Basal joint arthroscopy indications in first CMC joint arthritis.

Basal joint arthroscopy is one of the more recent evolutions of small joint arthroscopy in upper limb surgery. Conventional arthroscopy equipment is generally sufficient to perform these procedures without any specific adaptation. Arthroscopic exploration of the trapeziometacarpal joint is performed through 1R, 1U portals with the addition of a thenar portal in some indications. In the context of basal joint arthritis, we can distinguish diagnostic, preventive and therapeutic indications for arthroscopy. Diagnostic indications are the assessment of painful post-traumatic basal joint lesions of cartilage and ligaments, and the evaluation of chondromalacia and ligament attenuation to help classify basal joint osteoarthritis to provide additional clinical information, which can influence further treatment depending on the stage of the disease. Preventive indications are reduction of Bennett's fracture, basal joint dislocation management to avoid post-traumatic instability and chondromalacia; it can also be indicated after decompensation of hyperlaxity. Therapeutic indications are debridement, ligament augmentation procedures or shrinkage ± interposition ± partial or total trapeziectomy, ligamentoplasty, etc. Basal joint arthroscopy appears to be the seat of advances in arthroscopic procedures with clinical results at least as effective as classical open surgery, but this technique still requires long-term evaluation.