[Limb-length measurements using wooden boards: an accurate and experience-independent method].
OBJECTIVE
To determine the precision and reliability of the indirect limb-length measurement, and the inter-observer variance between doctors differing in level of experience.


METHODS
Descriptive.


METHODS
Indirect limb-length measurement by placing 0.5 cm-thick wooden boards under the foot of the shorter leg until the difference in length was corrected, was performed by 3 observers differing in experience (medical student, resident and orthopaedic surgeon) on 66 patients with unilateral femoral-shaft fractures treated with a femoral nail. The group of patients consisted of 51 men and 15 women with a median age of 30 years (range: 18-90). In total 17 observers participated and 177 limb-length measurements were performed. The measurements obtained were compared with limb-length measurements obtained by orthoradiograms of the entire leg.


RESULTS
Of the 177 indirect limb-length measurements, 144 (81%) differed by 0-1.0 cm compared with the limb length obtained by orthoradiogram. There was no statistically significant difference in the limb-length measurements obtained by the three groups of observers with different experience levels. There was a certain degree of correlation between values measured by medical students and residents (r = 0.7). When comparing the measurements carried out by staff members with those of residents and medical students, respectively, a lower degree of correlation was found (r = 0.6 and 0.5, respectively).


CONCLUSIONS
Indirect limb-length measurement with wooden boards was accurate. Experience did not play an essential role.
Pakvis
D F M
DF
Universitair Medisch Centrum St Radboud, afd. Orthopedie, Postbus 9101, 6500 HB Nijmegen.
Jaarsma
R L
RL
van Kampen
A
A
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000886:Anthropometry / Q000295:instrumentation / Q000379:methods; D002983:Clinical Competence; D005260:Female; D005264:Femoral Fractures / Q000150:complications; D006801:Humans; D007870:Leg Length Inequality / Q000175:diagnosis* / Q000209:etiology; D035002:Lower Extremity / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000473:pathology; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D011859:Radiography; D015203:Reproducibility of Results