Changes of Intraarticular Temperature in the Knee Joint according to the Application Method of Cold Jet-stream

OBJECTIVE: To investigate the changes of intraarticular temperature in the knee according to the application methods of cold jet-stream and to find the more effective method which reduces the intraarticular temperature. METHOD: Fifteen healthy subjects were examined. We recorded both skin and intraarticular temperature of the knee for 120 minutes. We compared two different cooling methods using -30 degrees C cold jet-stream by CRAis(R) (Century, Korea). The first was the intermittent cold jet-stream application method (ICA) which applied cold jet-stream to the knee joint every other minute for 5 minutes and the second was the continuous cold jet-stream application method with infrared (CCAI) for 5 minutes. RESULTS: In ICA, the intraarticular temperature maximally dropped as 1.7+/-0.6 degrees C (p<0.01) and it took 28.7+/-18.9 minutes. Intraarticular temperature dropped 0.6+/-0.5 degrees C after 2 hour (p<0.05). In CCAI, the intraarticular temperature maximally dropped as 2.8+/-0.7 degrees C (p<0.01) and it took 38.0+/-24.6 minutes, intraarticular temperature after 2 hour dropped as 1.36+/-0.75 degrees C (p<0.05). According to the two methods, CCAI showed more reduction in the lowest and after 2 hour intraarticular temperature compared with ICA in the knee joint (p<0.05). CONCLUSION: CCAI is better for reducing the intraarticular temperature than ICA.

The Relationship between Body Mass Index and Foot Parameters

OBJECTIVE: To evaluate the relationship between body mass index (BMI) and foot parameters. METHOD: We examined 1, 107 feet of 872 volunteers (male: 325, female: 547) with 3D foot scanner (Nexcan , K & I, Korea). The relations of BMI and foot parameters were analyzed by partial correlation analysis with adjusted height. We classified subjects into 4 groups by BMI; low-weight (25 kg/m2) group. The relations of these groups and foot parameters were analyzed by univariate ANOVA with fixed height. RESULTS: Instep point length, ball width and girth, waist, instep height and girth, and vamp height showed a positive relation to BMI (p0.05). CONCLUSION: This study showed that BMI was positively related to height, width, girth of foot. But, BMI had no significant relation to length of foot, and medial longitudinal arch.