Biomedical subjects

P H Watters

Publications and source records attributed to P H Watters.

2 recordsLinked to original sources

PubMed1984

Failure of the femoral component in the Howse total hip arthroplasty.

Fatigue failure of the femoral stem is reported in ten cases of the Howse modification of the Charnley total hip arthroplasty. The overall incidence is comparable to the Charnley original design. Torsional forces are important in the mechanism of failure. Medical cracking (not previously described) was discovered leading to stepped fracture surfaces. Multiple medial cracking has long-term implications for the Howse design. Torsional forces result in oblique fracture lines that are not always visible before surgery. Weight-bearing roentgenograms are advised prior to revision surgery.

Adult↗

PubMed1983

Artefact encountered by the vibration detection system.

The use of piezo-electric accelerometers to detect sounds and vibrations emitted from joints and tissues is a significant advance on acoustic detection systems. All possible sources of artefact signal encountered by the vibration emission technique were investigated. A number of errors could be avoided by good technique. All artefact signals were easily distinguished from true vibration emission. As the accelerometer cables were part of the capacitance system it was concluded that other types of accelerometer should be investigated to reduce cable noise.

Biomechanical Phenomena↗