Career
Karppinen"s biggest successes were at the Nordic skiing World Championships where he earned 10 medals, including 5 golds (18 km: 1935, 4 x 10 km: 1934, 1935, 1938, 1939) and 5 silvers (18 km: 1939. 50 km: 1935, 1937, 1939. And 4 x 10 km: 1937).