| To measure and evaluate the posterior slope angle of medial tibial plateau of healthy and arthritic knees for providing clinical data in total knee arthroplasty and the knee prosthesis design that suits for Chinese people, and supplying parameters in designing of internal fixator for proximal tibias. Methods10 healthy patients, whose knees were diagnosed of no diseases in rela tionship with the knee joint, which were confirmed by radiologic examinat ion in our hospital, were collected, and 32 patients, consisting 40 knees, which met the criteria of knee arthritis were collected also.These pati ents and knees included twenty two females and twenty males, twenty eight right knees and twenty two left knees. The ages averaged 56 years, ranging from 16 to 85 years. According to the grade classification of Kellgren a nd Laerence, the knee arthritis consisted of 5 grades. Every patient inclu ded in the study was required to take a full-length standing X-ray film o f the lower extremity or the lateral standing X-ray film should include t he position 20cm below the joint line. the posterior slope angle of medi al tibial plateau were measured on lateral radiograghs based on three lin es:anterior tibial cortex tangent line (Method One), tibial proximal ana tomical axis (Method Two) and posterior tibial cortex tangent line (Metho d Three). The data, in relationship with the posterior slope angle of med ial tibial plateau of healthy and arthritic knees between the male and fe male, lateral and medial side, three different methods, three different c hinese medical certificate types, Osteoarthritis decentralized by the g Ke llgren and Laerence, were analyzed. All datas were analyzed statistically using SPSS17.O, Use of samples t test comparing the measured data differe nee between the every two group, comparision of the measurement data wereexpressed by mean±standard deviation(x±s), and the data were tested with normal distribution and homogeneity of variance test. If the data ace orded with normal distribution and homogeneity of variance test, t-test we re used,but if not approximate t-test that t'test were used. Count data were tested with chi square test,the results were considered statisticall y significant when a=0.05, P<0.05.The posterior slope angle of medial tibial plateau angles measured by the three different methods in all patients and the datas are below:the method one was 13.23°±2.72°,the method two 10.80°±2.73°and the method three 8.53°±2.95°; the male posterior slope angle of medial tibial plateau angles were 13.03°±2.91°,10.43°±2.67°,8.00°±2.70°respectively; the female posterior slope angle of medial tibial plateau angles were 13.40°±2.60°,11.80°±2.79°,8.95°±3.09°respectively; the posterior slope angle of medial tibial plateau angles of the healthy knee were 13.98°±2.45°,11.28°±2.43°,8.96°±2.55°; the PS of the patients belong to three different methods were 12.98°±2.88°,10.06°±2.53°,8.26°±2.57°; the PS of the patients belong to the three different chinese medical certificate types were 12.98°±2.88°,10.06°±2.53°,8.26°±2.57°,14.12°±2.34°,11.96°±2.48°,10.07°±2.13°,13.16°±2.69°,11.31°±2.46°,8.85°±2.73°respectively; the posterior slope angle of tibial plateau of the arthritic knees belong to grade 1 to grade 4 were 14.28°±2.85°,11.48°±2.78°,9.08°±2.21°,14.30°±2.00°,12.20°±2.35°,10.13°±2.53°, 13.17°±2.07°,11.02°±2.28°,9.04°±2.79°,10.42°±2.43°,7.97°±2.61°,5.48°±2.85°respectively. By statistical analysi, the posterior slope angle of medial tibial plateau angle were significant among the three different methods, and also between the healthy knee and the arthritic knees of grade 4, in other words, the PS decreased obviously in severe arthritic patients (P<0.05). but there were not a statistical significant between the male and female, the left and the right knees, the three different chinese medical certificate types, but also the healthy knees and the arthritic knees belong to grade 0-grade 3 (P>0.05)There were not statistical significant difference between the male and female, the left side and the right side, he three different chinese medical certificate types, the healthy knees and the arthritic knees belong to grade 0-grade 3 classificated by Kellgren and Laerence (P>0.05).the posterior slope angles of medial tibial plateau were significant among the three different methods, and also between the healthy knees and the arthritic knees of grade 4. The geometry of tibial plateau in Chinese people shows significant different comparing western people. The characteristics of Chinese people must be sonsidered when we use the tibial plateau prosthesis designed by the westerner. And these differences should also be taken into account when we design the domestic tibial plateau prosthesis and total knee arthroplasty.
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