- 期刊
以關節鏡探討PGT（Patella Grinding Test）之診斷價值
Correlation of Patella Grinding Test with Arthroscopic Findings
摘要
作者利用民國70年8月至民國74年1月間，在台北市中興醫院接受關節鏡檢查的313例患者為研究的對象，探討PGT (patella grinding test)的可靠性。313例中，男性147例，女性166例，年齡自18歲至69歲間，而以20多歲與50多歲之患者最多。右膝占168例，左膝145例。 313例的患者中，PGT(＋)的有250例，占全部的79.87%，以女性之患者較多。250例中有197例 (78.80%)患者經關節鏡證顯具有並髕骨軟骨軟化症，亦以女性占多數有119例，但與年齡之大小無顯著關係。PGT(＋)中有53例證實髕骨完全正常，故PGT之錯誤的正反應( false positive )有53例。PGT(－)有63例，但經關節證實具有軟骨軟化者34例，即PGT之錯誤的負反應 ( false negative )有34例。PGT之診斷特異性 ( diagnostic specificity ) 是78.8%，而診斷敏感性 (diagnostic sensitivity)是46.03%，男性患者的診斷特異性較低是72.22%，女性患者則高達83.80%。 第一級髕骨軟骨軟化的患者，較易造成錯誤負反應的診斷，第3、4級的軟化，未使PGT正反應之比率有增多的趨勢，其中仍有百分之十多的患者呈PGT(－)。
關鍵字
無資料並列摘要
The authors analyzed the diagnostic value of patella grinding test based on 313 arthroscopies with available record as regard PGT, which were performed from Aug. 1981 to Jan. 1985. Among them 147 cases male, 166 female; ranking from 18to 69 years of age with more cases within the 3rd and the 6th decade, right knees were involved a little bit more than left ones. Positive PGT was demonstrated in 250 of 313 knees (79.87%). Patellar chondromalacia was revealed by arthroscopy in 197 of theses 250 knees (78.80%). There were 53 false positive PGT which was more over males. Arthroscopy showed definite patellar chondromalacia in 34 of 63 knee with negative PGT. Based upon the aforementioned data, the diagnostic specificity of PGT was made out to be 78.80%, and the diagnostic sensitivity was 46.03%. The specificity of PGT was higher among females. False negative PGT was found more frequently in the knees with grade 1 patellar chondromalacia. In addition, the percentage of false negative PGT was not further reduced despiting advancement of patellar chondromalacia from grade 2 to grade 4. Although PGT ran a parallel relationship with patellar chondromalacia, the present study failed to show PGT as a absolute pathognomonic sign of patellar chondromalacia.