Objective To investigate the correlation between knee joint line and anterior knee pain after total knee arthroplasty (TKA).Methods From January 2008 to December 2010,76 patients with osteoarthritis underwent primary TKA in our hospital,including 11 males and 65 females,aged from 47 to 83 years (average,68.88±7.61 years).Fixed-bearing posterior stabilized TKA (PFC) was used in all patients.All patients were followed up every 12 months after TKA.According to the Figgie's method,pre-and post-operative knee joint line was measured,and the changes of pre-and post-operative knee joint line were calculated.If the knee joint line was elevated,it was defined as positive; on the contrary,it was defined as negative.The Feller's patellar score was used to assess pre-and post-operative patellar function.The correlation between joint line level and Feller's patellar score was analyzed 24 months after operation.Results The joint line level ranged from-6.8 to 10.44 mm (average,2.69±3.31 mm).With the rise of the joint line,the patient's patella score decreased.There is a negative correlation between the elevated joint line level and Feller's patellar score (r=-0.763,P=0.000).The Feller's patellar score decreased with the fall of joint line level,and there is a positive correlation between them (r=0.914,P=0.000).The Feller's patellar score was higher in patients whose joint line change was less than 4 mm than that in patients whose joint line change was greater than 4 mm (t=12.648,P=0.000; t=l 1.775,P=0.000).Conclusion The joint line change was correlated to anterior knee pain after TKA with fixedbearing posterior stabilized prosthesis.The joint line change less than 4 mm can result in a better knee joint function.

Objective To explore the significance of palpation-negative breast tumor resection with ultrasound-guided methylene blue labeling and percutaneous suture traction.Methods 46 cases of small breast tumors with the diameter from 0.5 cm to 1.0 cm were double labeled with methylene blue under the guide of ultrasound l hour preoperatively.The tumors were fixed,drew outward with percutaneous suture and resected accurately.All the 46 cases were rechecked by ultrasound to verify whether residual or false resection occurred 1 month later.Results All the 58 tumors of the 46 patients were accurately resected.No residue or false resection occurred.The average operation duration was 10 min to 20 min.Conclusion Palpable-negative breast tumor resection with ultrasound-guided methylene blue labeling and percutaneous suture traction has the advantages of small invasion,accurate positioning and short operation duration.

Objective We invented mammary lump skin-positioning membrane (named scare membrane) to facilitate localization of mammary lump during ultrasound scan.This study is to measure the radius of mammary of Chinese adult women for designing different types of skin-positioning membrane.MethodsThe radius of mammary glands in 236 cases of adult females was detected with color Doppler ultrasound at 5 different clock positions:12:00,3:00,6:00,9:00 and 10:30 or 1:30.SPSS 16.0 statistical software was used to analyze the data.The cut-off values of mammary glands radius at 99％,95％,75％ and 50％ were calculated.Paired t tests or nonparametric tests (relative sample rank sum tests) were used to verify the consistency of mammary gland radius between left and right sides.ResultsThe cut-off value of 95％ mammary gland radius was:7.700cm at 12:00,7.810 cm at 13:00,8.100 cm at 3:00,5.330 cm at 6:00 and 6.300 cm at 9:00 for left mammary gland ; 7.500 cm at 12:00,6.015 cm at 3:00,5.500 cm at 6:00,8.510 cm at 9:00 and 7.930 cm at 10:30 for right mammary gland.In comparison of left and right mammary gland radius,the difference had statistical significance between the group of left side at 1:30 and right side at 10:30,the group of left side at 3:00 and right side at 9:00(P ＜0.05).The right mamma was relatively larger.The cut-off values of the right mamma at the above two clock points were taken as radius of scale membranes while the average of percentage cut-off values at 12:00,3:00 of both mammas,left side at 9:00 and right side at 3:00 are taken as radius of scale membranes.ConclusionsAccording to the cut-off values of 99％,95％,75％ and 50％ radius of adult female mammary glands,mammary lump skin-positioning membrane radius can be classified into 4 size-types:extra large,large,medium and small.The precise classification of radius of mammary scale membranes according to mammary glands of adult females provides convenience for production,manufacture and clinical application of mammary lump skin-positioning membrane.