title: Clinical studies on posterior cruciate ligament tears have weak design.
mesh_terms: D006801:Humans; D016014:Linear Models; D010043:Outcome and Process Assessment, Health Care; D016119:Posterior Cruciate Ligament / Q000293:injuries / Q000601:surgery*; D019651:Plastic Surgery Procedures; D012107:Research Design; D018709:Statistics, Nonparametric