The dorsal interosseous muscle (DIM) may be indicated in the coverage of small defects of the hand as a proximally or distally based muscle flap. The objective of his two-part study was to define the vascular supply of the interosseous muscles of the hand, and to identify the dominant arterial pedicle of each muscle for potential use of these muscles as muscle or musculocutaneous flaps. A radio-opaque injectate (lead oxide, gelatin and water mixture) was injected into the femoral artery of 10 fresh cadavers. The intrinsic muscles of the hand were meticulously dissected along with their vascular pedicles, removed and radiographed. The number, type, diameter of vascular pedicles of muscles and their distribution were analyzed. The area of the vascular territory supplied by each source vessel was calculated. Ten embalmed cadavers were injected with red latex into their axillary arteries and a similar dissection protocol was followed. Vascularisation of the interosseous muscles is by palmar metacarpal arteries of the deep palmar arterial arch and dorsal metacarpal arteries. In addition to these constant axial blood supplies, there are rich perimuscular plexus from adjacent nutrient arteries. The origins and insertions of the muscles are also supplied by very fine vessels from this plexus. The diameters of the dominant branches ranged from 0.6 to 1.4 mm (mean 1.0 mm). The vascular territories of the dorsal metacarpal and common palmar arteries extend along the medial and lateral parts of the dorsal interosseous muscles. The dorsal interosseous muscle or musculocutaneous flap are more useful than other intrinsic muscles of the hand because the DIM are easily accessible via the dorsal hand and can be split distally or proximally, and a split musculosseous flap based proximally or distally on the dorsal metacarpal artery can be performed. The functional defect in the donor site after an interosseous muscle flap transfer of the second and third interosseous space is tolerable. This anatomic study provides further information to help design various flaps from the hand for local transfer. The authors describe a thirty-two-year-old male patient in whom the third dorsal interosseous muscle was used as a distally based myocutaneous flap to reconstruct a defect in the hand.
Shoulder Arthroscopy techniques may pose surgical risk to vascular structures that may cause active bleeding during surgery. The vascularity of the subacromial structures showed constant patterns of distribution and specific sources of bleeding were analyzed. Knowledge of the vascular anatomy may decrease the bleeding during subacromial arthroscopy surgery. Shoulder Arthroscopy techniques may pose surgical risk to vascular structures that may cause active bleeding during surgery. A detailed anatomy map of frequent sources of bleeding is more than desired in order to properly identify these bleeding points, and avoid the unnecessary overuse of thermal tools and pressure pumps to control the hemorrhage. Our purpose is to study the vascular anatomy of the subacromial space, and to map the major sources of expected bleeding during subacromial arthroscopy surgery. Ten shoulders of five adult cadavers underwent whole body arterial perfusion with a mixture of lead oxide, gelatin and water. The shoulders were dissected, photographed, tissue specimens were radio graphed, scanned and analyzed with a digital software analyzer. Careful dissection of the different arteries of the subacromial bursa, and anatomic landmarks of the walls were documented. Correlations of bleeding areas during subacromial arthroscopic surgery and cadaver dissection were carried out. A vascular map of the bursa was created. The vascularity of the subacromial structures showed constant patterns of distribution and specific sources of bleeding were analyzed. We divided this space into walls with their major arteries as follows: Anterior wall: Acromial branch of the thoracoacromial artery. Posterior wall: Acromial branch of the suprascapular artery. Medial wall: Anterior and posterior Arteries of the AC joint. Lateral wall: No major arteries identified. Vascularity of the roof and floor is also described. The subacromial space is highly vascular. Knowledge of the vascular anatomy may decrease the bleeding during subacromial arthroscopy surgery.
