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Figure 3. Cross sections through distal end of conventional transhumeral socket showing why cylindrical socket loses motion. (a) Socket wall and humerus before application of force. Dashed line represents line of maximum compression. (b) Upward force has been applied to humerus causing it to move upward with respect to wall until tissue is compressed. Most of lost motion occurs before arm can cause socket to function usefully. Alley RD, Williams TW III, Albuquerque MJ, Altobelli DE. Prosthetic sockets stabilized by alternating areas of tissue compression and release. J Rehabil Res Dev. 2011; 48(6):679-96.DOI:10.1682/JRRD.2009.12.0197