Joint and method for setting a starting position

A joint for an orthopedic device, comprising;

• a first joint part;
• a second joint part arranged on the first joint part such that one or more of first joint part or second joint part is swivellable a swivel axis;
• a hydraulic system comprising
• a first hydraulic chamber,
• a second hydraulic chamber connected to the first hydraulic chamber by at least one fluid connection, and
• at least one valve configured to open and close the at least one fluid connection,
• wherein the hydraulic system is arranged and configured such that hydraulic fluid flows from the first hydraulic chamber into the second hydraulic chamber or from the second hydraulic chamber into the first hydraulic chamber when the first joint part is swivelled relative to the second joint part,
• wherein the hydraulic system has at least one volume which comprises a first partial volume and a second partial volume,
• wherein the hydraulic system has at least one further fluid line which comprises a first partial line and a second partial line,
• wherein the first partial volume is connected to the first hydraulic chamber via the first partial line and the second partial volume is connected to the second hydraulic chamber via the second partial line, and
• wherein the first partial volume is separated from the second partial volume by a displaceable separating device.