[Arthroscopy of the Trapeziometacarpal and Metacarpophalangeal Joints.].

Indications for small joint arthroscopy in the hand remain poorly understood. This is due to a paucity of papers discussing this technique in the literature, as well as inadequate hands on training in the pearls and pitfalls regarding this application within the commonly used "scope" of arthroscopy. Despite the fact that small joint arthroscopes have been available for over a decade, hand surgeons have been slow to adopt this technique within their treatment armamentarium for the treatment of both traumatic and degenerative conditions involving the thumb and the digital metacarpophalangeal joints. A proposed arthroscopic classification for basal joint osteoarthritis provides additional clinical information and can direct further treatment depending on the stage of disease. This chapter will also review the brief history of trapeziometacarpal arthroscopy and provide insight as to how this technique can be incorporated into a treatment algorithm in managing this common affliction. Metacarpophalangeal joint arthroscopy is even less commonly used, while traumatic and overuse injuries are frequently seen in the thumb, and present an ideal indication in certain scenarios. Painful conditions affecting the metacarpophalangeal joints of the fingers are less commonly seen, yet the small joint arthroscope presents a much clearer picture of the present pathology compared to other imaging techniques or even open, and potentially deleterious, surgery. The application of this technology to the smaller joints will soon make the treating surgeon realize that a myriad of pathologies are readily visible and can augment treatment, as well as diagnosis. Similar to the wrist, small joint arthroscopy may one day supplant imaging techniques such as MRI or CT in establishing an accurate diagnosis.