[Significance of the glenoid labrum for stability of the glenohumeral joint. An experimental study]

Unfallchirurg. 1990 Jan;93(1):19-26.
[Article in German]


In human cadavers we were able to show that the glenohumeral joint is comparable to the model of a physical piston. The labrum glenoidale functions like a valve against atmospheric pressure. It is possible to characterize the behavior of intraarticular negative pressure by the equation (formula; see text). The calculations of the force F of atmospheric pressure tending to resist distraction of the joint surfaces leads to a 95% confidence interval from 6.9 to 22.9 kp. Under a general anesthetic, distraction of the healthy glenohumeral joint also produces negative intraarticular pressure in the area of the fossa glenoidalis in vivo. Joints with a labral tear (Bankart defect) and a chronic instability are not characterized by this phenomenon. A change in intraarticular pressure might stimulate intraarticular pressure receptors. This could be important in functioning as a neuromuscular protection reflex for the joint.

Publication types

  • English Abstract

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Biomechanical Phenomena
  • Chronic Disease
  • Humans
  • Hydrostatic Pressure
  • Middle Aged
  • Shoulder Dislocation / physiopathology*
  • Shoulder Joint / physiopathology*