Scapulothoracic dissociation is a high-energy injury resulting from massive traction injury to the shoulder girdle with disruption of the scapulothoracic articulation. The most common long term result from this injury is complete loss of motor and sensory function of the extremity (flail limb), with death in the acute or semi-acute period also common.
The referenced study by Althausen et al found that outcomes from this injury were: a flail extremity in 52%, early amputation in 21%, and death in 10%.
The other referenced study by Ebraheim et al found that 12/15 patients had a complete brachial plexus injury and that none recovered any function (the other 3 patients died in the acute period).
Althausen PL, Lee MA, Finkemeier CG. Scapulothoracic dissociation: diagnosis and treatment. Clin Orthop Relat Res. 2003 Nov;(416):237-44.
PMID:14646766 (Link to Abstract)
Ebraheim NA, An HS, Jackson WT, Pearlstein SR, Burgess A, Tscherne H, Hass N, Kellam J, Wipperman BU. Scapulothoracic dissociation. J Bone Joint Surg Am.
PMID:3346268 (Link to Abstract)