The special clinical aspect of Dupuytren's disease is characterized by thickening and contracture of the fibrous pretendinous bands on the palmar surface of the hand and fingers. There are also presented firm nodules and atrophic grooves or pits in the pits in the skin of the palm of the hand. We analyzed the frequency of location of the contracture of the fibrous pretendinous bands, on one consecutive series of 200 cases. Only 2.5% of the cases were female. The bilaterality of Dupuytren's disease was evident in 53% of the cases. 26.5% of single affected hands were right and 20.5% were left. A percent of 73.5% of cases showed only one fibrous pretendinous band; 26.5% of cases showed association of two or three fibrous pretendinous band. The whole study material revealed the location of the fibrous pretendinous band as follows: 0.5% thumb; 1% index finger;15% middle finger; 87% ring finger and 25.5% little finger. The most common combination of affected fingers are in: 16.5% ring finger and little finger; 75% middle finger and ring finger; 2.5% middle finger, ring finger and little finger; 0.5% thumb and index finger. These data are important for the hand surgery. (Supported by CNMP 62054/2008).

The main traumatic deformities of the extensor expansion (EE) are the boutonnière lesion (BL) and the mallet finger (MF). The classical BL is characterized by flexion deformity at the proximal interphalangeal joint, with hyperextension of the metacarpophalangeal and terminal interphalangeal joint, caused by the rupture or division of the central slip of the EE in a finger. The MF is defined as a deformity resulting from loss of EE continuity to the distal finger joint. We analyzed the frequency of location for the two hands and for fingers II–V, on 2 consecutive series of 100 cases each. We noticed a slight predominance in the right hand fingers for both types of lesions: 54% for BL, and 57% for MF. Location of BL was as follows: 8% index finger (II); 42% middle finger (III); 29% ring finger (IV) and 21% little finger (V). There was no multidigital involvement in cases of traumatic BL. Location of MF was as follows: 34% index finger (II); 23% middle finger (III); 17% ring finger (IV) and 26% little finger (V). In three clinical cases there were two fingers involved (fingers IV and V). Traumatic lesions of the EE are more frequent in the dominant hand. The BL involve most often the fingers II and III (index and middle fingers), and MF lesions are more often located in fingers III and IV (middle and ring fingers). (Supported by CNMP 62054/2008).