Wrist joint; ligament/injury; follow-up study The navicular and lunar bones of the wrist play an important role in transmitting forces and maintaining the stability of the wrist joint. Injury to the navicular interlunar ligament affects the stability of the navicular interlunar bone, resulting in wrist instability and dysfunction. There are various clinical treatments, but they are ineffective and affect the functional recovery of the wrist joint. Surgical method An “s” shaped incision is made along the dorsal side of the wrist in the direction of the thumb extensor tendon, and the third extensor tendon sheath is opened layer by layer, the thumb extensor tendon is tracted to the radial side, and the fourth extensor tendon sheath is opened through the third extensor tendon sheath. The dorsal interosseous nerve at the back of the wrist was exposed and the 2-cm long nerve segment was excised. A “V” shaped incision is made between the dorsal radial deltoid ligament and the intercarpal ligament according to the Bishop’s method to create a joint capsule flap with the radial aspect of the wrist joint as the tip. The dorsal carpal capsule was lifted to reveal the proximal navicular bone and the lunate bone. Two 1.2-mm diameter restoring kerf pins were drilled into the navicular bone and lunar bone from the dorsal to the palmar direction. A hole is drilled in the navicular bone (or lunar bone) and the Mitek bone anchor is inserted into the proximal navicular bone. The navicular bone is repositioned from the palmar flexion position and the lunar bone from the dorsal rotation position by repositioning kerf pins, and then 2 fine kerf pins are drilled subcutaneously parallel to the lunar bone through the navicular bone to maintain the position between the navicular bone and the lunar bone and prevent their separation, and a third kerf pin is drilled subcutaneously from the navicular bone to the cephalic bone to prevent the navicular bone from palmar flexion. The bone anchor suture was forcefully sewn to the residual interlunar ligament of the navicular bone, and the position of the navicular and lunar bones was observed by fluoroscopy on a C-arm X-ray machine. 5-0 absorbable sutures were used to close the dorsal carpal capsule and the third extensor tendon sheath. After surgery, the forearm was externally fixed with a plaster brace, and the plaster brace was removed after 8 weeks, and functional exercises were started with the removal of the kyphosis pin. The main difficulty is that the interlunar ligament exists between the navicular bone and the lunar bone and is a ligament with a thickness of only about 3 mm, which is mostly torn from the navicular bone and the lunar bone when the ligament is injured. The disadvantage of ligament reconstruction surgery is that the surgery is more traumatic and requires drilling holes in the navicular lunar bone to penetrate the transplanted tendon, so it is difficult to achieve anatomical reset of the navicular lunar bone and the effect is not good; the navicular lunar bone fusion surgery is difficult to operate and the postoperative fusion rate is not high. At present, some scholars try to use bone anchor to treat the avulsion injury of finger tendon at the bony attachment point and reconstruct the extensor tendon stop. The operation method is to drill a 5mm deep hole in the finger bone at the tendon attachment point, implant the bone anchor completely into the finger bone, fix it firmly in the finger bone, and then suture the anchor tail to the avulsed finger tendon to reconstruct the tendon stop. The advantage of this technique is that it is a simple method with minimal trauma and stable and reliable results. The diagnosis of interlunar ligament injury can be confirmed under direct wrist arthroscopy, but in China, wrist arthroscopy is not popular, so it is especially important to diagnose interlunar ligament injury by imaging changes in the wrist joint. The diagnostic criteria used are navicular lunar spacing >3mm and navicular lunar angle >70º. In addition to the conventional wrist frontal and lateral radiographs, a wrist ulnar deviation of 20º is also used. When the wrist is ulnar deviated by 20º, the gap between the navicular lunar bones is increased, which is very helpful for the diagnosis of interlunar ligament injury. It is important to accurately reset the navicular lunar bone during surgery. Because the navicular and lunar bones are small in shape, it is difficult to reset them accurately with conventional methods. The author inserted a 1.2L diameter Kirschner needle into the navicular lunar bone, and accurately reset the navicular lunar bone by moving the reset Kirschner needle. In order to prevent separation of the navicular lunar bone, two Kirschner needles were used to fix the navicular bone and the lunar bone between them, and the navicular bone must be maintained with the Kirschner needle to prevent palmar flexion of the navicular bone during surgery. One patient in our group had a postoperative follow-up with a separation between the navicular and lunar bones again and a gap of >5 mm between the navicular and lunar bones, which may be related to the inexperience of the first operation, the incomplete reset of the navicular and lunar bones during the operation, and the failure to fix the navicular and lunar bones with a Kirschner pin. Clinical studies have shown that removal of the dorsal interosseous nerve can significantly reduce pain after wrist injury. The author also resected the interosseous dorsal nerve during surgery, with the advantage that the interosseous dorsal nerve resection and ligament repair could be completed within 1 surgical incision. Follow-up results showed a reduction in postoperative wrist pain, which was associated with the elimination of the cause of postoperative wrist instability and the removal of the interosseous dorsal nerve.