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Orthopaedic Proceedings
Vol. 86-B, Issue SUPP_I | Pages 82 - 83
1 Jan 2004
Shah NH Mohsen AMMA Sherman KP Phillips R Viant WJ
Full Access

Hull Medical Engineering (HULMEC) group was established in 1992 as a collaboration of orthopaedic surgeons and various research groups from the University of Hull to promote multidisciplinary research especially the application of computers to aid in surgery. With the joint effort of researchers and surgeons CAOSS was developed.

The key aim of the CAOSS has been to use intra-operative surgical planning using fluoroscopic based images, hence this system aids in performing those procedure which requires fluoroscopy namely dynamic hip screw guide wire insertion, distal locking of the screw and placement of cannulated hip screw. The major steps of CAOSS are the precision calibration of the fluoroscopic images, use of these images for accurate intra operative surgical planning, innovative planning algorithms, and a safe, rapid and accurate approach to trajectory execution. CAOSS has been used on the plastic bones in the laboratory setting and was found to be accurate. Presently CAOSS has been used in an ethically approved clinical trial for guide wire insertion for the DHS placement.

Perceived Advantages of CAOSS

Safe

Passive system

Non-invasive

Surgeon maintains decision making

Decreasing radiation exposure

Reducing complexity of the procedure

Reducing technical failures

Reducing operating time

Improving accuracy of implant placement

Reducing bone damage (by reducing repeated guide wire insertion)

Improving Patient outcome

Cost Effective

Easy to use


Orthopaedic Proceedings
Vol. 85-B, Issue SUPP_II | Pages 124 - 124
1 Feb 2003
Mohsen AMMA Gillespie PC
Full Access

Healthcare organisations are accountable for improving the quality of their services, safeguarding high standards of care and meeting shorter waiting time targets. This presents a challenge of how to achieve such targets with limited resources. This paper looks at the hypothesis that adequate and appropriate clinical governance can be undertaken while increasing orthopaedic spinal clinic throughput in order to decrease outpatient waiting times.

A spinal outpatient clinic was used as the test bed for the hypothesis of the project. The theoretical number of patients an individual consultant can see per session was calculated from recommended British Orthopaedic Association consultation times for new and follow-up cases. Patients were asked to complete the MODEMS (Musculoskeletal Outcomes Data Evaluation and Management System) questionnaire. A prospective randomised trial utilising a touch-screen computerised version of the questionnaire was also used. Time taken for outcome data management is included in the analysis. The time taken to see new and follow up patients was 31–42 and 24–35 minutes respectively. These times have implications in terms of waiting times and Director of Performance Management targets. The shortfall is calculated in terms of additional support necessary to reach these targets. Salary costs and infrastructural support costs are projected. The figure is likely to represent that required by any specialist clinic to realise the ideals of clinical governance and conservatively estimated to be £35, 000 per year.

Total clinical governance and patient outcomes are inextricably linked. This is true of orthopaedic spinal surgery in that important information about clinical practice can be obtained. The organizational infrastructure and methods to implement data collection is technically feasible however is not without cost. In terms of economic evaluation the correct price for a resource is its opportunity cost. ‘Don’t just buy more healthcare, invent new healthcare’ is as incongruous as total clinical governance and increased capacity without support.


Orthopaedic Proceedings
Vol. 84-B, Issue SUPP_III | Pages 325 - 325
1 Nov 2002
Siddall D Mohsen AMMA Gillespie P Fagan. MJ
Full Access

Objective: A patient-specific finite element model of the spine is being developed to aid the surgeon in the diagnosis and clinical management of spinal conditions1. To validate the application of the computer model, a laboratory validation spine is being developed. This study is concerned with the development and basic characteristics of the intervertebral disc component of the laboratory spine.

Method: The external profile of the laboratory disc was determined from CT images of a cadaveric spine. A two-part silicon rubber was used to form the annulus part of the disc. Prior to sealing it was possible to fill the cavity with an appropriate medium (such as grease or oil) to represent the nucleus pulposus with the further option of applying external pressurisation through a small pressure inlet in the wall of the disc. The laboratory disc was then tested in denucleated form, and grease-filled with initial intradiscal pressures of 0, 0.1, 0.2 and 0.3 MPa. A finite element model of the disc was also developed and used to investigate the characteristics of the laboratory disc.

Results: The agreement between the finite element results and experimental test results was excellent and the compressive and flexural load-deflection characteristics of both intact and denucleated laboratory discs were found to lie within the range of values reported in the literature for cadaveric discs. Disc bulge characteristics of the intact and denucleated silicon discs were also similar to that observed with natural discs in vitro.

Conclusions: An artificial disc for a laboratory validation spine has been developed and shown to have representative characteristic properties in compression loading. The disc is now being modelled and tested in torsion.