The 2004 Annual Meeting (January 14-20, 2004) of OASYS_NEW

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The Darrach Procedure: Are Additional Stabilization Procedures Necessary

Schnall S and Bollinger M. Orthopedics, University of Southern California, 1510 San Pablo Ave, Suite 322, Los Angeles, CA, USA

Criticism of distal ulna resection (“Darrach Procedure”) because of reported post-operative instability of the distal ulna has led to a variety of different procedures and modifications from the originally described method for the purpose of enhancing stability of the distal ulna. We questioned the necessity of this. Thirty procedures in 29 patients  were performed (by one surgeon) without any supplemental stabilization procedures.  Pre-operative diagnoses: 18 rheumatoid disease, 11 post traumatic arthritis, 1 degenerative arthritis. Average follow-up was 38 months (6-79 months), 8 patients were lost to follow-up; and one deceased.  Twenty-one patients were available for follow-up. Seventeen patients were seen in final follow-up and 4 had telephone interviews.  For the patients seen: Visual analog pain scale (1 no pain -10 unbearable pain) and patient satisfaction 1(unsatisfied) – 4(very satisfied) were assessed. Clinical instability of the distal ulna, range of motion and grip strength were recorded in patients seen. Patient satisfaction averaged 3.9/4, no instability was noted, pain averaged 0.2/10, grip strength averaged 76% of the contralateral side ( 10/17 patients  whose pre-op grip averaged 55% of opposite, post-op averaged 92%). Pronation averaged 81 degrees (80° on uninvolved) Supination averaged 84°  ( 87° on uninvolved). Pronation ranged from 45-90 degrees while supination ranged from 55-90 degrees. The same patient had the 45° of pronation and 55° of supination and had had a concomitant elbow injury. We conclude that done as described with careful attention to the amount of distal ulna resected allows for excellent results from the “Darrach Procedure” without supplemental stabilization procedures.