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Background Spiral and comminuted fractures of the metacarpals are rotationally and axially unstable fractures with a tendency to shorten, which in turn causes significant extensor lag and loss of grip strength. We have designed a new, cheap and locally developed method of locked intramedullary nailing of these metacarpal fractures. We are presenting the results of our first 21 patients with 22 fractures treated by closed, fluoroscopically assisted, intramedullary K-wiring with proximal locking done by a specially designed locking pin. Materials and Methods This was a retrospective, observational cohort study of all patients with spiral and comminuted fractures of metacarpals with minimum of 1 year of follow-up and average follow-up of 14 months (range, 12 to 26 months). The patients were evaluated clinico-radiologically using range of motion, extensor lag, time to healing, amount of collapse, angulation and rotation and complications. Results All fractures had healed uneventfully with average time to union being 8 weeks. Average metacarpal shortening was 2.04±0.95 mm, while the average post-operative angulation of the fracture was 4.81°±1.7. The metacarpophalangeal range-of-motion recovered almost fully with the average extensor lag being only 5.22°±2.42. Other than extensor tendinitis in two patients, there were no other complications. Conclusions This method is cosmetically appealing, provides stable fixation, avoids periosteal stripping associated with open reduction and is associated with very low complication rate, and thus can be safely and effectively used for the treatment of these difficult fractures.