Force distribution across wrist joint: Application of pressure-sensitive conductive rubber

Toshiaki Hara, Emiko Horii, Kai Nan An, William P. Cooney, Ronald L. Linscheid, Edmund Y.S. Chao

Research output: Contribution to journalArticlepeer-review

108 Scopus citations


A new pressure-sensitive conductive rubber sensor was used for investigation of the pressure distribution through the radio-ulno-carpal joint. Twelve of these transducers were placed in the radio-ulno-carpal joint. Pressure was measured in seven different wrist positions under loads incrementally increasing from 0 to 12 kg. Half of the sensors showed less than 0.5 MPa, even at maximum load, while a high-pressure area was located palmarly in each fossa. The peak pressure measured in the wrist neutral position was 2.4 MPa on the scaphoid fossa, 1.5 MPa on the lunate fossa, and 1.1 MPa on the triangular fibrocartilage with a 10 kg load. The peak pressure ratio between the scaphoid and the lunate was 1.7 in the neutral wrist position. This increased in radial deviation to 2.9 and decreased in ulnar deviation to 0.8. The force-transmission ratio was 50% through the scaphoid fossa, 35% through the lunate fossa, and 15% through the triangular fibrocartilage in the neutral position. The advantage of this sensor is that it is thin and flexible and provides reliable reproducible quasi-instantaneous measurements.

Original languageEnglish (US)
Pages (from-to)339-347
Number of pages9
JournalJournal of Hand Surgery
Issue number2
StatePublished - Mar 1992

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine


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