[Long-term results of surgical treatment of scaphoid non union: influence of the correction of dorsal intercalated segment instability].

OBJECTIVES

The publications dealing with scaphoid non-union emphasize importance of correction of the Dorsal Intercalated Segment Instability (DISI) to achieve good functional results and to prevent osteoarthritis. The purpose of this study was to assess, over 10 years follow-up, the functional outcomes of 25 patients with scaphoid non-union surgery. X-ray and DISI deformity were assessed.

METHODS

Between 1994 and 1998, 53 patients underwent surgery for scaphoid non-union. Over 10 years follow-up, functional evaluation based on pain, QuickDASH and Mayo Wrist Score was performed, and a physical examination including mobility, strength and pain on the region of the scaphoid. Outcomes on X-rays were assessed by searching osteoarthritis damages and by measuring carpal height index and intracarpal angles.

RESULTS

Eight patients had pain on the scaphotrapeziotrapezoidal joint without degenerative lesions on radiography. Compared to other patients, they had worse functional results, decrease of scapholunate angle, decrease of the DISI and increase of carpal height.

CONCLUSIONS

The correction of the DISI is not always associated with good functional results. Although there were no osteoarthritic changes on the radiography, residual pain may be related to affection of the scapho-trapezo-trapezoidal joint. Surgical treatment with osteotomy of the scaphoid seems to be dangerous because of the moderate impact on function for these patients.