Suriet 1: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012. AFP PHOTO / DAVID GANNON
Suriet 2: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 3: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 4: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 5: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 6: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 7: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 8: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 9: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 10: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 11: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 12: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 13: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 14: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 15: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 16: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 17: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 18: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 19: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 20: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 21: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 22: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 23: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 24: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 25: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 26: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 27: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 28: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 29: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 30: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 31: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 32: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 33: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 34: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 35: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 36: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 37: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 38: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 39: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 40: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 41: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 42: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 43: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 44: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 45: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 46: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 47: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 48: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.
Suriet 49: An operation replacinging an artificial knee is photographed at the Hygiea Clinic in Berlin's Schoeneberg district on July 11, 2012.