Osteogenic Phenomena Across Endosteal Bone-Implant Spaces with Porous Surfaced Intramedullary Implants

Bobyn, J. D.; Pilliar, Robert M.; Cameron, Hugh U.; Weatherly, G. C.

doi:10.3109/17453678108991775

Cited by 98 publications

(33 citation statements)

References 13 publications

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“…20 Our design features both elements: the multiple-point contact in both planes results in an immediate 'macrolock' and fibre metal pads give osseous integration with rigid fixation. 8,21 The value of a tapered device in optimising bone remodelling in the lateral plane has recently been demonstrated by Kuiper and Huiskes.…”

Section: Discussionmentioning

confidence: 99%

A conservative femoral replacement for total hip arthroplasty

Morrey

Adams

Keßler

2000

The Journal of Bone and Joint Surgery. British volume

109

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Between 1985 and 1993, 146 patients (162 hips) had total hip replacement (THR) using a conservative uncemented femoral component. The mean age of the patients was 50.8 years and the mean follow-up was 6.2 years (2 to 13). One patient was lost to follow-up, one died within two years of surgery and one had a revision procedure after a fracture sustained in a road-traffic accident.For the remaining 159, Kaplan-Meier survival analysis was calculated for the incidence of revision because of mechanical loosening or osteolysis. Survival without mechanical loosening at both five and ten years was 98.2%. Survival without osteolysis was 99% at five and 91% at ten years. The Harris hip score improved from a mean of 66.3 before to 90.4 at follow-up. Of particular note is the lack of thigh pain in this group. Radiological analysis showed that 139 stems (88%) had no measurable subsidence, 8 (5%) had less than 2 mm and 12 (7%) had more than 2 mm. Two of the eight and one of the 12 were revised for mechanical loosening. Nine hips were revised for late loosening associated with osteolysis. No reaming of the femoral canal was associated with statistically significant less blood loss compared with a comparable control group of uncemented implants (p < 0.0001).Our study suggests that using a conservative femoral implant does not protect against wear debris but the reliable mechanical stability (98.2%) makes this an attractive design of implant particularly for young patients.

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Section: Discussionmentioning

confidence: 99%

A conservative femoral replacement for total hip arthroplasty

Morrey

Adams

Keßler

2000

The Journal of Bone and Joint Surgery. British volume

109

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“…Bone ingrowth into cementless prosthetic components is difficult because of the gap between the prosthesis and the surrounding bone. Examination of the histological sections and corresponding microradiographs clearly demonstrated that direct contact between bone and prosthesis increased the osseous response to the implants (Bobyn et al, 1981;Cook et al, 1988;Dalton et al, 1995;Lind et al, 1996;Sandborn et al, 1988). Dalton et al(1995) evaluated the mechanical and histological response to femoral intramedullary implants with different gaps in dogs.…”

Section: Discussionmentioning

confidence: 99%

The dimensional accuracy of preparation of femoral cavity in cementless total hip arthroplasty

Hahne

Hassenpflug

2004

J. Zheijang Univ.-Sci.

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Abstract:Objective: To observe the accuracy of femoral preparation and the position of the cementless prosthesis in femoral cavity, and to compare the results between the computer-assisted surgical group (CASPAR) and the conventional group. Methods: Ten femoral components were implanted either manually or by CASPAR in cadaver femurs. The specimens were cut to 3 mm thick slices. Microradiograms of every slice were sent to a computer for analysis with special software (IDL). The gaps and the medullary cavities between component and bone, the direct bone contact area of the implant surface, the gap width and the percentage of gap and bone contact area were measured in every slice. Results: In the proximal implant coated with HA of the CASPAR group, the average percentage of bone contact reached 93.2% (ranging from 87.6% to 99.7%); the average gap percentage was 2.9% (ranging from 0.3% to 7.8%); the maximum gap width was 0.81 mm and the average gap width was only 0.20 mm. While in the conventional group, the average percentage of bone contact reached 60.1% (ranging from 49.2% to 70.4%); the average gap percentage was 32.8% (ranging from 25.1% to 39.9%); the maximum gap width was 2.97 mm and the average gap width was 0.77 mm. The average gap around the implant in the CASPAR group was only 9% of that in the manual group; the maximum and average gap widths were only about 26% of those in the manual group. On the other hand, the CASPAR group showed 33% higher bone contact than the manual group. Conclusion: With the use of robotics-assisted system, significant progress can be achieved for femoral preparation in total hip arthroplasty.

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“…Bone has been shown to grow into a variety of porous materials such as bone cement (Ypma 1981, DeVijn 1982, polyethylene (Spector et al 1975, Klawittel et al 1976, titanium fibre mesh (Galante et al 1971), stainless steel (Nilles et al 1973, Ducheyne et al 1977) and cobalt-chrome alloys (Cameron et al 1972, Bobyn et al 1980, Hedley et al 1982. The PCA prosthesis in this study represents the first commercially available knee prosthesis with porous coating (Hungerford et al 1982) and preliminary clinical results have been excellent (Hungerford & Kenna 1983).…”

Section: Biological Ingrowthmentioning

confidence: 99%

“…The PCA knee was the first commercially available prosthesis provided with a porous surface. These pores have a mean diameter of 425 pm which is close to the optimal size for bony ingrowth (Bobyn et al 1980). After meticulous preparation of the bone immediate fixation is achieved by press-fit, together with a bone screw and molly bolt.…”

Section: Biological Ingrowth Seriesmentioning

confidence: 99%

Micromotion in knee arthroplasty

Ryd

1986

Acta Orthopaedica Scandinavica

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1.The coordinate system for unicompartmental and total prostheses. 2. The Venn diagram used in the Lund assessment system. 3. Total Condylar knee prosthesis. 17 4. Modular (Marmor) knee prosthesis. 5. Kinematic Migration:original position to a new resting position. Inducible displacement:the prosthesis is detachable from its resting position. Rigid body:Rigid-body model (RBM): A configuration of three or more non-collinear markers representing the bodies of interest (prostheses or bone segments), and used for calculation of movements.

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Osteogenic Phenomena Across Endosteal Bone-Implant Spaces with Porous Surfaced Intramedullary Implants

Cited by 98 publications

References 13 publications

A conservative femoral replacement for total hip arthroplasty

A conservative femoral replacement for total hip arthroplasty

The dimensional accuracy of preparation of femoral cavity in cementless total hip arthroplasty

Micromotion in knee arthroplasty

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