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Biomedical subjects

S T Woolson

Publications and source records attributed to S T Woolson.

45 records · Page 3Linked to original sources
PubMed1985

Three-dimensional imaging of the ankle joint from computerized tomography.

A computer system was developed to rapidly reconstruct three-dimensional (3D) images of bone from computerized tomography scans of the ankle joint. Solid models of the bones were produced from the 3D image data through the use of a computer numerically controlled milling machine. A cadaver ankle joint was scanned, and models of the distal tibia and fibula and dome of the talus were made and compared to the actual bone specimens. The measurements of the models were within 3 mm or less of the bones in all three planes (average, 1.2 mm or 5.5%). These 3D images and models of bone should allow better visualization of joint pathology and a system for preoperative planning on exact bone models to optimize the results of surgery.

Ankle Joint↗
PubMed1985

Three dimensional imaging of bone from analysis of computed tomography data.

A computer system was developed to reconstruct three dimensional images of bone from analysis of computed tomography data. Images of bone can be made within minutes and rotated for viewing from any direction. An editing process allows visualization of the articular surfaces of any joint. Solid models of the bone images can be produced with an accuracy of 1 mm to 3 mm by interfacing the image data with a computer numerically controlled milling machine. This technology will provide better information to the surgeon for preoperative diagnosis and planning and for the design of customized implants.

Adult↗
PubMed1985

A method of intraoperative limb length measurement in total hip arthroplasty.

Equalization of leg-length discrepancy during total hip arthroplasty is a major concern to both the patient and surgeon. A stable pelvic reference point must be established during surgery to determine leg-length changes. An accurate method of intraoperative leg-length measurement is presented to improve the surgeon's ability to determine the exact amount of limb lengthening or shortening occurring during total hip arthroplasty.

Anthropometry↗
PubMed1985

Time-related improvement in the range of motion of the hip after total replacement.

We studied the progression of improvement in the range of motion of the hip after total hip replacement as it was related to time postoperatively. One hundred and eight hip replacements performed by members of the Stanford University Division of Orthopaedic Surgery in ninety-two patients were included in the analysis. The hips had no major postoperative complications, and the range of motion was examined preoperatively; at six months, one year, and two years, postoperatively; and at a last follow-up examination at a minimum of 4.5 years. There was no statistically significant improvement in the flexion and abduction of the hip after the one-year follow-up visit, but adduction and internal and external rotation were improved significantly at the last follow-up (average, 7.5 years). Of multiple variables that were studied, including those related to the patient, to the size and design of the prosthesis, and to the orientation of the total hip components, only the preoperative range of motion of the hip and a history of previous surgical treatment were major determining factors in the postoperative improvement of the range of motion.

Adult↗
PubMed1984

Acetabular component migration following traumatic total hip dislocation. A case report.

A 40-year-old man with a total hip arthroplasty was injured in an auto accident. The injury was a posterior fracture-dislocation of the total hip and produced migration of a dislocated acetabular prosthesis. A large hematoma extended from the hip to the medial aspect of the thigh. This unusual case illustrates the importance of obtaining serial roentgenograms for hip arthroplasties and for injuries of the hip joint.

Acetabulum↗
PubMed1983

Complex total hip replacement for dysplastic or hypoplastic hips using miniature or microminiature components.

We analyzed the preoperative and perioperative data on sixty-nine consecutive complex total hip replacements performed in fifty-seven patients using miniature or microminiature custom-made femoral components. The patients' average age was 45.7 years. The preoperative diagnosis was congenital dysplasia or dislocation of the hip in 72 per cent of the hips. Acetabular bone grafts were required in thirty-seven of the sixty-nine hips. Operative complications occurred in thirteen (19 per cent) and postoperative dislocation occurred in eleven (16 per cent) of the sixty-nine hips. Fifty-five hips in forty-seven patients were followed for a minimum of two years, the average follow-up being 4.8 years and the longest, 9.8 years. All acetabular grafts united. Loosening of one or both prosthetic components occurred in ten (18 per cent) of the fifty-five hips (twelve of the 110 components became loose). There were no instances of a stem bending or fracturing, despite the small size of the femoral components. Eight hips (14.5 per cent) had undergone revision, six for painful loose components and two for recurrent dislocation. For the forty-seven hips that were not revised, the average Harris hip score rose from 43 points preoperatively to 80 points postoperatively.

Adolescent↗