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During 1982, 118 patients with clavicular fracture were treated in the Department of Orthopaedics and Traumatology, Helsinki University Central Hospital. Eighty-nine patients appeared for the follow-up examination in 1984. Eighty-three fractures were treated with immobilization in a sling. Four fractures were treated with plate fixation primarily and two patients were operated on for delayed union. The immobilization averaged 21 days, range 10-42 days. The follow-up was 2 years in all cases. The result was good in 65 cases, satisfactory in 20, and poor in 4 cases. Patients with primary dislocation of more than 15 mm or with shortening observed at the follow-up examination had statistically significantly more pain than patients without these findings.

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Forty-four rabbits were operated on when five weeks old; in one group a 2 mm drill-hole was made in the intercondylar portion of the right femur across the central portion of the growth plate up to the diaphysis, while in the other group a similar drill-hole of 3.2 mm was made. At 3, 6, 12 and 24 weeks after operation, specimens from the growth plates of both femora were analysed using radiographic, microradiographic, histological and histomorphometric techniques. It was found that destruction of 7% of the cross-sectional area of the growth plate caused permanent growth disturbance and shortening of the femur.