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Biomedical subjects

George Hanna

Publications and source records attributed to George Hanna.

4 recordsLinked to original sources
PubMed2006

Hip arthroscopy technique and indications.

The recent advances in hip arthroscopy have made it a useful minimally invasive approach to the diagnosis and treatment of intra-articular hip pathology. It offers the benefits of being an outpatient procedure with short rehabilitation and few reported complications and does not hinder opportunities for future surgical interventions. The lateral approach has been widely accepted, and technical details are discussed. Patients typically present with mechanical symptoms and persistent pain resistant to a reasonable trial of conservative treatment and are without significant joint space narrowing. Indications include debridement of labral lesions and loose bodies as well as treatment of impingement syndrome and avascular necrosis. Arthroscopy has also proven a useful tool in evaluation components in symptomatic patients after hip arthroplasty and in the treatment of native and replacement joint infections.

Arthroplasty, Replacement, Hip↗
PubMed2006

The use of proximal fixed modular stems in revision of total hip arthroplasty.

Proximally fixed femoral stems in revision of total hip arthroplasties (THAs) have had inconsistent results. Our aim was to determine the safety and efficacy of a new proximally fixed modular stem in THA revision. Fifty-three patients underwent THA revision with the Exactech AccuMatch M-Series (Gainesville, Fla) modular stem and were followed up prospectively for an average of 2.5 years with preoperative and postoperative Harris Hip Score and SF-12 scores. A small number of complications were reported. One stem was revised within 4 weeks due to subsidence. No later mechanical failure cases were reported. Postoperative Harris Hip Score and SF-12 improved significantly. The use of this modular stem system appears to be safe and efficacious regarding fixation and function in the short term.

Arthroplasty, Replacement, Hip↗
PubMed2006

Elasticity of the living abdominal wall in laparoscopic surgery.

Laparoscopic surgery requires inflation of the abdominal cavity and this offers a unique opportunity to measure the mechanical properties of the living abdominal wall. We used a motion analysis system to study the abdominal wall motion of 18 patients undergoing laparoscopic surgery, and found that the mean Young's modulus was 27.7+/-4.5 and 21.0+/-3.7 kPa for male and female, respectively. During inflation, the abdominal wall changed from a cylinder to a dome shape. The average expansion in the abdominal wall surface was 20%, and a working space of 1.27 x 10(-3)m(3) was created by expansion, reshaping of the abdominal wall and diaphragmatic movement. For the first time, the elasticity of human abdominal wall was obtained from the patients undergoing laparoscopic surgery, and a 3D simulation model of human abdominal wall has been developed to analyse the motion pattern in laparoscopic surgery. Based on this study, a mechanical abdominal wall lift and a surgical simulator for safe/ergonomic port placements are under development.

Abdominal Wall↗