Patient-matched osseointegrated prostheses for thumb amputees: a cadaver and feasibility study.

Thumb amputations affect 50% of hand functionality. Common solutions consist of microsurgical treatments or silicone vacuum prosthesis. Not all patients are eligible for microsurgical treatment and the use of vacuum prosthesis is often discouraged because of their instability. On the contrary, osseointegrated prosthesis provide stable retention and osseoperception. This cadaveric study evaluated the process of a patient-matched osseointegrated prosthesis for the treatment of thumb amputees. Computed tomography (CT) medical images reconstruction provided information on metacarpal stump, used as input for the parametric screw design. Preoperative planning guided the surgeons in the surgery: postoperative placement confirmed the accuracy of the preoperative planning. Surgeons were directly involved in the implant design to meet their requirements and patient needs. Implants were inserted into cadaveric specimens in one-stage surgery. A similar process can be adopted and exploited for the treatment of different levels of thumb amputations and long finger amputations.

Comparative Analysis of Prosthetic (Touch) and Arthroplastic Surgeries for Trapeziometacarpal Arthrosis: Functional Outcomes and Patient Satisfaction With a 2-Year Follow-Up.

Purpose: Trapeziometacarpal (TMC) joint prosthesis poses its own challenges for the treatment of TMC arthrosis, especially when compared with the present gold standard, arthroplasty. The aim of this study was to highlight possible outcome differences and patients' satisfaction regarding the treatment of TMC arthrosis. Methods: We evaluated 100 patients with TMC arthrosis treated in two centers and divided into two groups: group A received TMC prosthesis (Touch), whereas group B was treated with arthroplasty, with a 2-year follow-up period. Results: In a comparative analysis, findings revealed group A's superiority in the shortened disabilities of the arm, shoulder and hand questionnaire scores at 1 and 6 months, with significant differences: 34.6% vs 67.1% and 2% vs 9.1%, respectively (P < .0001). Although group A also showed lower the shortened disabilities of the arm, shoulder and hand questionnaire scores at 3 months, this was not statistically significant. Notably, at 1 and 2 years, group A demonstrated better scores without statistical significance. The Kapandji score differed significantly at 6 months: 9.8 vs 9.1 (P = .029). Although the visual analog scale showed generally lower values for the prosthesis group, no statistical differences emerged. Additionally, the M1/M2 ratio became significant postoperatively, favoring group A (P < .05). Conclusions: Trapeziometacarpal prosthesis shows promise for TMC arthrosis, enhancing function, thumb length, and patient recovery, warranting further research and x-ray guidance. Type of study/level of evidence: Therapeutic III.

Osseointegrated Metallic Implants for Finger Amputees: A Review of the Literature.

Digital trauma amputations and digital agenesis strongly affect the functionality and aesthetic appearance of the hand. Autologous reconstruction is the gold standard of treatment. Unfortunately, microsurgical options and transplantation procedures are not possible for patients who present contraindications or refuse to undergo transplantation from the toe (e.g. toe-to-thumb transplantation). To address these issues, osseointegrated finger prostheses are a promising alternative. The functional assessments registered during follow-up confirmed the promising outcomes of osseointegrated prostheses in the treatment of hand finger amputees. This review outlines (a) a detailed analysis of osseointegrated finger metallic components of the implants, (b) the surgical procedures suggested in the literature, and (c) the functional assessments and promising outcomes that demonstrate the potential of these medical osseointegrated devices in the treatment of finger amputees.

Distal radius fractures with diaphyseal involvement: fixation with fixed angle volar plate.

BACKGROUND: The purpose of this study was to evaluate the outcome of fractures of the distal radius with metaphyseal and diaphyseal involvement treated with fixed angle volar plates. MATERIALS AND METHODS: Twenty-one patients with fracture of the radius involving the diaphyseal, metaphyseal and epiphyseal parts were treated with fixed angle plate fixation through an extended volar Henry's approach. Circle wire loops, screws and intrafocal wire fixations were associated in 12 cases. Coexisting ulnar fractures were fixed with plates or K-wires in 8 cases. All patients were prospectively followed using radiographs, physical examination, and DASH (Disabilities of the Arm, Shoulder and Hand) scores. RESULTS: All fractures except one, which needed a secondary bone graft to achieve consolidation, united by an average of 90 days. One case developed a radioulnar synostosis. Radiographs showed optimal reduction in 17 of 21 cases, with restoration of radial length in all cases and a neutral average ulnar variance. Nonanatomical reduction was associated with the worst results (P = 0.0006). Flexion and extension averaged 62.8° and 73.8°, and pronation and supination 85.2° and 80.2°, respectively. The average DASH scores were 30 points at 3 months, 14 points at 6 months, and 6.7 points at the time of final follow-up (at an average of 11 months). According to the Mayo wrist rating system, 14 patients showed excellent results, 5 showed good results, and 2 showed fair results. CONCLUSION: Fixed angle volar plates were demonstrated to be a safe and efficient treatment in these challenging fractures.

Trapeziectomy and suspension arthroplasty with the flexor carpi radialis tendon for treatment of trapeziometacarpal osteoarthritis.

Excision of the trapezium is the common step in most arthroplasties for treating trapeziometacarpal arthritis. Trapeziectomy can be supplemented by several techniques intended to stabilize the first metacarpal but none of these has been proven superior. The aim of this study was to verify if a simplified suspension arthroplasty with the flexor carpi radialis (FCR) tendon, requiring only a single short surgical incision, no intraosseous tunnels and no interposition of prosthetic material, yields equal clinical outcomes to more complex techniques and if the clinical outcomes remain stable over the long term. A cohort of 299 patients was reviewed retrospectively at a follow-up ranging from 3 to 12 years (mean follow-up time 6 years) following total trapeziectomy and suspension arthroplasty using a half-tendon strip of FCR. At this long-term follow-up, the mean DASH score improved from 52 preoperatively to 20 postoperatively. Pain at follow-up was subjectively rated by patients as absent or improved in 92% cases. Thumb opposition assessed on the Kapandji scale was rated 9 or 10 in 144 (76%) hands, 7 or 8 in 30 (16%) hands and <7 in 15 hands (8%). Mean palmar flexion and radial abduction were 45° and 42°, respectively. Mean key pinch and grip strength were 4.7 Kg and 23.5 kg, respectively. When treating trapeziometacarpal osteoarthritis, surgical techniques that do not require complex procedures, bone tunnels, K wire stabilization or interposition of prosthetic materials can be considered and maybe preferred. Our technique of trapeziectomy and suspension arthroplasty with the FCR tendon produces good long-term results.

Dorsal nail plate fixation of distal radius fractures.

Intramedullary fixation of distal radius fractures is an emerging concept. The Dorsal Nail Plate is a new device that links a specifically designed stem to a small distal plate; bone fixation is supported by fixed-angle screws. The device is inserted dorsally using a minimally invasive technique ; its indications are unstable dorsally displaced extra-articular or simple articular distal radius fractures. To evaluate the results obtained with this implant, we retrospectively studied 47 extra-articular (36 cases) or simple articular (11 cases) dorsally displaced distal radius fractures in 46 patients treated with this technique. Patients had a mean follow-up of 11 months and were evaluated radiographically and clinically using the Mayo Wrist Score and the DASH score systems. The minimally invasive operative technique is described. Complications occurred in three cases. Two were observed intra-operatively--partial rupture of extensor pollicis longus tendon--and one postoperatively--loosening of one epiphyseal screw. Excellent reduction was obtained at operation in all but two patients; loss of initial reduction was observed in 2 fractures. All fractures were considered healed radiologically at 40 days. Average final DASH score was 6 (0-20). According to the Mayo Wrist score, 29 patients had excellent, 12 good and 5 satisfactory results. The Dorsal Nail Plate (DNP) has shown to effectively stabilize distal radius fractures with dorsal displacement, leading to an early satisfactory functional recovery. Accurate surgical technique minimizes soft tissue dissection and reduces the risk of complications.

Complications of volar plating of distal radius fractures.

Open reduction and internal fixation has been shown to be effective in the treatment of unstable distal radius fractures. When a dorsal approach is used, extensor tendons rupture or irritation are frequent and well known complications. Complications associated with volar plate fixation have not been studied to the same extent. In this study a homogenous series of 90 patients treated by volar plate fixation were retrospectively evaluated, focusing on the complications observed. The overall rate of complications was 8% (7 cases). Tendon rupture or irritation of extensor (3 cases) and flexor tendons (2 cases) were the complications most frequently seen. All but one were clearly related to direct attritional damage of the tendon caused by the prominent edge of the plate or by protruding screw tips. Loss of reduction requiring repeat internal fixation was observed in one marginal shear fracture involving the lunate facet fragment. One patient had a carpal tunnel release owing to median nerve irritation. In this study, volar plate fixation appeared as a safe procedure in the management of unstable distal radius fractures, with a low rate of complications. Accurate placement of the plate and exact measurement of the screws may further minimize the incidence of complications. When radiographs reveal conditions that may predispose to tendon attritional lesions (prominent edge of the plate, dorsal protrusion of the screw tips) we strongly recommend early removal of the fixation device.