Knee, left and right, ultrasound scan of, if:(a) the service is used for the assessment of one or more of the following suspected or known conditions:(i) abnormality of tendons or bursae about the knee;(ii) a meniscal cyst, popliteal fossa cyst, mass or pseudomass;(iii) a nerve entrapment or a nerve or nerve sheath tumour;(iv) an injury of collateral ligaments; and(b) the service is not performed in conjunction with a service mentioned in item 55880 (R)