CTHA patients, in terms of preoperative native femoral head size, age, gender, body mass index (BMI) and approach. Acetabular cup size relative to femoral head size was used as a surrogate for amount of bone resected. We compared the groups according to 2 measures describing acetabular cup diameter ( c) in relation to femoral head diameter ( f): (i) c-f, the difference between cup diameter and femoral head diameter and (ii) ( c-f)/ f, the same difference as a fraction of femoral head diameter. Results 57 matched pairs were included in each group. There were no significant differences between groups for demographic measures, femoral head diameter, or acetabular cup diameter (p>0.05). However, measures (i) and (ii) did differ significantly between the groups, with lower values in the RTHA group (p<0.02). Conclusions Using acetabular cup size relative to femoral head size as an approximate surrogate measure of acetabular bone resection may suggest greater preservation of bone stock using RTHA compared to CTHA. Further studies are needed to validate the relationship between acetabular cup size and bone loss in THA.

Comparision of Cup Anteversion and Tilt Effects on Dislocation Propensity for Small-Head-Size Total Hip Replacements

2000 ◽  
Author(s):  
Mark E. Nadzadi ◽  
Douglas R. Pedersen ◽  
John J. Callaghan ◽  
Thomas D. Brown
Keyword(s):  
Range Of Motion ◽  
Three Dimensional ◽  
Element Model ◽  
Head Size ◽  
Modular System ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Apparent Stiffness ◽  
Hip Replacements ◽  
Laboratory Examinations

Abstract While dislocation is a leading cause of total hip replacement failure, empirical observations far outnumber systematic laboratory examinations of this phenomenon. A previously validated three-dimensional, non-linear, contact finite element model was used to study how surgical placement affects dislocation propensity. The computational model employed a widely used 22mm modular system, and examined range of motion prior to impingement as well as peak moment developed to resist dislocation under a typical leg-crossing maneuver. Results were compared to a previous study of an otherwise similar 26mm modular head system, using the same formulation. Similar trends occurred. Increasing tilt and/or anteversion increased both the range of motion and the peak resisting moment, while apparent stiffness seemed to be unaffected. Further, impingement range of motion was independent of head size, but peak resisting moment was nearly 25% less for the 22mm head sizes.

scholarly journals Head-Neck Taper Corrosion in Hip Arthroplasty

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
S. Hussenbocus ◽  
D. Kosuge ◽  
L. B. Solomon ◽  
D. W. Howie ◽  
R. H. Oskouei
Keyword(s):  
Femoral Head ◽  
Hip Arthroplasty ◽  
Design Feature ◽  
Review Article ◽  
Femoral Head Size ◽  
Leg Length ◽  
Wear Properties ◽  
Femoral Stems ◽  
Head Neck ◽  
Neck Junction

Modularity at the head-neck junction of the femoral component in THA became popular as a design feature with advantages of decreasing implant inventory and allowing adjustment of leg length, offset, and soft tissue balancing through different head options. The introduction of a new modular interface to femoral stems that were previously monoblock, or nonmodular, comes with the potential for corrosion at the taper junction through mechanically assisted crevice corrosion. The incidence of revision hip arthroplasty is on the rise and along with improved wear properties of polyethylene and ceramic, use of larger femoral head sizes is becoming increasingly popular. Taper corrosion appears to be related to all of its geometric parameters, material combinations, and femoral head size. This review article discusses the pathogenesis, risk factors, clinical assessment, and management of taper corrosion at the head-neck junction.

scholarly journals The effects of venting and capsulotomy on traction force and hip distraction in hip arthroscopy

2020 ◽  
Author(s):  
Dillon C O’Neill ◽  
Matthew L Hadley ◽  
Temitope F Adeyemi ◽  
Stephen K Aoki ◽  
Travis G Maak
Keyword(s):  
Femoral Head ◽  
Hip Arthroscopy ◽  
Traction Force ◽  
Substantial Improvement ◽  
Head Size ◽  
Femoral Head Size ◽  
Post Intervention ◽  
Before And After ◽  
Hip Distraction

Abstract This study evaluated the effects of venting and capsulotomy on the ratio of normalized distraction distance to traction force, correlating this trend with patient demographic factors. A ratio was chosen to capture the total effect of each intervention on the hip joint. During primary hip arthroscopy, continuous traction force was recorded, and fluoroscopic images were acquired to measure joint distraction before and after the application of traction, venting and interportal capsulotomy. Distraction–traction force ratios were compared using a one-sided paired t-test. A linear regression model was used to determine the relationship between age, sex and body mass index and pre- and post-intervention distraction–traction force ratios. Seventy-two adult patients and 73 hips were included. There was an increase in hip distraction with a decrease in traction force post-venting and capsulotomy (both P’s &lt;0.001). Mean normalized distraction distance increased 1.5% of femoral head size after venting and an additional 2.2% of femoral head size after capsulotomy. Mean traction force decreased 2.2% (14.7 N) after venting and 2.3% (15.3 N) after capsulotomy. Female sex significantly correlated with larger differences in both pre- and post-venting capsulotomy ratios. Venting and capsulotomy both independently improve the ratio of normalized distraction distance to traction force when performed in vivo. However, the effect sizes of each intervention are small and of questionable clinical significance. Specifically, when adequate distraction for safe surgical hip access cannot be obtained despite application of significant traction force, venting and capsulotomy after the application of traction may not afford substantial improvement.

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