Figure 7
From: The highly accurate anteriolateral portal for injecting the knee
Sonographic Visualization of Direct Intraarticular Injection. After the needle tip is advanced until it palpably engages the medial femoral condyle, lidocaine is injected showing fluid movement into the intraarticular space and dilation of the intraarticular space. Here intraarticular movement of fluid is demonstrated by color Doppler at the needle tip with simultaneous dilation of the intraarticular space.