12. 1Proximal EndInterface point with the eye or video equipment 2Distal EndFurthest point from the proximal end or users eye 3Insertion Diameter The diameter quoted as the actual diameter inserted into the anatomy of endoscope sheath 4Instrument AxisThe axis of the instrument relative to the instrument axis 5Optical AxisThe axis of the optical path which is displaced to the instrument axis 6Angle of ViewThe angular value of displacement to the optical axis 7Optical Field of ViewThe area which the conical system covers is as a cone 8Fiber Illumination The area which the fiber illumination covers as a cone and is greater than the optical field of view 9Working LengthThe actual length embodying the insertion diameter which can be applied 10Light PostInput point of the illumination when connected to a light guide and source 11Eyeshield Used as a cup for the eye or a diameter for the attachment of video camera equipment

13. Originally designed for use with the eye, the eyeshield is now used to fit a camera via an optical "coupler". For glass on glass the eye-shield and sub-assembly is replaced with a unique fitting which dedicates the endoscope to a particular manufacturers camera product.

17. PATIENT POSITIONING Arthroscopic portals. L = lateral site; M = medial site. Arthroscopic aiming over the medial meniscus.

18. Skin incision on anteromedial aspect, 2 cm from the tibial tubercle and 6 cm below the medial joint line

19. Stripping of gracilis, with firm countertraction to deliver the tendon out of the incision The two tendons have been stripped, and will subsequently be detached from their distal insertions

20. Measuring graft The tendons have been sutured together. Schematic diagram of the graft