Ferhat ÇAY ◽  
Burhan Hakan KANAT ◽  
Barış Çağlar KANAT ◽  
Mustafa GİRGİN ◽  
Ali AKSU ◽  
2010 ◽  
Vol 19 (01) ◽  
pp. 36-39 ◽  
P. Chládek ◽  
V. Havlas ◽  
T. Trc

SummaryThe treatment of femoral head necrosis of adults is still rather problematic. Conservative treatment has been reported relatively unsuccessful and surgical treatment does not show convincing results either. The most effective seems to be a surgical treatment in early stages of the disease, however, the diagnosis still remains relatively complicated. For the late stages (2B and above) the most effective treatment option is represented by core decompression and vascular grafting. However, drilling and plombage (especially when using press-fit technique) seems to be successful, although not excellent. The authors describe their own method of drilling and plombage of the necrotic zone of the femoral head in 41 patients with X-ray detected necrotic changes of the femoral head. The pain measured by VAS was seen to decrease after surgery in all patients significantly. The Jacobs score was also observed to have increased (from fair to good outcome). We have not observed any large femoral head collapse after surgery, moreover, in some cases an improvement of the round shape of the femoral head was seen. It is important to mention that in all cases femoral heads with existing necrotic changes (flattening or collapse) were treated. Although the clinical improvement after surgery was not significantly high, the method we describe is a safe and simple method of diminishing pain in attempt to prepare the femoral head for further treatment in a future, without significant restriction of the indication due to necrosis (osteochondroplasty, resurfacing, THR).

2020 ◽  
N Kolbe ◽  
B Zimmer ◽  
P Matheis ◽  
M Streit ◽  
T Gotterbarm ◽  

2020 ◽  
Vol 2020 (10) ◽  
pp. 4-11
Victor Tikhomirov ◽  
Aleksandr Gorlenko ◽  
Stanislav Volohov ◽  
Mikhail Izmerov

The work purpose is the investigation of magnetic field impact upon properties of friction steel surfaces at fit stripping with tightness through manifested effects and their wear visually observed. On the spots of a real contact the magnetic field increases active centers, their amount and saturation with the time of dislocation outlet, and has an influence upon tribo-mating. The external electro-magnetic field promotes the increase of the number of active centers at the expense of dislocations outlet on the contact surface, and the increase of a physical contact area results in friction tie strengthening and growth of a friction factor. By the example of friction pairs of a spentonly unit in the suspension of coach cars there is given a substantiation of actuality and possibility for the creation of technical devices with the controlled factor of friction and the stability of effects achieved is also confirmed experimentally. Investigation methods: the fulfillment of laboratory physical experiments on the laboratory plant developed and patented on bush-rod samples inserted with the fit and tightness. The results of investigations and novelty: the impact of the magnetic field upon the value of a stripping force of a press fit with the guaranteed tightness is defined. Conclusion: there is a possibility to control a friction factor through the magnetic field impact upon a friction contact.

2012 ◽  
Vol 11 (1) ◽  
pp. 26-34
Sophia N. Sangiorgio ◽  
Edward Ebramzadeh ◽  
Sean L. Borkowski ◽  
Daniel A. Oakes ◽  
Jeremy J. Reid ◽  

W Macdonald ◽  
L V Carlsson ◽  
G J Charnley ◽  
C M Jacobsson

2020 ◽  
Vol 61 (6) ◽  
pp. 177-187
Till Kämmerer ◽  
Tony Lesmeister ◽  
Victor Palarie ◽  
Eik Schiegnitz ◽  
Andrea Schröter ◽  

Introduction: We aimed to compare implant osseointegration with calcium phosphate (CaP) surfaces and rough subtractive-treated sandblasted/acid etched surfaces (SA) in an in vivo minipig mandible model. Materials and Methods: A total of 36 cylindrical press-fit implants with two different surfaces (CaP, n = 18; SA, n = 18) were inserted bilaterally into the mandible of 9 adult female minipigs. After 2, 4, and 8 weeks, we analyzed the cortical bone-to-implant contact (cBIC; %) and area coverage of bone-to-implant contact within representative bone chambers (aBIC; %). Results: After 2 weeks, CaP implants showed no significant increase in cBIC and aBIC compared to SA (cBIC: mean 38 ± 5 vs. 16 ± 11%; aBIC: mean 21 ± 1 vs. 6 ± 9%). Two CaP implants failed to achieve osseointegration. After 4 weeks, no statistical difference between CaP and SA was seen for cBIC (mean 54 ± 15 vs. 43 ± 16%) and aBIC (mean 43 ± 28 vs. 32 ± 6). However, we excluded two implants in each group due to failure of osseointegration. After 8 weeks, we observed no significant intergroup differences (cBIC: 18 ± 9 vs. 18 ± 20%; aBIC: 13 ± 8 vs. 16 ± 9%). Again, three CaP implants and two SA implants had to be excluded due to failure of osseointegration. Conclusion: Due to multiple implant losses, we cannot recommend the oral mandibular minipig in vivo model for future endosseous implant research. Considering the higher rate of osseointegration failure, CaP coatings may provide an alternative to common subtractive implant surface modifications in the early phase post-insertion.

2021 ◽  
Vol 1109 (1) ◽  
pp. 012027
J Gonzaga ◽  
A T Ubando ◽  
E Arriola ◽  
R L Moran ◽  
N R E Lim ◽  

2010 ◽  
Vol 113 (7) ◽  
pp. 532-539 ◽  
M. Jagodzinski ◽  
M. Ettinger ◽  
C. Haasper ◽  
S. Hankemeier ◽  
D. Breitmeier ◽  

Sign in / Sign up

Export Citation Format

Share Document