Dislocations of the fourth and fifth carpometacarpal joints (CMCJs) are rare and often misdiagnosed via radiography. Moreover, treatment strategies have not yet been standardized. Herein, we report a case of chronic dislocations of the fourth and fifth CMCJs with delayed diagnosis and successful treatment via ligament repair. A 29-year-old male patient who was initially diagnosed with contusion at another center following a fall on the stairs was referred to our hospital one month later due to persistent pain and swelling. Fourth and fifth CMCJ dislocations were diagnosed using radiography and computed tomography. Closed reduction attempts were unsuccessful, prompting open reduction. The operative findings included rupture of the dorsal carpometacarpal ligament and hamate cartilage injury. Using two mini anchors, the fourth and fifth dorsal carpometacarpal ligaments were repaired, and Kirschner-wire (K-wire) pinning was performed. The K-wire was extracted after four weeks. At the eight-month follow-up, the only remaining symptom was mild discomfort, and the range of motion and grip strength was fully recovered. Our findings highlight the difficulties in diagnosing CMCJ dislocation and suggest ligament repair as a treatment option for chronic cases of CMCJ dislocation.

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BACKGROUND: Giant cell tumors grow locally invasive with osseous and soft tissue destruction, requiring wide resection to avoid recurrence. Stable reconstruction of the first carpometacarpal (CMC-1) joint remains a challenge due to its high range of mobility. The latter is of paramount for the functionality of the hand.
OBJECTIVE: Therefore, the aim of this study was to report our approach for a combined reconstruction of the first metacarpal and the CMC-1 joint.
METHODS: A 58-year-old woman underwent wide resection of a benign giant cell tumor at the base and shaft of the first metacarpal of the left thumb. Because of the loss of the CMC-1 joint and the instability of the thumb, an osseous reconstruction using a vascularized fibular graft combined with a TOUCH Dual Mobility CMC-1 prosthesis was performed to reconstruct the CMC-1 joint.
RESULTS: Osseous healing was observed after 3 months. No tumor recurrence and good joint function were documented at the follow-up investigation after 1 year. The patient reported only minor restrictions during activities of daily living. Thumb opposition was possible with a Kapandji score of 8/10. A slight pain while walking remained as a donor-side morbidity at the right lower leg.
CONCLUSIONS: Metacarpal reconstruction with vascularized fibula bone grafts allowed a combined joint reconstruction with a commercially available prosthesis, which is an approach to restore the complex range of motion of the thumb.

Thumb carpometacarpal (CMC) osteoarthritis is painful and debilitating. Here, we explore outcomes of a modular, press-fit thumb CMC hemiarthroplasty prosthesis (BioPro). This surgical option permits minimal bone resection, sparing the trapezium, hence allowing revision options if necessary. A retrospective review of all cases of the modular thumb CMC implants performed at one community US center between 2018 and 2021 were included and invited for email or telephone review. Electronic records were examined for demographics, patient outcomes, and morbidity. Eleven patients underwent 11 thumb CMC joint hemiarthroplasties, mean age was 64.8 years (SD: 7.68 y), with 6 females. Six received surgery on their dominant extremity. Two were manual workers (both in the medical field), 6 office-based, 2 retired, and 1 homemaker. The preoperative median pain score (Visual Analog Score) was 8/10 (range: 5 to 10), reducing to 1/10 (range: 1 to 10) ( P =0.000033) with a median follow-up of 23 months (range: 13 to 39 mo). In all, 8/11 patients reported they would recommend this surgery to friends and family and opt for the same surgery on their contralateral hand if necessary. One patient reported persistent pain a year postoperatively. On review, the head of the implant was placed too deep into the trapezium. Another center found that this patient had a postoperative trapezium fracture and underwent revision with implant removal and conversion to a suspension arthroplasty. At 12 months, 10/11 thumb CMC hemiarthroplasty showed good pain relief, function, and patient satisfaction. The BioPro has a low risk of subluxation and allows salvage options to remain available should failure occur.

A floating metacarpal is defined as the simultaneous dislocation of the metacarpophalangeal (MCP) and carpometacarpal (CMC) joints. Metacarpal dislocations are rare, and floating metacarpals with double dislocations are extremely rare. In this article, we present a very rare case of floating metacarpal in which the first MCP and CMC dislocations were found simultaneously and successfully treated with closed reduction, open reduction, and Kirschner wire fixation methods.

BACKGROUND: Multiple carpometacarpal fractures and dislocations are rare. This case report describes a novel multiple carpometacarpal injury, namely, \'diagonal\' carpometacarpal joint fracture and dislocation.
METHODS: A 39-year-old male general worker sustained a compression injury to his right hand in the dorsiflexion position. Radiography indicated a Bennett fracture, hamate fracture, and fracture at the base of the second metacarpal. Subsequent computed tomography and intraoperative examination confirmed an injury to the first to fourth carpometacarpal joint along a diagonal line. The normal anatomy of the patient\'s hand was successfully restored via open reduction combined with Kirschner wire and steel plate fixation.
CONCLUSIONS: Our findings highlight the importance of taking the injury mechanism into account to avoid a missed diagnosis and to choose the best treatment approach. This is the first case of \'diagonal\' carpometacarpal joint fracture and dislocation to be reported in the literature.

To our knowledge, the use of occupational performance in education on joint protection techniques has not been studied for individuals with thumb carpometacarpal (CMC) osteoarthritis.
This case series was designed to investigate if occupation-based instruction inside the clinic was useful and found satisfactory as an educational tool for individuals with thumb CMC joint arthritis.
Three participants with thumb CMC joint osteoarthritis performed washing, rinsing, and drying a dish, moving a pot and pan, maneuvering a laundry basket, and pouring from a pitcher during joint protection education in the therapy clinic with a skilled hand therapist in addition to routine treatment. Satisfaction with this intervention was assessed via a 3-question satisfaction survey. Pain with activity and function via the Thumb Disability Examination were assessed at baseline and a 4week follow up.
Patients in this study expressed satisfaction with the inclusion of the performance of occupations in their joint protection education in the clinic. Pain with activity improved by an average of 1.7/10 on a 10-point Numeric Pain Rating Scale and function improved by an average of 10.04 on the Thumb Disability Examination.
Although no causal relationships can be assumed in this study, hand therapists should consider adding occupation-based intervention as a component of patient education on joint protection for individuals with thumb CMC joint osteoarthritis.

Thumb carpometacarpal (CMC) arthroplasty with resection of the trapezium and soft tissue interposition, with or without ligament reconstruction, has historically proven to be an efficacious treatment for thumb CMC arthritis. The incidence of failure following primary thumb CMC arthroplasty is low; however, the evaluation and management of a patient experiencing an unsatisfactory outcome following CMC arthroplasty is challenging. If symptoms are refractory to conservative measures, then revision surgical treatment may be indicated. Clinical decision making becomes even more complicated in cases of failure after an initial revision surgery has already been performed. In patients with a failed CMC arthroplasty revision in whom all soft tissue options have been exhausted, the senior author considers arthrodesis of the first metacarpal base to the second metacarpal base as a salvage procedure. The authors describe this surgical technique and present our experience with 4 cases in 3 patients who underwent this surgical intervention. Successful radiographic fusion was achieved in all 4 cases, with satisfactory clinical outcome in 3 out of 4 cases, supporting this surgical technique as a definitive option for patients who have failed multiple CMC arthroplasty revision surgeries.

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