Biomedical subjects

G Chami

Publications and source records attributed to G Chami.

3 recordsLinked to original sources

PubMed2006

Impending fractures in giant cell tumours of the distal femur: incidence and outcome.

Giant cell tumours are rare bone tumours that are characteristically benign but locally aggressive, most frequently occurring in the distal femur with pathological fractures being common. This paper investigates relationships between tumour size and cortical breach on initial X-rays and subsequent treatment. The X-rays of 54 patients with distal femoral giant cell tumours were reviewed. The volumes of the tumour, distal femur and a ratio between the two parameters were estimated. The presence of a cortical breach, discrete fracture and Campanacci grade was recorded. X-rays revealed intact cortical rim in 20 patients (37%), cortical breach in 22 patients (41%) and discrete fracture in 12 patients (22%). There was a significant difference in the ratio of tumour volume to distal femoral volume between the discrete fracture group and the cortical breach group. No significant differences in rates of local recurrence were demonstrated. Extended curettage was effective for intact and cortical breach groups; however, patients in the fracture group often required radical treatment.

Adolescent↗

PubMed2006

Smart tool for force measurements during knee arthroscopy: in vivo human study.

This paper describes the magnitude and patterns of forces obtained by using a probe, equipped with a six-axis force torque sensor, in knee arthroscopy. The probe was used by orthopaedic surgeons and trainees, who performed 11 different tasks in 10 standard knee arthroscopies. The force magnitude and patterns generated are presented; which can support the development of virtual arthroscopy systems with realistic haptic feedback. The results were compared across both groups of surgeons. A difference in the force patterns generated by senior versus junior surgeons was noted which can aid in the development of an objective assessment system for arthroscopy skills. The results could potentially be useful to assess future performance in real arthroscopy.

Arthroscopy↗

PubMed2006

Factors affecting targeting using the computer assisted orthopaedic surgery system (CAOSS).

An advantage of CAOS over traditional surgery is improved precision of implant position and trajectories in 3D space. However, the implementation of these trajectories often adds an extra step to the operation that increases operative time and requires extra training. This paper reports a study of variation in time-to-task and learning curve in performing a standard task of targeting in 3D space using Hull's CAOSS. It shows that time-to-task can be reduced by replacing a 3D targeting task with multiple independent 2D targeting tasks whilst potentially reducing targeting error. Based on this better understanding of targeting a novel jig was developed for performing dynamic hip Screw (DHS) insertion using CAOSS that would provide improved targeting performance by the surgeon.

Hip↗