Or Upload an image for you and others searching for #lowEF #physicalexam #test #knee #msk #clinical #injury #video #ligament #instability #orthopedics #sign #acl #positive #posterior #stability #valgus #drawer #tear #varus #pivot #mcl #pcl #elbow #ortho #posterolateral #plc #rcl #nsfw #stress #shift #cruciate #lcl #sports #lachmans