SUMMARY Congenital carpal coalitions are rare conditions that arise from a failure or an incomplete cavitation of a common cartilaginous precursor of the carpal bones between the fourth and eighth week of intrauterine life. The incidence of coalitions has been estimated to occur in about 0.1% of the population and up to 1.6% in people of African descent. This study reports a case of trans-scaph...

The human carpal bones, as in most mammals, are usually eight in number, and develop from a common embryological origin by the eighth week of intrauterine life 1. Failure of separation during this development leads to the phenomenon of carpal coalition. The prevalence of the anomaly is uncertain as it is usually asymptomatic 2. Individual cases have been reported which have presented as unusual...

Carpal instability nondissociative (CIND) represents a spectrum of conditions characterized by kinematic dysfunction of the proximal carpal row, often associated with a clinical "clunk." CIND is manifested at the midcarpal and/or radiocarpal joints, and it is distinguished from carpal instability dissociative (CID) by the lack of disruption between bones within the same carpal row. There are fo...

The roentgen appearance and pathogenesis of carpal instability are described in an evaluation of patients and cadavers with rheumatoid arthritis and calcium pyrophosphate deposition disease. Dorsiflexion (16%) and palmar flexion (8%) instability occurs in rheumatoid arthritis, particularly in patients with moderate to advanced disease. Navicular-lunate dissociation frequently accompanies dorsif...

Synostosis of carpal bones originates from lack of cavitation at the site of the future joint space with subsequent chondrification and ossification during the 4 to 8 weeks of intrauterine life. It is mostly seen as a chance finding discovered on radiographs. These coalitions are often asymptomatic, but can give complaints after trauma. We report six patients with different congenital carpal co...

  Radial polydactyly, the most common digital duplication in Asian and white populations, has a wide range of manifestations. Its classification is useful for planning and assessing surgical treatment. Our patient had four thumbs, duplicated radial carpal bones, and a bifurcated radius. This presentation is not covered by any of the current classifications. To the best of our knowledge, this is...

The concept of carpal instability has evolved considerably over the past few years. Initially, the term ‘instability’ was considered to be synonymous with ‘malalignment’. A wrist was regarded as unstable when there was an alteration of the sagittal and/or anteroposterior alignment of the carpal bones beyond what was judged to be normal. Based on this, four major types of carpal malalignment wer...

The wrist represents a complex anatomic region in the human extremity and a highly functional and intricate structural joint. Most perilunate injuries result from a staged disruption of the ligamentous structures. Forces may be directed through the carpal bones themselves resulting in a fracture. Early anatomic reduction of any carpal malalignment is of the utmost importance. Unfortunately, eve...