Interface Kinematics of Transhumeral Prosthetic Sockets Using XROMM

Inclusion Criteria: * Male and female transhumeral amputees, 18 years or older of any ethnicity, who are current prosthetic users. Exclusion Criteria: * Subjects with frozen shoulder of the residual side, and/or severely limited active range of motion of the shoulder joint of the residual limb * Inability to tolerate wearing of a prosthetic socket * Mental impairment that renders a subject unable to comply with the study * Skin conditions such as burns or poor skin coverage as well as those with severe contractures that prevent prior prosthetic wear * Any electrically controlled medical device including pacemaker, implanted defibrillator or drug pumps * Neuropathy, uncontrolled diabetes, receiving dialysis * Any other significant comorbidity which would interfere with the study * Severe circulatory problems including peripheral vascular disease and pitting edema will be excluded * Cognitive deficits or mental health problems that would limit ability to participate fully in the study protocol * Women who are pregnant or who plan to become pregnant in the near future