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Computers in Biology and Medicine Jun 2024High-performance polymers are used in different fixed prosthesis treatments due to their many advantages such as biocompatibility, shock absorption ability, high...
BACKGROUND
High-performance polymers are used in different fixed prosthesis treatments due to their many advantages such as biocompatibility, shock absorption ability, high fracture resistance. The effects of marginal design on the forces on high-performance polymers are unknown. This study aimed was to investigate the stress distribution of different marginal designs on Polyetheretherketone (PEEK) and Polyetherketoneketone (PEKK) substructure materials, cortical bone and cancellous bone by finite element analysis.
METHODS
A first maxillary molar tooth was modeled in 3D using the "3D Complex Render" method. Considering the ideal preparation conditions (Taper angle was 6°, step depth was 1 mm, occlusal reduction was 2 mm), four different configurations were modeled by changing the marginal design (chamfer, deep chamfer, shoulder 90°, shoulder 135°). PEEK, PEKK substructure, and composite superstructure were designed on created models. A total of 150 N oblique force from two points and a total of 300 N vertical force from three points were applied from occlusall. and the maximum principal stress, minimum principal stress, von Mises stress findings in the cortical bone, spongiose bone, and substructure were examined. The study was carried out by static linear analysis with a three-dimensional finite element stress analysis method.
RESULTS
The highest maximum principal stress value in the cortical bone was observed when the PEEK + Shoulder 135° step at vertical force. The highest minimum principal stress value in the cortical bone was observed when the PEEK + Shoulder 90° step, and PEEK + deep chamfer step at oblique force. The highest maximum principal stress value in spongiose bone was observed when the PEEK + Shoulder 90° step. The highest minimum principal stress value in spongiose bone was observed when the PEEK + deep chamfer step at vertical force. The highest von Mises stress value in the substructure was observed when the PEKK + Deep chamfer step at oblique force. The lowest maximum principal stress value in the cortical bone was observed when the PEKK + Shoulder 135° step at oblique force. The lowest minimum principal stress value in the cortical bone was observed when the PEEK + Shoulder 135° step, and PEKK + shoulder 135° step at vertical force. The lowest maximum principal stress value in spongiose bone was observed when the PEEK + Shoulder 90° step. The lowest minimum principal stress value in spongiose bone was observed when the PEEK + Shoulder 135° step and PEKK + Shoulder 135° step at vertical force. The lowest von Mises stress value in the substructure was observed when the PEEK + Deep chamfer step at vertical force.
CONCLUSION
When cortical and spongiose bone stress were evaluated, no destructive stress was observed. Considering the stresses occurring in the substructure the highest stress was observed in the chamfer step.
PubMed: 38861895
DOI: 10.1016/j.compbiomed.2024.108708 -
Computers in Biology and Medicine May 2024The bicipital groove is an important anatomical feature of the proximal humerus that needs to be identified during surgical planning for procedures such as shoulder...
The bicipital groove is an important anatomical feature of the proximal humerus that needs to be identified during surgical planning for procedures such as shoulder arthroplasty and proximal humeral fracture reconstruction. Current algorithms for automatic identification prove ineffective in arthritic humeri due to the presence of osteophytes, reducing their usefulness for total shoulder arthroplasty. Our methodology involves the use of a Random Forest Classifier (RFC) to automatically detect the bicipital groove on segmented computed tomography scans of humeri. We evaluated our model on two distinct test datasets: one comprising non-arthritic humeri and another with arthritic humeri characterized by significant osteophytes. Our model detected the bicipital groove with a mean absolute error of less than 1mm on arthritic humeri, demonstrating a significant improvement over the previous gold standard approach. Successful identification of the bicipital groove with a high degree of accuracy even in arthritic humeri was accomplished. This model is open source and included in the python package shoulder.
PubMed: 38861894
DOI: 10.1016/j.compbiomed.2024.108653 -
Journal of Hand and Microsurgery Mar 2024Complex proximal interphalangeal joint (PIPJ) fractures are challenging injuries to treat. There are multiple established treatment methods available for these injuries,...
BACKGROUND
Complex proximal interphalangeal joint (PIPJ) fractures are challenging injuries to treat. There are multiple established treatment methods available for these injuries, including dynamic external fixation. This study reports the outcomes of complex PIPJ fractures treated with a hand-specific external fixation device.
METHODS
Twenty-five fingers in 25 patients were treated with the DigiFix external fixator device for treatment of a PIPJ dorsal fracture dislocation ( = 16) or pilon fracture ( = 9). There were 16 males and 9 females with a mean age of 40 years (range: 14-75 years) at the time of injury. The median time from injury to surgery was 10 days (interquartile range [IQR]: 5; range: 3-49). Chart and radiographic data were reviewed retrospectively.
RESULTS
The average duration of external fixation was 41 days (range: 26-62 days). At a mean follow-up of 28 weeks (range: 12-105 weeks), the mean PIPJ flexion was 82 (range: 30-105 degrees), extension was -10° (range: -30 to 0 degrees), and flexion/extension arc of motion was 72 degrees (range: 30-95 degrees). Final mean Quick Disabilities of the Arm, Shoulder, and Hand (QuickDASH) score was 21.5 (range: 0-65.8). There were zero major complications and six (24%) minor complications, including superficial cellulitis (4) and stiffness (2).
CONCLUSION
Dynamic external fixation for the treatment of complex PIPJ injuries allows for early range of motion and leads to favorable outcomes. This hand-specific external fixator has a reproducible technique which results in predictable and reliable PIPJ distraction.
PubMed: 38854365
DOI: 10.1055/s-0042-1751275 -
Journal of Shoulder and Elbow Surgery Jun 2024Gartland Type III supracondylar humerus fractures are commonly treated using closed reduction followed by percutaneous pin fixation. However, conversion to open...
PURPOSE
Gartland Type III supracondylar humerus fractures are commonly treated using closed reduction followed by percutaneous pin fixation. However, conversion to open reduction may be necessary if closed reduction fails. This study aimed to identify risk factors associated with failed closed reduction and provide a theoretical basis for clinical decision-making in the treatment of Gartland Type III fractures.
METHODS
A retrospective analysis was conducted on children with Gartland Type III supracondylar humerus fracture who underwent surgical treatment between April 2017 and June 2018. Based on whether or not the closed reduction was successful, patients were split into the open reduction group and the closed reduction group. Within the closed reduction group, subgroup analysis based on surgery duration was carried out. Data were collected from medical records and X-ray images. Univariate and multivariate regression analyses were utilized to evaluate the relationship between variables and failed closed reduction.
RESULTS
The study included 36 patients in the open reduction group and 135 patients in the closed reduction group. Multivariate analysis revealed that the presence of angle (P=0.024, OR=3.199), rotation (P=0.000, OR=6.359), skin creases (P=0.013, OR=4.077), anterior-posterior displacement ratio (P=0.011, OR=4.337), fracture angle in the anteroposterior view (P=0.014, OR=0.939), and fracture distal displacement direction (P=0.002, OR=5.384) were independent risk factors for failed closed reduction. Subgroup analysis showed that fracture distal displacement direction (P=0.013), skin folds (P=0.013), lateral displacement ratio (P=0.016), and anterior-posterior displacement value (P=0.005) significantly influenced the duration of closed reduction surgery.
CONCLUSION
The presence of sharp angle or rotation at the fracture ends, skin folds on the anterior elbow, minor anterior-posterior displacement of the fracture, higher medial inclination of the fracture plane, and distal fracture displacement towards the radial side are independent risk factors for failed closed reduction in pediatric Gartland Type III supracondylar humerus fracture.
PubMed: 38852708
DOI: 10.1016/j.jse.2024.04.019 -
Journal of Shoulder and Elbow Surgery Jun 2024Preoperative opioid users (POU) experience worse outcomes and higher complication rates compared to opioid naïve patients (ONP) following shoulder arthroplasty. This...
BACKGROUND
Preoperative opioid users (POU) experience worse outcomes and higher complication rates compared to opioid naïve patients (ONP) following shoulder arthroplasty. This study evaluates the effects of socioeconomic status (SES), as measured by the distressed communities index (DCI), on pre- and postoperative opioid use and its influence on clinical outcomes such as readmission and revision surgery.
METHODS
A retrospective review of patients who underwent primary shoulder arthroplasty (CPT code 23472) from 2014-2022 at a single academic institution was performed. Exclusion criteria included arthroplasty for fracture, active malignancy, and revision arthroplasty. Demographics, Charlson Comorbidity Index (CCI), DCI, and clinical outcomes including 90-day readmission and revision surgery were collected. Patients were classified according to the DCI score of their zip code. Using the Prescription Drug Monitoring Program database, patient pre- and postoperative opioid use in morphine milligram equivalents (MME) was gathered.
RESULTS
Individuals from distressed communities utilized more opioids within 90 days preoperatively compared to patients from prosperous, comfortable, mid-tier, and at-risk populations respectively. Patients from distressed communities also used significantly more opioids within 90 days postoperatively compared to prosperous, comfortable, and mid-tier respectively. Of patients from distressed communities, 35.1% developed prolonged opioid use (filling prescriptions >30 days after surgery), significantly more than all other cohorts. Among all patients, 3.5% were readmitted within 90 days and were more likely to be prolonged opioid users (38.9 vs 21.3%, p<0.001). Similarly, 1.5% of patients underwent revision surgery. Those who underwent revision were significantly more likely to be prolonged opioid users (38.2 vs 21.7%, p=0.002).
CONCLUSIONS
Shoulder arthroplasty patients from distressed communities use more opioids within 90 days before and after their surgery and are more likely to become prolonged opioid users placing them at risk for readmission and revision surgery. Identifying patients at an increased risk for excess opioid use is essential to employ appropriate strategies that minimize the detrimental effects of prolonged use following surgery.
PubMed: 38852706
DOI: 10.1016/j.jse.2024.04.016 -
BMC Musculoskeletal Disorders Jun 2024Osteosynthesis using antegrade intramedullary nailing for humeral shaft fractures yields satisfactory bone union rates; however, it may adversely affect postoperative...
Risk factors of poor mid-term shoulder functional outcomes of osteosynthesis using antegrade intramedullary nailing for humeral shaft fractures: a retrospective study with a minimum 5-year follow-up.
BACKGROUND
Osteosynthesis using antegrade intramedullary nailing for humeral shaft fractures yields satisfactory bone union rates; however, it may adversely affect postoperative shoulder function. To date, factors affecting mid- or long-term shoulder functional outcomes following intramedullary nail fixation have not been clarified. In this study, we aimed to identify the risk factors for poor mid-term functional outcomes over 5 years postoperatively following antegrade intramedullary nail osteosynthesis for humeral shaft fractures.
METHODS
We retrospectively identified 33 patients who underwent surgery using an antegrade intramedullary nail for acute traumatic humeral shaft fractures and were followed up for at least 5 years postoperatively. We divided the patients into clinical failure and no clinical failure groups using an age- and sex-adjusted Constant score of 55 at the final follow-up as the cutoff value. We compared preoperative, perioperative, and postoperative factors between the two groups.
RESULTS
Five of the 33 patients had poor shoulder functional outcomes (adjusted Constant score < 55) at a mean follow-up of 7.5 years postoperatively. Proximal protrusion of the nail at the time of bone union (P = 0.004) and older age (P = 0.009) were significantly associated with clinical failure in the univariate analyses. Multivariate analysis showed that proximal protrusion of the nail (P = 0.031) was a risk factor for poor outcomes.
CONCLUSIONS
The findings of this study provide new information on predictive factors affecting mid-term outcomes following osteosynthesis using antegrade nails. Our results demonstrated that proximal protrusion of the nail was significantly associated with poor mid-term functional shoulder outcomes. Therefore, particularly in older adults, it is essential to place the proximal end of the intramedullary nail below the level of the articular cartilage.
Topics: Humans; Retrospective Studies; Female; Male; Fracture Fixation, Intramedullary; Humeral Fractures; Middle Aged; Adult; Follow-Up Studies; Risk Factors; Aged; Bone Nails; Treatment Outcome; Range of Motion, Articular; Shoulder Joint; Fracture Healing; Recovery of Function; Young Adult
PubMed: 38851687
DOI: 10.1186/s12891-024-07572-1 -
Journal of ISAKOS : Joint Disorders &... Jun 2024Reverse shoulder arthroplasty (RSA) offers promising functional outcomes for young patients, yet challenges persist in restoring internal rotation (IR). This study aimed...
Restoration of Internal Rotation After Reverse Shoulder Arthroplasty May Vary Depending on Etiology in Patients Younger Than 60 Years Old: A Multicenter Retrospective Study.
BACKGROUND
Reverse shoulder arthroplasty (RSA) offers promising functional outcomes for young patients, yet challenges persist in restoring internal rotation (IR). This study aimed to assess the restoration of IR after RSA in patients younger than 60 years old and analyze the factors affecting IR recovery.
METHODS
A retrospective multicenter study was conducted, examining the functional outcome of patients who underwent RSA, with a minimum follow-up period of 2 years. Two subgroups of patients who underwent primary RSA were analyzed separately with respect to active (AIR1): "difficult AIR1" and "easy AIR1."
RESULTS
The study included 136 patients (overall series) with a mean age of 51.6 years. The overall series showed statistically significant improvement in active range of motion (RoM), pain, and Constant scores, especially with active IR (p<0.01). According to etiology, statistically significant improvement (p<0.05) in active IR was observed for fracture sequelae, primary osteoarthritis, and rheumatoid arthritis, while no statistically significant improvement in internal rotation was observed for tumor, revision, and cuff tear arthropathy (p>0.05). In subgroup analysis, patients with easy AIR1 displayed a statistically significant lower body mass index and better Constant score mobility, as well as improved motion in forward elevation and active IR (p<0.05). No statistically significant associations were found between improved IR and prosthetic design or subscapularis repair. Scapular notch, lysis of the graft, and teres minor atrophy were significantly associated with better active IR (p<0.05).
CONCLUSION
RSA improves active RoM, pain, and functional outcomes in patients under 60. However, the degree of improvement in IR may vary depending on several factors and the underlying etiologies. These insights are crucial for patient selection and counseling, guiding RSA optimization efforts.
LEVEL OF EVIDENCE
IV.
PubMed: 38851325
DOI: 10.1016/j.jisako.2024.05.016 -
BMC Musculoskeletal Disorders Jun 2024Posttraumatic wrist osteoarthritis is an irreversible and often progressive condition. Many surgical treatments, used in (daily) practice, aim to relieve symptoms like...
BACKGROUND
Posttraumatic wrist osteoarthritis is an irreversible and often progressive condition. Many surgical treatments, used in (daily) practice, aim to relieve symptoms like pain and restore function. The aim of this systematic review is to assess the patient reported and functional outcomes of the most common surgical interventions in patients with posttraumatic wrist osteoarthritis. This overview can help clinicians select the best treatment and manage patient's expectations.
METHODS
A literature search was performed in Pubmed, Embase and Cochrane for articles published between 1990 and November 2022 according to the PRISMA guidelines. The study protocol has been registered in the PROSPERO database (CRD42017080427). Studies that describe patient reported outcomes (pain and Disability of Arm, Shoulder and Hand (DASH) -score) and functional outcomes (range of motion (ROM) and grip strength) after surgical intervention with a minimal follow-up of 1 year were included. The identified surgical procedures included denervation, proximal row carpectomy, interpositional- and total arthroplasty, and midcarpal-, radiocarpal- and total arthrodesis. The pre-and postoperative outcomes were pooled and presented per salvage procedure.
RESULTS
Data from 50 studies was included. Pain score improved after all surgeries except denervation. Flexion/extension decreased after radiocarpal arthrodesis, did not show significant changes after proximal row carpectomy, and improved for all other surgeries. DASH score improved after arthroplasty, proximal row carpectomy and midcarpal arthrodesis. Grip strength improved after interposition arthroplasty and partial arthrodesis.
CONCLUSION
Evidence from this review did not support the indication for denervation in this particular patient population. In patients with SLAC/SNAC II, proximal row carpectomy might be favourable to a midcarpal arthrodesis solely based on better FE ROM of the radiocarpal joint after proximal row carpectomy. In terms of radiocarpal mobility, total wrist arthroplasty might be preferred to radiocarpal arthrodesis in patients with osteoarthritis after a distal radius fracture. More uniform measurements of outcomes would improve the understanding of the effect of surgical treatments of the posttraumatic osteoarthritic wrist.
Topics: Humans; Osteoarthritis; Wrist Joint; Range of Motion, Articular; Patient Reported Outcome Measures; Salvage Therapy; Arthrodesis; Hand Strength; Treatment Outcome; Wrist Injuries; Recovery of Function; Denervation
PubMed: 38849773
DOI: 10.1186/s12891-024-07527-6 -
Archives of Orthopaedic and Trauma... Jun 2024Reverse shoulder arthroplasty (RSA) is a frequently used therapy for complex proximal humeral fractures and posttraumatic disorders. The present study's purpose was to...
BACKGROUND
Reverse shoulder arthroplasty (RSA) is a frequently used therapy for complex proximal humeral fractures and posttraumatic disorders. The present study's purpose was to assess the clinical and radiological outcome of primary and secondary RSA, and to analyze the impact of refixation of the greater tuberosity (GT).
PATIENTS AND METHODS
28 patients with primary fracture RSA and 18 patients with RSA due to posttraumatic disorders were examined with a mean clinical follow-up of 2.5 ± 1.73 years. Operative details and radiographs were retrospectively reviewed. Additional analyses were performed for healed and non-healed GT in primary RSA.
RESULTS
Patients with fracture RSA had higher Constant-Murley score (CMS) than secondary RSA without reaching significance (p = 0.104). No significant difference was present for the quality of life measured by the Short Form 36 (SF 36) and the range of motion. In primary RSA, 78.6% GT healed anatomically. Compared to non-healed GT, patients with healed GT had a significantly higher CMS (p = 0.011), external rotation (p = 0.026) and forward flexion (p = 0.083), whereas DASH score was lower without a significant difference (p = 0.268). SF 36 showed no significant difference. Patients with healed GT had a more neutral glenoid version (p = 0.009).
CONCLUSION
Superior range of motion and clinical outcome scores were present for anatomically healed GT. Therefore, refixation of the tuberosities is recommended. Secondary RSA can result in inferior results compared to primary RSA, so patients need to be adequately informed.
PubMed: 38847836
DOI: 10.1007/s00402-024-05395-2 -
Journal of Shoulder and Elbow... 2024Although glenoid bone grafting and metallic augmented baseplates have demonstrated success in restoring the glenohumeral joint line in the recent literature, there...
BACKGROUND
Although glenoid bone grafting and metallic augmented baseplates have demonstrated success in restoring the glenohumeral joint line in the recent literature, there remain no consensus guidelines defining the use of one versus the other.
METHODS
Between 2017 and 2020, 15 primary RTSA with screw-in metallically augmented glenoid baseplates were identified and 2:1 matched by age, sex, and body mass index with primary bony-augmented glenoid baseplate patients. Patients with previous glenoid implantation or fracture were excluded. Charts, routine radiographic series (Grashey, Scapula Y, Axillary lateral), and 3-dimensional computed tomography (3D CT) scans were retrospectively reviewed. Structural patient-specific metal or bony augmentation was indicated based on preoperative glenoid morphology as identified by 3D CT. Aseptic failure was identified as hardware breakage and/or shift in glenoid baseplate component position.
RESULTS
There were 45 eligible cases with mean age of 65.7 years (range 44-85 years) and 65.5 years (range 42-82 years) for the metallic-augmented and bone graft group, respectively. Correspondingly, mean follow up was 22.6 months (range 12-53 months), and 27.3 months (range 11-53 months). At latest follow up, there were no baseplate failures in the metallic augment group and 2 baseplate failures (7%) in the bone graft group at a mean of 42.5 months (range 32-53 months) postoperatively. Mean age of the bone failure group was 64.5 years (range 64-65 years).
CONCLUSION
Contemporary reversed shoulder arthroplasty glenoid baseplate designs appear to have low incidence of failure. Further analysis is necessary to determine if a critical degree of glenoid retroversion or inclination is preferable with a specific form of augmentation.
LEVEL OF EVIDENCE
III; Retrospective Cohort Comparison.
PubMed: 38846321
DOI: 10.1177/24715492241259470