Evaluation of a New Power-Operated PMMA Vacuum Mixing and Delivery System for Cemented Femoral Stem Insertion

Lahav, Amit; DiMaio, Frank R

doi:10.3928/0147-7447-20040101-19

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…For A-mode ultrasound-based intra-femoral bone cement detection a rotating scanning device is required. Whereas commercial endoscopic ultrasound (EUS) devices for gastrointestinal tract, oesophagus or intravascular investigation are mainly constrained to soft tissue investigation [27,30], the requirements for intra-femoral bone cement detection are different. As part of this study, we have investigated parameters such as the anticipated workspace and cement thickness, ultrasound-specific material properties of bone cement, and reflection coefficients of the cement-bone interface.…”

Section: Methodsmentioning

confidence: 99%

“…While use of a vacuum system is recommended for intraoperative bone cement mixing, older prostheses (>10 years old) were usually implanted without using such a system. The result is an increased porosity of the cement, in which the size and shape of the pores can vary considerably [28][29][30]. The effects of pores on ultrasound propagation inside PMMA can be manifold and must be taken into account.…”

Section: Ultrasound-specific Properties Of Bone Cementmentioning

confidence: 99%

“…The ultrasound probe is often coupled to an endoscopic device which offers (color-coded Doppler-based) microcamera inspection and additional surgical instrumentation. The instrumentation of the probes also enables the precise guidance of needles through the gut wall into the surrounding structures [30]. The depth of penetration of ultrasound systems depends on the center frequency of the probes and the acoustic properties of the medium.…”

Section: Measurement Setupmentioning

confidence: 99%

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A-mode ultrasound-based intra-femoral bone cement detection and 3D reconstruction in RTHR

Heger

Mumme

Sellei

et al. 2007

Computer Aided Surgery

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Due to the difficulty of determining the 3D boundary of the cement-bone interface in Revision Total Hip Replacement (RTHR), the removal of the distal intra-femoral bone cement can be a time-consuming and risky operation. Within the framework of computer- and robot-assisted cement removal, the principles and first results of an automatic detection and 3D surface reconstruction of the cement-bone boundary using A-mode ultrasound are described. Sound propagation time and attenuation of cement were determined considering different techniques for the preparation of bone cement, such as the use of a vacuum system (Optivac, Biomet). A laboratory setup using a rotating, standard 5-MHz transducer was developed. The prototype enables scanning of bisected cement-prepared femur samples in a 90 degrees rotation range along their rotation axis. For system evaluation ex vivo, the distal femur of a human cadaver was prepared with bone cement and drilled (Ø 10 mm) to simulate the prosthesis cavity in a first approximation. The sample was cut in half and CT scanned (0.24 mm resolution; 0.5 mm distance; 0.5 mm thickness), and 3D voxel models of the manually segmented bone cement were reconstructed, providing the ground truth. Afterwards, 90 degrees segments of each ex-vivo sample were scanned by the A-mode ultrasound system. To obtain better ultrasound penetration, we used coded signal excitation and pulse compression filtering. A-mode ultrasound signal detection, filtering and segmentation were accomplished fully automatically. Subsequently, 3D voxel models of each sample were calculated. Accuracy evaluation of the measured ultrasound data was performed by ICP matching of each ultrasound dataset ( approximately 8000 points) to the corresponding CT dataset and calculation of the residual median distance error between the corresponding datasets. Prior to each ICP matching, an initial pre-registration was calculated using prominent landmarks in the corresponding datasets. This method yielded a median distance error in the region of 0.25 mm for the cement-bone interface in both femur halves.

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Section: Methodsmentioning

confidence: 99%

Section: Ultrasound-specific Properties Of Bone Cementmentioning

confidence: 99%

Section: Measurement Setupmentioning

confidence: 99%

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