Scaphoid Nonunion Advanced Collapse Wrist Research Articles

Scapholunate Advanced Collapse (SLAC) and Scaphoid Nonunion Advanced Collapse (SNAC): A Review of Treatment Options for Stage II.

Scapholunate advanced collapse (SLAC) and scaphoid nonunion advanced collapse (SNAC) represent clinical entities identified by a pattern of predictable degenerative changes. They are the most common causes of wrist arthritis. Both entities can remain asymptomatic for many years and may go undiagnosed. Diagnosis is usually confirmed through clinical examination, which reveals progressive wrist pain and instability. Radiographically, degenerative changes in the radiocarpal and midcarpal joints are present, as well as nonunion of the scaphoid fracture in SNAC. The management differs according to the stage. Particularly in this review article, we reviewed the treatment options for stage II SLAC and SNAC wrist. In addition to the well-described surgical techniques such as proximal row carpectomy and four-corner fusion, alternatives such as capitolunate arthrodesis, three-corner fusion, and soft tissue procedures like capsulodesis and tenodesis are available. Proximal row carpectomy and partial arthrodeses yield comparable results. Soft tissue procedures are viable alternatives and are preferred in younger patients to avoid early salvage operations.

Proximal Row Carpectomy with and without Capitate Resurfacing: A Preliminary Systematic Review and Meta-Analysis.

In wrist salvage, proximal row carpectomy (PRC) has increasingly shown superior outcomes to four-corner fusion (4CF). Furthermore, PRC with resurfacing capitate pyrocarbon implants (PRC + RCPIs) provides a treatment option that may allow patients to avoid 4CF or wrist arthrodesis and help restore natural joint function and distribute loads evenly across the implant, though RCPI has yet to be evaluated on a large scale. We aimed to compare outcomes between PRC and PRC + RCPI for the treatment of scapholunate advanced collapse (SLAC) and scaphoid nonunion advanced collapse (SNAC) wrists. A systematic review and meta-analysis was performed per Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. PubMed/MEDLINE, Embase, Web of Science, and Cochrane were queried for articles on PRC and PRC + RCPI performed for SLAC and SNAC wrist with minimum 12-month follow-up. Primary outcomes included wrist range of motion (ROM), grip strength, and outcome scores including Disabilities of Arm, Shoulder, and Hand (DASH) and QuickDASH scores, Patient-Rated Wrist and Hand Evaluation (PRWHE), and visual analog scale pain scores. Twenty-two studies reporting on 1,804 wrists were included (1,718 PRC alone, 86 PRC + RCPI). PRC + RCPI was associated with greater postoperative radial deviation, but poorer flexion. PRC + RCPI also had significantly lower postoperative QuickDASH (less disability and symptoms) and postoperative PRWHE (lower pain and disability) scores and an improvement in PRWHE compared with PRC. There was no significant difference in grip strength. PRC + RCPI demonstrated similar postoperative ROM to PRC alone. While PRC + RCPI was associated with more favorable outcome scores, further research is needed to confirm these findings and assess the incidence and profile of complications related to RCPIs. Level IV. See Instructions for Authors for a complete description of levels of evidence.

Four-Corner Fusion Versus Proximal Row Carpectomy for Scapholunate Advanced Collapse and Scaphoid Nonunion Advanced Collapse Wrist: A Systematic Review and Meta-Analysis

Although proximal row carpectomy (PRC) has increasingly been shown to have superior features to four-corner fusion (4CF), individual surgeons may remain convinced of the superiority of one procedure based on personal experience and individual biases. Hence, we sought to perform an updated meta-analysis with some of the largest studies to date to compare outcomes and complications between these procedures in the treatment of scapholunate advanced collapse and scaphoid nonunion advanced collapse wrists. A systematic review and meta-analysis was performed per Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. PubMed/MEDLINE, Embase, Web of Science, and Cochrane were queried for articles on PRC and 4CF performed for scapholunate advanced collapse and scaphoid nonunion advanced collapse wrist. Primary outcomes included wrist range of motion; grip strength; outcome measures, including Disabilities of Arm, Shoulder, and Hand and Quick Disabilities of Arm, Shoulder, and Hand scores, Patient-Rated Wrist and Hand Evaluation, and visual analog scale pain scores; and surgical complications. Sixty-one studies reported on 3,174 wrists, of which 54% were treated with PRC and 46% were treated with 4CF. The weighted mean follow-up was 61 months (range, 12-216 months). Meta-analysis comparing PRC and 4CF demonstrated that PRC had significantly greater postoperative extension; ulnar deviation; postoperative improvement in extension, flexion, ulnar deviation; and visual analog scale score. No comparisons showed significant differences in grip strength. The percentage of wrists requiring arthrodesis was 5.2% for PRC and 11% for 4CF. There was an 8.9% (57/640 wrists) 4CF nonunion rate and 2.2% (17/789) hardware removal rate after 4CF. In the treatment of scapholunate advanced collapse and scaphoid nonunion advanced collapse wrists, PRC results in better outcomes and a lower complication rate compared to 4CF. Therapeutic IV.

Quantitative 3-D CT Demonstrates Distal Row Pronation and Translation and Radiolunate Arthritis in the SNAC Wrist.

In scaphoid nonunion advanced collapse (SNAC) wrist arthritis, we analyzed the 3-dimensional (3-D) deformity patterns of carpal alignment secondary to scaphoid nonunion and quantified subchondral arthritis by investigating alterations in bone density. We constructed 3-D models of the carpal bones and radius from 51 patients with scaphoid nonunion (nonunion group) and 50 healthy controls (control group). We quantified the differences in 3-D geometric position of the distal carpal row relative to the distal radius in SNAC wrists versus controls. In addition, we assessed the bone density of anatomic regions of interest in the radiocarpal and capitolunate joints relative to the pisiform bone density to characterize degenerative changes in SNAC wrists. The distal carpal row pronated by a difference of 14° (7.2° versus -6.7°; p < 0.001), deviated ulnarly by a difference of 19° (7.7° versus -11.2°; p < 0.001), shifted dorsally by a difference of 17% of the dorsovolar width of the distal radius (21.0% versus 4.4%; p < 0.001), shifted radially by a difference of 8% of the radioulnar width of the distal radius (13.2% versus 5.3%; p < 0.001), and migrated proximally by a difference of 12% of the lunate height (96.3% versus 108.8%; p < 0.001) in the nonunion group compared with the control group. Additionally, it was found that bone density was greater at the capitolunate joint (capitate head: 140.4% versus 123.7%; p < 0.001; distal lunate: 159.9% versus 146.3%; p < 0.001), the radial styloid (157.0% versus 136.3%; p < 0.001), and the radiolunate joint (proximal lunate: 134.8% versus 122.7%; p < 0.001; lunate fossa: 158.6% versus 148.1%; p = 0.005) in the nonunion group compared with the control group. Scaphoid nonunion exhibited a unique deformity pattern and alteration in bone-density distributions. The distal carpal row not only shifted dorsally and migrated proximally but also pronated, deviated ulnarly, and shifted radially. Bone density was greater at the capitolunate joint, the radial styloid, and surprisingly, the radiolunate joint. Our findings give insight into the natural history and progression of arthritis of the SNAC wrist. Additionally, future studies may give insight into whether successful treatment of scaphoid nonunion arrests the progression of arthritis. Prognostic Level III . See Instructions for Authors for a complete description of levels of evidence.

Two-, Three-, or Four-Corner Arthrodesis for Midcarpal Osteoarthritis: A Systematic Review and Meta-Analysis

Several limited midcarpal arthrodeses have been used in the treatment of midcarpal osteoarthritis as part of scapholunate advanced collapse and scaphoid nonunion advanced collapse. There is no consensus on whether two-carpal arthrodesis (2CA), three-carpal arthrodesis (3CA), bicolumnar arthrodesis, or four-carpal arthrodesis (FCA) results in the best outcomes. The objective of this study was to determine whether there is a difference in outcomes in patients undergoing FCA, 3CA, 2CA, or bicolumnar arthrodesis for midcarpal osteoarthritis. A systematic review and meta-analysis were performed in multiple databases following Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Studies reporting the four surgical techniques were included. The primary outcomes were postoperative visual analog scale pain score, the Disabilities of the Arm, Shoulder, and Hand score, and the Mayo Wrist Score. The secondary outcomes were active range of motion, grip strength, and reported complications. Of 2,270 eligible studies, 80 articles were selected, including a total of 2,166 wrists. The visual analog scale pain scores for both the 2CA and FCA groups reached an adequate pain reduction based on the Patient Acceptable Symptom Scale. The Disabilities of the Arm, Shoulder, and Hand score was also comparable between these two groups. The 2CA group also showed a significantly better active range of motion than the FCA group for both flexion-extension and radioulnar deviation arc. The incidence of nonunion was 6.9% in the FCA group compared with 10.0% in the 2CA group. Although the 2CA procedure has a theoretical advantage over the FCA method, the analysis of data showed that generally, these techniques have similar outcomes and complications. Therefore, both (2CA and FCA) are good options for midcarpal osteoarthritis in scapholunate advanced collapse and scaphoid nonunion advanced collapse wrists. Therapeutic IV.

Decreased Complication Rate Using Partially Threaded Compared With Fully Threaded Compression Screws in 4 Corner Arthrodesis: A Retrospective Study.

Scapho-lunate advanced collapse (SLAC) and scaphoid nonunion advanced collapse (SNAC) of the wrist are the most common types of wrist arthritis. We compared the union rate and complication profile of patients with SLAC and SNAC wrist undergoing 4 corner arthrodesis with partially threaded or fully threaded headless compression screws. A single-center retrospective review was conducted to identify all patients treated for SLAC and SNAC with 4 corner fusion using headless compression screws from 2016 to 2021. A total of 33 patients undergoing surgery on 35 wrists were identified and included in the study. Demographics, comorbidities, complication profile, and radiographs were collected and compared between groups. One hundred percent (16/16) of partially threaded and 84.2% (16/19) of fully threaded screws demonstrated union by minimum 10-week follow-up. The total complication rate (avascular necrosis of lunate, screw loosening, etc.) was 31.4%; 52.6% of wrists implanted with fully threaded screws experienced complications compared with a 6.3% complication rate with partially threaded screws. The difference was statistically significant between the 2 groups (P = .004). Four corner arthrodesis using antegrade compression screws is an effective, reproducible method to achieve fusion in the wrist. The use of fully threaded screws was associated with more complications than with partially threaded screws, although union rate was not significantly different. Future studies with larger sample sizes would be useful to fully elucidate differences between these 2 constructs.

Single- and Bicolumn Limited Intercarpal Fusion: A Solution for the SLAC or SNAC Wrist.

Background Single- or bicolumn limited intercarpal fusion, also called one- or two-column fusion, has been introduced as an alternative to four-corner fusion. The rationale behind this is obtaining less need for bone grafting and consequently improving the chances of the union. Method From August 2014 to October 2020, 45 consecutive patients (15 women), with a mean age of 58.4 years (range: 35-79), have been treated for scapholunate advanced collapse or scaphoid nonunion advanced collapse wrist. In 33 cases, the surgery was performed as two-column fusion, and in 12 cases as one-column fusion. The union was determined by a computed tomography (CT) scan or X-ray follow-up studies. The pain assessments (visual analog score: 0-100), range of motion (ROM), grip strength, and Quick Disabilities of the Arm, Shoulder, and Hand score were prospectively included. Results Of 45 patients, 43 were available for the follow-up, at a mean of 35 months (range: 12-68). All patients but two achieved union at a mean of 9.5 weeks (range: 5-25 weeks). Pain diminished from 60.3 (mean) preoperatively to 16.7 (mean) postoperatively ( p = 0.0001). Grip strength slightly increased from 28.2 KgF (mean) to 29 KgF (mean) (not significantly, p = 0.86). Quick Disability of the Arm, Shoulder, and Hand score improved from 39.5 (median) before the surgery to 11 (median) after the surgery ( p = 0.0004). The postoperative ROM of 62/37 degrees (mean) were recorded for total dorsovolar/radioulnar flexions, respectively. Three patients were converted to total wrist fusion and one to total wrist arthroplasty. One had a rearthrodesis to two-column fusion, which united. Conclusion One- and two-column fusion showed significant improvement in pain and function, with minimal impairment of the grip strength on the short- to mid-term follow-up. A union rate of 95% and an acceptable complication rate were achieved, without fusing all carpals. Level of Evidence Prospective, cohort study, level III.

Routinely-Collected Outcomes of Proximal Row Carpectomy

To describe patient-reported pain and function 12 months after proximal row carpectomy (PRC). Secondary outcomes included return to work, grip strength, range of wrist motion, satisfaction with treatment results, and complications. This cohort study was part of the British Society for Surgery of the Hand Studyathon 2021, using ongoing routinely-collected data of 304 eligible patients who underwent PRC (73% scapholunate advanced collapse, 11% scaphoid nonunion advanced collapse wrist; 11% Kienböck, 5% other indications) from Xpert Clinics, the Netherlands between 2012-2020. The primary outcome was the Patient Rated Wrist/Hand Evaluation total score (range, 0-100, lower scores indicate better performance). Of the 304 patients, the primary outcome was available in 217 patients. The total Patient Rated Wrist/Hand Evaluation score improved from 60 (95% confidence interval [CI], 57-63) to 38 (95% CI, 35-41) at 3 months, and 26 (95% CI, 23-29) at 12 months. The pain and function subscales improved by 18 (95% CI, 17-20) and 16 (95% CI, 14-18) points, respectively. At 12 months, 82% had returned to work at a median time of 12 (95% CI, 9-14) weeks following PRC. Grip strength did not improve. Wrist flexion and extension demonstrated a clinically irrelevant decrease. Satisfaction with treatment result was excellent in 27% of patients, good in 42%, fair in 20%, moderate in 6%, and poor in 5%. Complications occurred in 11% of patients, and conversion to wrist arthroplasty occurred in 2 patients. A clinically relevant improvement in patient-reported pain and function was observed at 3 months after PRC, with continued improvement to 12 months. These data can be used for shared-decision making and expectation management. Therapeutic IV.

Lateral Approach for Scaphoid Excision and Capitolunate Arthrodesis in the Treatment of Scapholunate Advanced Collapse and Scaphoid Nonunion Advanced Collapse Wrists: A Case Series.

The dorsal approach is commonly used in open wrist arthrodesis. However, the extensor compartments and the dorsal wrist capsule need to be opened. We propose and evaluate a lateral approach using a small incision over the scaphoid anatomical snuffbox, which could be more straightforward for performing scaphoid excision and capitolunate arthrodesis in the treatment of scapholunate advanced collapse (SLAC) and scaphoid nonunion advanced collapse (SNAC). Between 2016 and 2021, 10 patients were enrolled retrospectively and underwent the lateral approach for scaphoid excision and capitolunate arthrodesis. We presented the radiographic outcomes, including fusion status, capitolunate angle, and carpal height ratio. The functional outcomes of wrist range of motion, grip strength, visual analog scale (VAS) score for pain, Quick Disabilities of the Arm, Shoulder, and Hand (QuickDASH) score, and Mayo wrist score were evaluated. The data obtained were analyzed and presented as the mean and standard deviation (SD). All 10 patients achieved solid bone fusion, and the mean follow-up period was 20.4 (range 12-38; SD 10.1) months. Postoperatively, the mean capitolunate angle and carpal height ratio improved from 18.1° (range 8-34°; SD 8.6°) to 2.9° (range 0-5°; SD 1.9°) and 0.45 (range 0.40-0.49; SD 0.03)% to 0.50 (range 0.46-0.54; SD 0.02)%, respectively. The average preoperative and final follow-up functional results were as follows: flexion-extension arc of 76.5° (range 50-110°; SD 20.0°) and 74.0° (range 65-90°; SD 9.1°); VAS pain score of 5.8 (range 4-7; SD 1.0) and 0.9 (range 0-2; SD 0.6); QuickDASH score of 55.9 (range 40.9-79.5; SD 11.4) and 26.1 (range 18.2-36.4; SD 6.0); and Mayo wrist score of 46.5 (range 25-60; SD 13.8) and 72.5 (range 70-80; SD 3.5), respectively. The lateral approach for scaphoid excision and capitolunate arthrodesis in treating SLAC and SNAC can provide a straightforward way for performance. This approach does not require disruption of the dorsal wrist capsule and extensor retinaculum. Bony healing can be achieved, and functional outcomes can be improved.

Use of Wrist Denervation in the Treatment of SLAC and SNAC Wrist by ASSH Members.

Background Scapholunate advanced collapse (SLAC) and scaphoid nonunion advanced collapse (SNAC) are common patterns of wrist arthritis, and surgical treatment options include partial and total wrist arthrodesis and wrist denervation, which maintains the current anatomy while relieving pain. Introduction The purpose of this study is to elucidate current practices within the hand surgery community with respect to the use of anterior interosseous nerve/posterior interosseous nerve (AIN/PIN) denervation in the treatment of SLAC and SNAC wrists. Methods An anonymous survey was distributed to 3,915 orthopaedic surgeons via the American Society for Surgery of the Hand (ASSH) listserv. The survey collected information on conservative and operative management, indications, complications, diagnostic block, and coding of wrist denervation. Results In total, 298 answered the survey. 46.3% ( N = 138) of the respondents used denervation of AIN/PIN for every SNAC stage, and 47.7% ( N = 142) of the respondents used denervation of AIN/PIN for every SLAC wrist stage. AIN and PIN combined denervation was the most common standalone procedure ( N = 185, 62.1%). Surgeons were more likely to offer the procedure ( N = 133, 55.4%) if motion preservation had to be maximized ( N = 154, 64.4%). The majority of surgeons did not consider loss of proprioception ( N = 224, 84.2%) or diminished protective reflex ( N = 246, 92.1%) to be significant complications. 33.5%, 90 respondents reported never performing a diagnostic block prior to denervation. Conclusion Both SLAC and SNAC patterns of wrist arthritis can result in debilitating wrist pain. There is a wide range of treatment for different stages of disease. Further investigation is required to identify ideal candidates and evaluate long-term outcomes.

Relationship Between Preoperative and Postoperative Motion After Four-Corner Wrist Fusion for Osteoarthritis: Clustering and Regression Analyses

Four-corner fusion (4CF) is a surgical option for refractory scapholunate advanced collapse and scaphoid nonunion advanced collapse wrist arthritis. Preoperative range of motion (ROM) predicts outcomes in many orthopedic procedures. This study investigates ROM in a cohort of 4CF patients to examine the relationship between preoperative and postoperative motion and identifies different clinical patterns. We performed a retrospective review of 4CF patients. Patients with a history of inflammatory arthritis and radiographic characteristics of inflammation were excluded. Demographics, prior wrist surgery history, and ROM data were collected at preoperative and postoperative intervals after cast removal at 8 weeks, 3 months, and 8 months. Regression analysis compared the motion before and after 4CF. Subsequent cluster analysis to reduce confounding compared postoperative motion differences in the top 20% to the bottom 20% of patients by preoperative motion. We included 148 patients; 27 had prior surgery on the ipsilateral wrist. Preoperative arc averaged 86° ± 28° (flexion 46° ± 17°, extension 40° ± 15°); 8-week arc 43° ± 19° (flexion 19° ± 12°, extension 24° ± 12°); 3-month arc 62° ± 17° (flexion 30° ± 12°, extension 32° ± 11°); and 8-month arc 74° ± 17° (flexion 36° ± 11°, extension 37° ± 12°). Preoperative and final arcs were (r= 0.39). Clustering by the preoperative arc, the top 20% (mean 124° ± 15°) achieved a mean final arc of 81° ± 16°, while the bottom 20% (mean 47° ± 16°) achieved a mean final arc of 65° ± 19°. Intercluster differences were statistically significant. The bottom 20% gained motion postoperatively. Most patients in the middle 60% did not differ significantly in postoperative motion. Although wrist motion following 4CF correlates positively with preoperative motion, most patients do not differ significantly in postoperative motion. Patients with substantial preoperative motion deficits gain motion after 4CF. This information is important when counseling patients, determining the timing of surgical intervention, and managing expectations related to motion outcomes. Prognostic II.

Outcomes of Arthroscopic Scaphoid Excision and Lunocapitate Fusion for Advanced Traumatic Arthritis of the Wrist.

Arthroscopic lunocapitate (LC) fusion can be an alternative surgical treatment for scapholunate advanced collapse (SLAC) or scaphoid nonunion advanced collapse (SNAC) of the wrist. We retrospectively reviewed patients who had arthroscopic LC fusion to estimate clinical and radiological outcomes. From January 2013 to February 2017, all patients with SLAC (stage II or III) or SNAC (stage II or III) wrists, who underwent arthroscopic LC fusion with scaphoidectomy and were followed up for a minimum of 2 years, were enrolled in this retrospective study. Clinical outcomes included visual analog scale (VAS) pain, grip strength, active range of wrist motion, Mayo wrist score (MWS), and the Disabilities of Arm, Shoulder and Hand (DASH) score. Radiologic outcomes included bony union, carpal height ratio, joint space height ratio, and loosening of screws. We also performed group analysis between patients with 1 and 2 headless compression screws to fix the LC interval. Eleven patients were assessed for 32.6 ± 8.0 months. Union was achieved in 10 patients (union rate, 90.9%). There was improvmenet in mean VAS pain score (from 7.9 ± 1.0 to 1.6 ± 0.7, p = 0.003) and grip strength (from 67.5% ± 11.4% to 81.8% ± 8.0%, p = 0.003) postoperatively. The mean MWS and DASH score were 40.9 ± 13.8 and 38.3 ± 8.2, respectively, preoperatively and improved to 75.5 ± 8.2 and 11.3 ± 4.1, respectively, postoperatively (p < 0.001 for all). Radiolucent screw loosening occurred in 3 patients (27.3%), including 1 nonunion patient and 1 patient who underwent screw removal due to the screw migration encroaching the lunate fossa of radius. In group analysis, only the frequency of radiolucent loosening was higher in 1 screw (3 of 4) than 2 screw fixation (0 of 7) (p = 0.024). Arthroscopic scaphoid excision and LC fusion for patients with advanced SLAC or SNAC of the wrist was effective and safe only in cases fixed with 2 headless compression screws. We recommend arthroscopic LC fusion using 2 screws rather than 1 to decrease radiolucent loosening, which might affect complications such as nonunion, delayed union, or screw migration.

Inter-Rater Reliability of Magnetic Resonance Imaging in Comparison to Computed Tomography and Wrist Arthroscopy in SLAC and SNAC Wrist.

The aim of the study was to assess the inter-rater reliability of magnetic resonance imaging (MRI) in comparison to computed tomography (CT) and wrist arthroscopy in patients with scapholunate (SLAC) or scaphoid non-union advanced collapse (SNAC) as well as to evaluate a grading score of cartilage lesions. A total of 42 patients (36 male, 6 female) at a mean age of 45 years (range: 19–65 years) with a SLAC or SNAC wrist who had a preoperative MRI and CT scan as well as underwent arthroscopy of the wrist between 2013 and 2018 were included in this study. Cartilage lesions, as assessed by MRI, CT and wrist arthroscopy, were classified by two hand surgeons in three stages. Inter-rater reliability was evaluated using the Kendall Tau-b test as well as the chi-square test to analyze for trend. The correlation between cartilage lesions, classified by arthroscopy and MRI, was low. A moderate correlation between CT and arthroscopy staging was shown. The highest inter-rater correlation was found between MRI and CT staging. An additionally performed logistic regression showed that progression of cartilage lesions as shown in MRI scans correlates with a restriction of range of motion (ROM). The level of cartilage lesion may be more severely classified in an MRI than during arthroscopy. Arthroscopy remains the gold standard in detecting cartilage lesions and thus in the decision-making process of the definitive treatment in carpal collapse.

Spontaneous index finger extensor tendon rupture in a SNAC wrist

We present two recent cases of spontaneous rupture of both index finger extensor digitorum communis and extensor indices proprius tendons caused by a dorsal carpus osteophyte. Both patients had a history of scaphoid fracture non-union with evolution to scaphoid non-union advanced collapse (SNAC) of the wrist. These two cases were treated surgically with a 3-corner arthrodesis, and an interposition of a fragment of one of both ruptured tendons together with a tendon transfer of a supernumerary extensor digitorum communis of the third finger. The interposed tendon fragment was sutured with a Pulvertaft weave proximally and end-to-end distally. The supernumerary tendon was added as reinforcement to this construction. At 6-month and 14-month follow-up, the patients had a slight decrease in range of motion and functionality without hindering the activities of daily living and a great improvement in strength. Isolated extension of the index finger was possible minimum 6 months postoperatively. Spontaneous tendon ruptures of the finger extensors are not common but were described earlier in literature. Recent literature described that underlying cause of a spontaneous tendon rupture should always be corrected in order to prevent or at least delay future ruptures. To our knowledge, this is a rare type of complication and this kind of treatment has never been reported in literature.

Retrospective Comparison of Capitolunate Arthrodesis Using Headless Compression Screws Versus Nitinol Memory Staples for SLAC and SNAC Wrist: Radiographic, Functional, and Patient-Reported Outcomes.

Nitinol memory compression staples have been proposed as an effective alternative to compression screws for capitolunate arthrodesis (CLA) for scaphoid nonunion advanced collapse (SNAC) and scapholunate advanced collapse (SLAC) wrist. The purpose of this study was to compare the clinical outcomes of CLA for SNAC or SLAC wrist treatment using either compression screws or nitinol staples. In all, 47 patients with CLA for SLAC or SNAC wrist with screws or nitinol staples were retrospectively identified. Primary outcome was fusion on radiographs and/or computed tomography. Secondary outcomes were hardware-related complications (HWCs) and other complications, range of motion, grip strength, and patient-reported outcome measures (PROMs), including Visual Analogue Pain scale; Disabilities of the Arm, Shoulder, and Hand score; and patient-rated wrist evaluation. Of the 47 eligible patients, 40 (85%) were included: 31 patients in the staple group and 9 patients in the screw group. The average age was 49 (17-80) years. There was an 89% union rate for the screw group and a 97% union rate for the staple group. Two patients had screw backout: one who went onto union after screw removal and the other who went onto nonunion after hardware removal. There were 2 (6.5%) HWCs in the staple group. One patient had staple loosening requiring revision and the other dorsal impingement requiring staple removal after radiographic union. In all subsequent cases, the staples were countersunk with no impingement. No significant differences existed between any additional outcomes. We found no differences between nitinol staples and screws for CLA regarding HWCs or PROMs. Nitinol staples may offer additional benefits as a safe and effective alternative to compression screws for wrist fusions.

Four-corner fusion method using a bioabsorbable plate for scapholunate advanced collapse and scaphoid nonunion advanced collapse wrists: a case series study

BackgroundScaphoid excision and four-corner arthrodesis is an acceptable salvage procedure for the treatment of scapholunate advanced collapse (SLAC) and scaphoid nonunion advanced collapse (SNAC) wrists, since first popularized in the 1980s. We investigated the potential application of novel bioabsorbable plates and screws made of un-sintered hydroxyapatite/poly-L-lactide composite for the treatment of metacarpal fractures. We used this material for the fixation of four-corner fusions for SLAC or SNAC wrists commencing from April 2009. The purpose of this study was to clarify the controversy in the literature regarding the use of these plates.MethodsThe surgical procedures and clinical outcomes of four-corner fusions using a bioabsorbable (poly-L-lactic acid and hydroxyapatite) plate were reported. Ten patients (mean age, 59.2 years) with SLAC or SNAC wrists underwent fusions between April 2009 and June 2016. The primary diseases were scapholunate ligament injury, Preiser disease, and scaphoid pseudarthrosis. The mean postoperative follow-up period was 45.9 months (range, 12–86).ResultsIn all patients, bone union was achieved without dislocation or pain. The mean wrist flexion and extension arc improved from 78.5 degrees before surgery to 90.5 degrees after surgery. Mean grip strength improved from 51 to 69% after surgery, and the Quick Disabilities of the Arm, Shoulder, and Hand (QuickDASH) score improved from 53.5 to 14.3. No complications such as infection, avascular swelling, or tendon adhesion were observed. This implant requires no removal of internal fixation devices, produces stable outcomes, and is an effective fusion technique.ConclusionsWe summarized the outcomes of four-corner arthrodesis using bioabsorbable plates. Satisfactory clinical results were shown, with no obvious complications. This novel plate also serves as a good alternative for patients who are allergic to metals. Furthermore, bioabsorbable plates are advantageous as they do not require removal.

A Reliability Study of Multiplanar Radiographs for the Evaluation of SNAC Wrist Arthritis.

Background: Scaphoid nonunion advanced collapse (SNAC) is a common form of wrist arthritis, the treatment of which depends on the arthritic stage. The Vender classification serves to describe SNAC arthritis based on a single posteroanterior (PA) radiograph. The purpose of this study was to evaluate the intraobserver and interobserver agreement of the Vender classification, comparing multi versus single radiographic views. Methods: A retrospective review of patients with SNAC arthritis who underwent a proximal row carpectomy or a 4-corner fusion was performed. The included patients had 3 radiographic views of the pathologic wrist. Fifteen patients were analyzed by 5 blinded reviewers. Wrists were graded using the Vender classification first on the PA view and then using multiview radiographs. The intraobserver and interobserver agreement was determined using weighted kappa analysis. χ2 tests were calculated comparing the evaluation between single- versus multiview radiographs and determining a higher Vender stage. Results: Multiview radiographs demonstrated a higher intraobserver κw compared with single-view radiographs (0.72 vs 0.66), both representing substantial agreement. The average interobserver agreement was moderate (κw of 0.48) for single view and slight (κw of 0.30) for multiview evaluation. Evaluating multiview radiographs was 6.37 times more likely to demonstrate Vender stage 3 arthritis compared with single view (odds ratio = 6.37 [confidence interval, 3.81-10.64], P < .0001). Conclusion: Reviewing multiview radiographs more commonly yielded Vender stage 3 osteoarthritis classification. The decreased interrater reliability in the multiview analysis is likely related to the increased number of articular surfaces evaluated. Using a single PA view may underestimate the severity of arthritis present.

Scaphoid excision with lunatocapitate fusion for the treatment of scaphoid nonunionwith advanced collapsed wrist.

To investigate the union rate after lunatocapitate arthrodesis for the treatment of scaphoid nonunion advanced collapse (SNAC) wrists and to evaluate the clinical results of this technique. We conducted a prospective study between January 2014 and July 2017. Fifteen males with painful stage III SNAC wrists (average age, 32years, range, 20-37years; average follow-up time, 25.2months, range, 20-36months) underwent scaphoid excision and lunatocapitate fusion. Lunatocapitate fusions were fixed with headless Herbert screws with K-wire fixation (retrograde direction). Radiographs, wrist range of motion, and Mayo wrist score were examined. All patients achieved radiographic and clinical union after lunatocapitate fusion during follow-up (average 10months post-operatively). The flexion-extension arc was 70°, and the average Mayo wrist score was 74.3 points (eight with excellent, four with good, three with satisfactory, and one with poor result). Thirteen patients returned to work, whereas two with nonunion required surgical graft revision. Complete union was achieved at an average of 12weeks after graft revision, with improved range of motion, and the patients returned to work with a change in their occupation. Lunatocapitate arthrodesis is a satisfactory therapeutic alternative to four-corner fusion for SNAC wrists.

Capitolunate Arthrodesis: A Systematic Review

To compile and review the indications, outcomes, and complications of capitolunate arthrodesis (CLA). We performed a literature search identifying 33 articles, 6 of which met inclusion criteria, including 80 patients. Included publications contained the results of CLA with minimum 12-month follow-up between 2000 and 2018. Data were pooled and analyzed focusing on the primary outcomes of union and complications. Average age of patients was 48 years (range, 22-86 years), median follow-up was 34 months (range, 12-198 months), and most common indication was scaphoid nonunion advanced collapse (59%). Nearly half underwent a concomitant triquetrum excision (49%). Most patients were pain-free (78%) and returned to work (92%). Grip strength and visual analog pain scale both improved after CLA. Whereas 96% fused within a reported 42 to 210 days (median, 70 days), 11% of patients had complications including nonunion (3.8%) and loose hardware (6.3%). The reoperation rate was 14%, including wrist arthrodeses and wrist arthroplasty. Capitolunate arthrodesis is a feasible option for scapholunate advanced collapse and scaphoid nonunion advanced collapse wrists with complications similar to those encountered in 4-corner arthrodesis. Therapeutic IV.

Clinical and radiological outcomes of 40 cases of SLAC and SNAC wrist treated by four-corner arthrodesis with locking plate

The treatment of scapholunate advanced collapse (SLAC) and scaphoid nonunion advanced collapse (SNAC) wrist varies. No clear consensus exists on surgical indications. Scaphoid excision and four-corner arthrodesis with locking plate is one of preferred treatments for these lesions. The purpose of this study was to assess the clinical and radiological outcomes of locking plates for treating SNAC and SLAC wrist after a mean follow-up of 5 years and to compare these outcomes with the results reported in the literature. A retrospective study was conducted in two hospitals, involving 40 patients who underwent scaphoid excision and four-corner arthrodesis with locking plate between January 2006 and September 2016. All patients were reviewed as outpatients with clinical and radiographic measurements. At the last follow-up, the mean pain level on visual analog scale (VAS) was 2.5/10 [0–7] (SD: 1.7). Patients had a mean flexion of 46% and a mean extension of 46% compared to the contralateral side. An 18% gain was observed in grip strength. The mean postoperative QuickDASH score was 30 [0–57] (SD: 15.3). Seventy percent of patients were satisfied with the operation. Complete (all four joint interfaces) joint space fusion was achieved in 55% of patients. Only one patient (2.5%) had no joint fusion. The joint between the lunate and the capitate was fused in 38 patients (95%). Nine patients suffered complications; eight of them required surgical revision (20%). Four-corner arthrodesis with locking plate is a valuable surgical technique for treating SLAC and SNAC wrist because it preserve satisfactory range of motion and grip strength (64% compared to the non-operated side), maintains the height of the carpus and prevents the premature appearance of radiocarpal osteoarthritis, as long as the technical challenges of this procedure are mastered.