The treatment of 16 intraarticular fractures at the base of the fifth metacarpal was studied.
Intraarticular fractures at the base of the fifth metacarpal resembled Bennetts and Rolandos fractures in their pattern and in their tendency to instability. The problem was usually not the reduction, but rather maintaining the reduction. A force hitting the head of the fifth metacarpal along the longitudinal axis of the metacarpal was the most common cause of injury, Five fractures were immobilized in a plaster cast after closed reduction. Six fractures were treated by closed reduction and percutaneous pinning, 4 by open reduction and pinning. 1 by open reduction and plating. At follow up after median 14.8 months, the result of 11 cases was satisfactory. Two cases nonoperated showed decreased grip power, limited motion, radiographical signs of osteoarthritis, and pain. Three cases operated showed decreased grip power.
We concluded that restoration of articular surface and internal fixation againt the muscular pull was mandatory for a satisfactory outcome.
The fifth metacarpal neck fractures are unstable and often heals with angulation and deformity. So, after closed reduction and immobilization with splint or cast, they have often been lost reduction and healed with posterior angulation and cosmetic deformity. We conducted a prospective study of 11 patients who underwent percutaneous retrograde intramedullay K-wire fixation for a fracture of the neck of the fifth metacarpal during four years period.
We used a closed reduction technique derived from Jahss maneuver or three point fixation maneuver. And, the fracture was maintained with two cross or parallel smooth intramedullary K-wire. The proximal side of K-wire was placed back wound side near the wrist joint. The last follow up (postoperative 14±2 weeks) radiographic results were dorsal angualtion 7±4 , corresponded to preoperative 48±7 , and immediately postoperative 6±4 The complications such as limitation of movement, increase of dorsal angulation, rotational malalignment, shortening, and depression of the head of metacarpal were not occurred. Rotational deformity was always well controlled. Correction of angulation was good and K-wire insertion and fixation technique were easy. We recommend this technique in case of over 40 dorsal angulation of fracture site due to absence of contact between the palmar fractured ends, and patients who dont accept the cosmetic deformity or want early exercise.
Citations
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