The hydroxyapatite-ABG hip system

Tonino, A.J.; Rahmy, Ali

doi:10.1016/s0883-5403(00)90486-8

Cited by 97 publications

(11 citation statements)

References 25 publications

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“…The pattern of remodelling produced by this anatomic cementless stem was similar to those shown by other second-generation cemented stems, with a decrease of bone mass ranged between 20% and 25% in proximal areas, 5% and 15% in intermediate areas and with no significant loss in distal areas (Tonino et al, 2000;Gibbons et al, 2001;Ka¨rrholm et al, 2002). It was also shown in these studies that the changes remained stable after the first or second year of the operation.…”

Section: Discussionsupporting

confidence: 82%

Long-term study of bone remodelling after femoral stem: A comparison between dexa and finite element simulation

Herrera

Panisello

Ibarz

et al. 2007

Journal of Biomechanics

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Section: Discussionsupporting

confidence: 82%

Long-term study of bone remodelling after femoral stem: A comparison between dexa and finite element simulation

Herrera

Panisello

Ibarz

et al. 2007

Journal of Biomechanics

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“…This was seen in 97.3% of the patients after 5 years, while only 1.4% of the patients had moderate lateral thigh pain. Although this result is only slightly better than other contemporary implants based on the same philosophy [8, 26, 27, 33–35], it is clearly superior to older designs that follow different philosophies [36, 37]. This may be related to the distal geometry with posterior chamfer to prevent stem tip impingement.…”

Section: Discussionmentioning

confidence: 81%

5-year clinical and radiographic follow-up of the uncemented Symax hip stem in an international study

et al. 2018

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BackgroundThe uncemented Symax hip stem is developed through optimization of the uncemented Omnifit hip stem. The Symax stem design combines an anatomical anteverted proximal geometry with a straight distal section. The proximal part is coated with a biomimetic hydroxyapatite (HA) coating for improved osseointegration to enhance load transfer and to minimize proximal bone loss. The distal part is treated with an anodization surface treatment in order to prevent distal bone apposition, which is expected to prevent distal loading and reduce proximal stress shielding. Aim of this study is to report mid-term clinical performance and evaluate whether the radiographic features are in line with the design principles of the Symax hip.MethodsThe biomimetic hydroxyapatite-coated uncemented Symax hip stem was evaluated in 80 patients during a 5-year prospective clinical international study. Harris Hip Score (HHS), Oxford Hip Score (OHS), and Western Ontario and McMaster Universities Arthritis Index (WOMAC) were performed preoperatively and postoperatively at 6 months and 1, 2, 3 and 5 years. Anteroposterior radiographs of the pelvis and axial radiographs of the operated hips were evaluated immediately postoperative and at follow-up 6 months and 1, 2, 3, and 5 years. Wilcoxon signed-rank test was used to analyse whether clinical outcome scores changed statistically significant over time. The overall percentage of agreement between two radiology assessment teams was used to evaluate observer agreement of radiology results. The Cohen’s Kappa was evaluated as a measure of reliability to quantify the agreement between raters, corrected for chance agreement.ResultsClinical outcome scores were excellent at 5 years with mean HHS of 98.1, mean OHS of 16.2 and mean WOMAC of 6.9. Only 2.7% of the patients had pain at rest or on weight-bearing, and mid-thigh pain was reported by 1.4% of the patients after 5 years. The percentage of agreement between radiology assessment teams was 94 to 100%, except for distal line formation (48%). Radiographic evaluation showed stable stems and signs of excellent progressive proximal fixation and favourable bone remodeling.ConclusionsThe excellent mid-term clinical and radiographic performances are in line with the design principles and coating properties of this new implant and earlier published results.Trial registrationhttp://ClinicalTrials.gov, NCT03469687. Registered 19 March 2018 – Retrospectively registered.

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“…In this case, the retrieved HA‐coated implants revealed a bone contact ratio of 87.5% (corresponding tooth 36) and 97.4% (corresponding tooth 37), respectively. Favorable long‐term clinical results obtained with HA‐coated implants could also be demonstrated in orthopedic studies (Tonino & Rahmy 2000; Geesink 2002) and in studies using HA as an onlay bone graft material in the mandible and maxilla (Hjorting‐Hansen et al 1990; Nunes et al 1997; Proussaefs et al 2002). Therefore, when comparing the results of HA‐coated implants with those of titanium implants, it may be worth specifying the surface type of titanium implants.…”

Section: Discussionmentioning

confidence: 95%

Histological evidence of osseointegration in human retrieved fractured hydroxyapatite‐coated screw‐type implants: a case report

Uehara¹,

Takaoka²,

Ito³

2004

Clinical Oral Implants Res

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Histological evidence of clinically successful dental implants is very rare. This case report presents histological evidence of osseointegration in human implants retrieved because of fractures at the connected portion between the abutments and fixtures due to a car accident. The duration of functional loading of the implants was 18 months. Two hydroxyapatite (HA)-coated screw-type implants were removed with part of the healthy bone from the mandibular left molar region. A block was prepared using cutting and grinding equipment to obtain a central section approximately 50 microm thick, which was stained with basic fuchsin and methylene blue. Histological examination revealed that the bone was dense and in close relation with the HA coating of the implants. The interspaces of each thread of the implant were filled with mineralized bone. Peri-implant soft tissue was not observed in the section. A high degree of osseointegration was noted, with a bone-to-implant contact of 87.5% (implant corresponding to tooth 36) and 97.4% (implant corresponding to tooth 37). The connection between the 30 and 50 microm HA coating and the metal was uniformly tight and constant. In conclusion, the histological evidence showed a high degree of osseointegration in two HA-coated screw-type dental implants retrieved after functional loading for 18 months.

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The hydroxyapatite-ABG hip system

Cited by 97 publications

References 25 publications

Long-term study of bone remodelling after femoral stem: A comparison between dexa and finite element simulation

Long-term study of bone remodelling after femoral stem: A comparison between dexa and finite element simulation

5-year clinical and radiographic follow-up of the uncemented Symax hip stem in an international study

Histological evidence of osseointegration in human retrieved fractured hydroxyapatite‐coated screw‐type implants: a case report

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