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The metacarpal index (MCI) provides normal values for British children and adults, useful for assessing skeletal conditions. This index, calculated using the left hand, aids in diagnosing conditions like Marfan syndrome.
Area of Science:
- Pediatric Radiology
- Skeletal Dysplasias
- Anthropometry
Background:
- The metacarpal index (MCI) is a valuable anthropometric tool.
- Establishing normative data is crucial for clinical interpretation.
Purpose of the Study:
- To determine normal values for the metacarpal index (MCI) in British children and adults.
- To provide reference curves for assessing skeletal abnormalities.
Main Methods:
- Determination of metacarpal index (MCI) values in a British cohort.
- Age- and sex-specific percentile curves were generated.
- Standard radiographic measurements of metacarpal bones were utilized.
Main Results:
- Normal MCI values were established for British children and adults.
- The index shows a consistent rise during childhood, peaking around 16 years, followed by a slight decline in adulthood.
- Curves are applicable to children of diverse ethnic origins.
Conclusions:
- The determined MCI values offer a reliable reference for pediatric and adult populations.
- MCI assessment, particularly using percentile values, aids in the clinical evaluation of skeletal conditions associated with arachnodactyly, such as Marfan syndrome.
- The left hand is recommended for MCI calculation.
Abstract:
Normal values for the metacarpal index (MCI) in British children and adults have been determined. In infancy before the appearance of the metacarpal epiphyses the index is constant up to about two years of age (5.2 in males and 5.5 in females). During childhood the index rises to reach a peak at about 16 years, and then falls slightly during adult life. The curves produced are almost identical to those previously found in black children, and one set of values may be used for children of either ethnic origin. The left hand should be used to calculate the MCI, and the results expressed as either below the mean for age, or in terms of percentile for age above the mean. Curves are presented showing percentile values. No attempt should be made to produce a clear distinction between normal and abnormal indices, but the percentile value used in conjunction with other clinical findings in the assessment of Marfan's syndrome and other skeletal conditions associated with arachnodactyly.