Reverse shoulder arthroplasty for complex fractures of the proximal humerus in elderly patients: impact on the level of independency, early function, and pain medication

Non-union of the greater tuberosity in patients undergoing reverse total shoulder arthroplasty for proximal humerus fracture: Is it associated with worse outcomes?

BACKGROUND

4-part proximal humerus fractures are complex injuries that are often associated with comminution of the greater tuberosity. The purpose of this study is to evaluate the functional outcomes of 4-part humerus fractures that are treated with reverse total shoulder arthroplasty (rTSA) and correlate these outcomes with the healing status of the greater tuberosity.

MATERIAL AND METHODS

A retrospective observational study was performed including 65 patients who underwent rTSA following a 4-part proximal humerus fracture. These patients were categorized into 3 groups according to the healing status of the greater tuberosity: patients with healed greater tuberosity in an anatomical position (group A, n = 43), patients with non-union of the greater tuberosity but in anatomical position (group B, n = 14), and patients with resorption or non-union of the greater tuberosity not in anatomical position (group C, n = 8). The Constant-Murley score and range of motion were recorded for each patient at 12 months postoperatively. The clinical and radiographical outcomes of the 3 groups were compared.

RESULTS

Patients with healed greater tuberosity (group A) had higher range of motion compared to patients with greater tuberosity migration or reabsorption (group C) regarding forward flexion (130° vs 80°, p < 0.001), abduction (110° vs 65°, p < 0.001) and external rotation (20° vs 10°, p = 0.004). However, no significant changes regarding forward flexion (130° vs 125°, p = 0.67), abduction (110° vs 100°, p = 0.60) and external rotation (20° vs 25°, p = 0.37) were noted between patients with healed greater tuberosity (group A) and those with non-united greater tuberosity that remained attached to the humeral prosthesis (group B). Similarly, Constant- Murley score was similar between patients of group A and group B (65.0 vs 61.5, p = 0.53), while it was higher in patients of group A compared to those of group C (65.0 vs 39.0, p = 0.053).

CONCLUSIONS

The outcomes of this study indicate that reliable recovery regarding range of motion and functional status can be achieved in patients who undergo rTSA due to 4-part proximal humerus fractures, as long as the greater tuberosity remains in close proximity to the humeral prosthesis, even if it has signs of non-union with no continuity to the adjacent humerus.

Locked Stem Reverse Total Shoulder Arthroplasty for Complex Proximal Humerus Fracture in the Elderly: Clinical and Radiological Short-Term Results

Purpose

To evaluate both the short-term clinical and radiological results of reverse shoulder arthroplasty (RSA) with uncemented locked stem in the management of a proximal humerus fracture (PHFs) in the elderly.

Methods

Retrospective study including 40 consecutive 3-4 part proximal humerus fractures treated with reverse shoulder arthroplasty with a minimum of 24 months follow-up. In all the cases, the greater tuberosity (GT) was reattached with a standardized suture technique and a local horseshoe bone graft. All the patients were assessed at the 24-month follow-up with Constant-Murley Score (CMS) and Visual Analog Score (VAS). Radiographic healing of the greater tuberosity was noted in addition to stem locking screws radiographic changes. Complications and revision rates were reported.

Results

Mean final CMS for this cohort was 80 points. The greater tuberosity healed in the anatomic position in 90% of the cases (N = 36), obtaining an average CMS of 80 in these patients. Healing of the greater tuberosity did not occur in 10% of the cases (N = 4), obtaining an average CMS of 60. All patients scored above 100° in forward elevation with a mean of 140°. Mean active external rotation was 30°. Low-grade scapular notching was reported in <1% of the cases. Major complications were reported in one patient with an acromial fracture. No complications or loosening of stem locking screws were noted. There were no reoperations.

Conclusion

In the elderly population, reverse shoulder arthroplasty utilizing a fracture-specific locking stem, low-profile metaphysis, suture-friendly groove, meticulous suture technique, and local bone grafting allows adequate fixation, variable prosthesis height adjustment, and enhances greater tuberosity healing. This approach yields positive short-term clinical outcomes without complications related to the stem's locking screws.

Level of Evidence

Level IV Retrospective Case Series.

Reverse Shoulder Arthroplasty versus Non-Operative Treatment of Three-Part and Four-Part Proximal Humerus Fractures in the Elderly Patient: A Pooled Analysis and Systematic Review

Background: The treatment of complex proximal humerus fractures in elderly patients is not yet fully elucidated. Of all treatment options, reverse shoulder arthroplasty (RSA) and non-operative treatment (NOT) appear to provide the best results. Evidence to guide the choice between the two is sparse. Therefore, this review provides an overview of the available evidence on RSA versus NOT. Methods: Studies comparing complex proximal humerus fractures in patients aged >65 years treated either with RSA or NOT were included for systematic review and direct comparison via pooled analysis of patient-rated outcome and range of motion. Indirect comparison of case series and non-comparative studies on either treatment was performed separately. Results: Three comparative studies including 77 patients treated with RSA and 81 treated non-operatively were analysed. The RSA group scored better for both the Constant-Murley score (mean difference 6 points) and DASH score (mean difference 8 points). No differences were detected in ASES, PENN score, pain scores, or range of motion between treatment groups. The most common complications for RSA were infection (3%), nerve injury (2%), and dislocation (2%). Reoperation was required in 5%. In the NOT group, common complications included malunion (42%), osteonecrosis (25%), and non-union (3%); no reoperation was required. Patient satisfaction was equal in both groups. Conclusions: The functional outcomes and range of motion after RSA seemed satisfactory and potentially superior to NOT in elderly patients. Patient satisfaction was comparable despite a high malunion and osteonecrosis rate in the non-operative treatment group, which did not require re-interventions.

Satisfactory Short-Term Outcomes of Reverse Shoulder Arthroplasty for Complex Three- and Four-Part Fractures of the Humeral Head in Octogenarians

BACKGROUND

Proximal humeral fractures with severe comminution and poor bone quality are among the most common injuries in the elderly population. Reverse shoulder arthroplasty (RSA) has been widely used to manage complex three- and four-part humeral head fractures. The purpose of the present study was to report the result of this technique in the demanding population of octogenarians.

MATERIALS AND METHODS

 Twenty-six patients above the age of 80 years were included in the study and followed for a minimum of one-year follow-up. To assess the functional outcomes the postoperative range of motion (ROM), the Constant score, the visual analog scale for pain, and the disability of the arm and shoulder score (DASH) were measured at 6 and 12 months. Radiological assessment and potential complications were also recorded.

RESULTS

The mean age of the study population was 81.9 years (81-86) at the time of surgery. There was a statistically significant improvement in all outcomes over the follow-up intervals. Shoulder ROM was 125.7o for flexion, 98.2o for abduction, 42.2o for internal rotation, and 43.2o for external rotation at 12 months. The mean Constant, DASH, and VAS scores at the last follow-up were 61.3, 31.9, and 0.5, respectively. Reported complications include one superficial surgical site infection.

CONCLUSION

RSA is a safe and reliable surgical option with satisfactory outcomes to manage complex three- and four-part fractures of the humeral head as it can provide prompt pain relief and function in octogenarians.

Reverse total shoulder arthroplasty for complex proximal humerus fracture in the elderly: clinical and radiological results

Background

The use of reverse total shoulder arthroplasty (RSA) for the treatment of proximal humeral fractures (PHFs) is steadily increasing. Better clinical outcomes of RSA have been correlated with tuberosity reattachment and healing. The purpose of this study was to evaluate both the clinical and radiological results of reverse shoulder arthroplasty in the management of a proximal humerus fracture in the elderly.

Methods

Retrospective study including 400 consecutive 3-4 part proximal humerus fractures treated with reverse shoulder arthroplasty with a minimum of 12-month follow-up. In all the cases, the greater tuberosity was reattached with a standardized suture technique and a local bone graft. All the patients were assessed at the 12-month follow-up with Constant-Murley Score (CMS). Radiographic healing of the greater tuberosity was noted. Complications and revision rates were reported.

Results

Mean final CMS for this cohort was 82 points. The greater tuberosity healed in anatomic position in 85% of the cases (N = 340), obtaining an average CMS of 85 in these patients. Healing of the greater tuberosity did not occur in 13% of the cases (N = 52) and displacement more than 5 mm occurred in 2% (N = 8) of the patients for an average CMS of 60. All patients scored above 120° in forward elevation with a mean of 150°. Mean active external rotation was 35°. The lateralization shoulder angle had a mean of 91° and the distalization shoulder angle had a mean of 54°. Low-grade scapular notching was reported in <1% of the cases. A total of 60 patients presented failure of healing or displacement of the greater tuberosity. Major complications were reported in nine patients. Of these nine patients, two acquired superficial wound infections, while two had deep shoulder prosthetic infection. Two other patients developed hematomas, one sustained an acromial stress fracture, and two had a stem loosening. There were 4 reoperations.

Conclusion

Reverse shoulder arthroplasty, with the use of a fracture-specific stem, allows an improved rate of greater tuberosity healing and short-term clinical outcomes in the elderly population.

How common is nerve injury after reverse shoulder arthroplasty? A systematic review

BACKGROUND

Nerve injury following reverse shoulder arthroplasty (RSA) is a known risk factor with wide ranging incidences reported. This systematic review evaluates the overall incidence of nerve injury following primary and revision RSA and summarizes the characteristics of the nerve injuries reported in the current literature.

METHODS

A systematic review was performed using separate database searches (Pubmed, Embase, Web of Science, Cochrane) following the PRISMA guidelines. Search criteria included the title terms "reverse shoulder," "reverse total shoulder," "inverted shoulder," and "inverted total shoulder" with publication dates ranging from 01/01/2010 to 01/01/2022. Studies that reported neurological injuries and complications were included and evaluated for primary RSA, revision RSA, number of nerve injuries, and which nerves were affected.

RESULTS

After exclusion, our systematic review consisted of 188 articles. A total of 40,146 patients were included, with 65% female. The weighted mean age was 70.3 years. The weighted mean follow-up was 35.4 months. The rate of nerve injury after RSA was 1.3% (510 of 40,146 RSAs). The rate of injury was greater in revision RSA compared to primary RSA (2.4% vs. 1.3%). Nerve injury was most common in RSAs done for a primary diagnosis of acute proximal humerus fracture (4.0%), followed by cuff tear arthropathy (3.0%), DJD (2.6%), and inflammatory arthritis (1.7%). Massive rotator cuff tears and post-traumatic arthritis cases had the lowest nerve injury rates (1.0% and 1.4%, respectively). The axillary nerve was the most commonly reported nerve that was injured in both primary and revision RSA (0.6%), followed by the ulnar nerve (0.26%) and median nerve (0.23%). Brachial plexus injury was reported in 0.19% of overall RSA cases.

CONCLUSION

Based on current English literature, nerve injuries occur at a rate of 1.3% after primary RSA compared with 2.4% after revision RSA. The most common nerve injury was to the axillary nerve (0.64%), with the most common operative diagnosis associated with nerve injury after RSA being acute proximal humerus fracture (4.0%). Surgeons should carefully counsel patients prior to surgery regarding the risk of nerve injury.

Reverse Total Shoulder Arthroplasty Demonstrates Better Outcomes Than Angular Stable Plate in the Treatment of Three-part and Four-part Proximal Humerus Fractures in Patients Older Than 70 Years

BACKGROUND

Proximal humeral fractures are traditionally treated with open reduction and internal fixation (ORIF), but reverse total shoulder arthroplasty (RTSA) has emerged as an increasingly popular treatment option. Although ORIF with angular locking plates is a common treatment for proximal humerus fractures, prior reports suggest high failure and complication rates. Although RTSA has become an increasingly popular option for complex proximal humeral head fractures given its low complication rates, there are concerns it may lead to limited postoperative ROM. Thus, the optimal treatment for patients older than 70 years from a functional and radiographic perspective remains unclear.

QUESTIONS/PURPOSES

(1) In patients older than 70 years with three-part and four-part proximal humerus fractures, does RTSA result in better functional outcome scores (Constant, American Shoulder and Elbow Surgeons [ASES], and DASH scores) than ORIF with a locking plate? (2) Does RTSA result in greater ROM than ORIF? (3) Does RTSA result in a lower risk of complications than ORIF? (4) In patients with either procedure, what are the rates of negative radiographic outcomes in those treated with ORIF (such as malunion, bone resorption, malalignment, or avascular necrosis) or those with RTSA (such as resorption, notching, and loosening)? (5) At a minimum of 2 years of follow-up, does ORIF result in a greater number of revision procedures than RTSA?

METHODS

Between January 1, 2013, and June 30, 2018, we treated 235 patients for a proximal humeral fracture. We considered only patients without previous ipsilateral fracture or surgery, other fractures, or radial nerve injuries; age older than 70 years; and patients without neurologic disease or cognitive dysfunction as potentially eligible. Sixty-nine percent (162 patients) of the patients were eligible; a further 31% (73 patients) were excluded because 18% (13 of 73 patients) did not meet the inclusion criteria, 62% (45 patients) underwent nonoperative treatment, and 21% (15 patients) declined to participate. Patients were nonrandomly allocated to receive RTSA if they had supraspinatus Goutallier/Fuchs Grade 3 or 4 atrophy or ORIF if they had supraspinatus Goutallier/Fuchs Grade 1 or 2 atrophy. This left 81 patients who were treated with RTSA and another 81 patients who were treated with ORIF. Among the 81 patients treated with RTSA, 11% (nine patients) were lost to the minimum study follow-up of 2 years or had incomplete datasets, leaving 89% (72 patients) for analysis. Among the 81 patients treated with ORIF, 19% (15 patients) were lost before the minimal study follow-up of 2 years or had incomplete datasets, leaving 82% (66 patients) for analysis. The median follow-up for both groups was 53 months (range 24 to 72 months). The mean age was 76 ± 2.9 years in the RTSA group and 73 ± 2.9 years in the ORIF group. In the RTSA group, 27 patients had a three-part fracture and 45 patients had a four-part fracture. In the ORIF group, 24 patients had three-part fractures and 42 patients had four-part fractures (p = 0.48). Shoulder function was assessed using functional outcome questionnaires (ASES, DASH, and Constant) and active ROM measurements. A surgical complication was defined as any instance of dislocations, fractures, adhesive capsulitis, nerve injuries, or surgical site infections. Radiographic outcomes after ORIF (malunion, tuberosity resorption, or avascular necrosis) and RTSA (notching and osteolysis) were assessed. In calculating the revision rate, we considered unplanned revision procedures only.

RESULTS

Compared with patients treated with ORIF, patients treated with RTSA had superior improvements in Constant (85.0 ± 7.0 versus 53.0 ± 5.0; mean difference 32 [95% CI 30 to 34]; p < 0.01), ASES (46.3 ± 3.7 versus 30.0 ± 3.5; mean difference 16 [95% CI 15 to 18]; p < 0.01), and DASH scores (40.5 ± 4.2 versus 30.5 ± 2.6; mean difference 10 [95% CI 9 to 11]; p < 0.01). The mean elevation was 135° ± 7° for patients with RTSA and 100° ± 6° for patients with ORIF (mean difference 35 o [95% CI 33 to 37]; p < 0.01). The mean abduction was 131° ± 7° for patients with RTSA and 104° ± 6° for those with ORIF (mean difference 27 o [95% CI 25° to 29°]; p < 0.01). The mean external rotation was 85° ± 5° for patients with RTSA and 64° ± 5° for those with ORIF (mean difference 21° [95% CI 19° to 23°]; p < 0.01). The mean internal rotation was 45° ± 6° for patients with RTSA and 40° ± 6° for those with ORIF (mean difference 5° [95% CI 3° to 7°]; p < 0.01). The risk of complications was not different between patients with ORIF and those with RTSA (5% [three of 66] versus 1% [one of 72]; relative risk 3.3 [95% CI 0.3 to 30.7]; p = 0.30). Among patients with ORIF, 8% had varus malunions (five of 66), 6% had resorption of the greater tuberosity (four of 66), and 2% had avascular necrosis of the humeral head (one of 66). In the RTSA group, 24% (17 of 72 patients) demonstrated reabsorption of periprosthetic bone and 79% of patients (57 of 72) exhibited no notching. The risk of revision was not different between the RTSA and ORIF groups (0% [0 of 72] versus 9% [six of 66]; relative risk 0.07 [95% CI 0.0 to 1.2]; p = 0.07).

CONCLUSION

In patients older than 70 years with three-part and four-part proximal humerus fractures, primary RTSA resulted in better patient-reported outcome scores and better ROM than ORIF with an angular stable locking plate. Our findings might help surgeons decide between internal fixation and arthroplasty to surgically treat these injuries in older patients. Although RTSA seems to be a preferable treatment modality in view of these findings, longer follow-up is required to evaluate its longevity compared with ORIF with an angular locking plate. Dissimilar to ORIF, which is generally stable once healed, arthroplasties are at a continued risk for loosening and infection even after healing is complete.

LEVEL OF EVIDENCE

Level II, therapeutic study.

Reverse shoulder arthroplasty for proximal humerus fractures: a comparison of the deltoid split and deltopectoral approaches

INTRODUCTION

Reverse shoulder arthroplasty (RSA) is a common treatment for three- and four-part proximal humerus fractures. RSA is commonly performed through a deltopectoral (DP) surgical approach; however, a deltoid split (DS) approach has been described. The purpose of this study was to compare the intraoperative and postoperative outcomes of patients undergoing RSA for proximal humerus fractures through a DP and DS approach.

MATERIALS AND METHODS

A retrospective study of patients who underwent RSA for proximal humerus fractures at our level 1 trauma center was performed. Patients were evaluated at a minimum 1-year follow-up. Intraoperative outcomes as well as patient-reported outcome measures (PROMs) were analyzed. Postoperative complications, reoperation rates, and radiographic outcomes were evaluated.

RESULTS

Sixteen patients were included in the DP group and 13 patients in the DS group. The average follow-up was 28.6 months in the DP group and 21.1 months in the DS group. There were no significant differences in patient demographics or injury characteristics. Operative time was significantly shorter in the DS group (103 min) compared to the DP group (123 min). Tuberosity repair was performed in 81.3% of patients in the DP group and 92.3% of patients in the DS group. No significant differences were found in PROMs at final follow-up. There were no significant differences in postoperative complications. Three patients in the DP group and one patient in the DS group required reoperation. Lastly, 81.8% of patients achieved tuberosity union in the DS group and 66.7% in the DP group; however, this did not reach statistical significance.

CONCLUSION

This study demonstrates that RSA for proximal humerus fractures performed through a DS or DP approach may result in similar intraoperative and postoperative outcomes, with no difference in reoperation or complication rates.

Clinical outcomes of cemented vs. uncemented reverse total shoulder arthroplasty for proximal humerus fractures: a systematic review

BACKGROUND

Reverse total shoulder arthroplasty is an established treatment method for comminuted proximal humerus fractures. Both cemented and uncemented techniques exist, with uncemented reverse total shoulder offering many theoretical advantages, including improved biologic fixation, absence of cement related complications, and ease of revision if necessary. There are few studies comparing the outcomes of the two techniques.

METHODS

The study was performed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. A search for studies assessing clinical outcomes of reverse total shoulder arthroplasty for proximal humerus fractures was performed of PubMed, Embase, Web of Science, and Cochrane Library. Main outcomes included Constant Score (CS), American Shoulder and Elbow Surgeons (ASES) score, and complication rate. Inclusion criteria were as follows: indication for arthroplasty was fracture; minimum one year follow up; article in English. Exclusion criteria were as follows: review articles; biomechanical or cadaver studies. Quality analysis was performed using the Cochrane Risk of Bias tool (RoB 2) and the Risk of Bias in Non-randomized Studies-of Interventions (ROBINS-I) tool.

RESULTS

A total of 682 studies were identified through the initial search, with 36 studies meeting all inclusion criteria. There were 24 studies investigating cemented technique, 10 studies examining uncemented technique, and two studies involving both techniques. There was no difference in mean follow up between patients receiving a cemented vs. uncemented rTSA (32.3 months vs. 30.6 months, p = 0.06). Patients who received a cemented rTSA had a significantly higher Constant-Murley score than those who received an uncemented rTSA (59.4 vs 55.9, p < .001). There was no difference between the two groups when comparing ASES Scores (77.5 vs 78.6, p = 0.54) and overall complication rates (11.1% vs 11.8%, p = 0.23).

CONCLUSION

Both cemented and uncemented rTSA are both valid options for treating acute proximal humerus fractures. Cemented rTSA may portend slightly improved clinical outcomes with similar overall complication rates compared to uncemented rTSA for proximal humerus fractures.

Influence of rotator cuff preload on fracture configuration in proximal humerus fractures: a proof of concept for fracture simulation

INTRODUCTION

In regard of surgical training, the reproducible simulation of life-like proximal humerus fractures in human cadaveric specimens is desirable. The aim of the present study was to develop a technique that allows simulation of realistic proximal humerus fractures and to analyse the influence of rotator cuff preload on the generated lesions in regards of fracture configuration.

MATERIALS AND METHODS

Ten cadaveric specimens (6 left, 4 right) were fractured using a custom-made drop-test bench, in two groups. Five specimens were fractured without rotator cuff preload, while the other five were fractured with the tendons of the rotator cuff preloaded with 2 kg each. The humeral shaft and the shortened scapula were potted. The humerus was positioned at 90° of abduction and 10° of internal rotation to simulate a fall on the elevated arm. In two specimens of each group, the emergence of the fractures was documented with high-speed video imaging. Pre-fracture radiographs were taken to evaluate the deltoid-tuberosity index as a measure of bone density. Post-fracture X-rays and CT scans were performed to define the exact fracture configurations. Neer's classification was used to analyse the fractures.

RESULTS

In all ten cadaveric specimens life-like proximal humerus fractures were achieved. Two III-part and three IV-part fractures resulted in each group. The preloading of the rotator cuff muscles had no further influence on the fracture configuration. High-speed videos of the fracture simulation revealed identical fracture mechanisms for both groups. We observed a two-step fracture mechanism, with initial impaction of the head segment against the glenoid followed by fracturing of the head and the tuberosities and then with further impaction of the shaft against the acromion, which lead to separation of the tuberosities.

CONCLUSION

A high energetic axial impulse can reliably induce realistic proximal humerus fractures in cadaveric specimens. The preload of the rotator cuff muscles had no influence on initial fracture configuration. Therefore, fracture simulation in the proximal humerus is less elaborate. Using the presented technique, pre-fractured specimens are available for real-life surgical education.

LEVEL OF EVIDENCE

III.

Outcome of geriatric proximal humeral fractures: a comparison between reverse shoulder arthroplasty versus open reduction and internal fixation

Objectives:

In view of the increased attention to reverse shoulder arthroplasty (rTSA) as a treatment for complex proximal humeral fractures in the elderly, the present study analyzes in-hospital complications and the postoperative management of rTSA versus open reduction and internal fixation (ORIF).

Methods:

We retrospectively reviewed patients hospitalized from 2016 to 2018 for proximal humeral fractures (ICD-9 codes: S42.21), III- and IV-part, who underwent an ORIF with locking plates, rTSA or nonoperative treatment. In-hospital complications and postoperative management in both groups were included in the analysis.

Results:

We included n 190 patients (ORIF 90, rTSA 71, nonoperative 29), more likely to be female (82.1% vs 17.9%; P < .01) with an average age of 82years (min. 72, max. 99; SD 6.4). The ORIF and the rTSA groups showed comparable complication rates (15.6% vs 15%, P = .87) but with a significantly shorter hospital stay (8.6 vs 11.5days; P = .01) and shorter duration of surgery (72.9 vs 87.2 minutes; P = .01) in the ORIF group. Significantly more patients after ORIF achieved an independent life postoperatively (53.3% vs 40.8%; P = .013).

Conclusions:

In this retrospective analysis, ORIF is related to a shorter duration of surgery, a shorter hospital stay and a higher likelihood of independence. Despite the popularity of the rTSA, ORIF remains a reliable treatment option for proximal humeral fractures in the elderly.

Level of evidence: III

Complications and Intraoperative Fractures in Reverse Shoulder Arthroplasty: A Systematic Review

Introduction

The reverse shoulder arthroplasty is nowadays a treatment option for a variety of shoulder problems. As its incidence rose, also the number of complications increased, including intraoperative fractures.

Significance

We performed a systematic review and critical analysis of the current literature following the PRISMA guidelines. Our purpose was to: 1) determine incidence, causes, and characteristics of intraoperative fractures; 2) evaluate their current treatment options, possible related complications, reoperation rates, and the patients’ outcome; and 3) determine the overall incidence of each complication related to reverse shoulder arthroplasty. The articles were selected from PubMed medical database in April 2020 using a comprehensive search strategy. Rayyan software was used to support the selection process of the records. A descriptive and critical analysis of the results was performed.

Results

The study group included a total of 13,513 reverse shoulder arthroplasty procedures. The total number of complications was 1647 (rate 12.1%). The most common complication was dislocation (340 cases, rate 2.5%). Forty-six studies reported a total of 188 intraoperative fractures among the complications (rate 1.4%). The intraoperative fracture rate was 2.9% and 13.6% in primary and revision settings, respectively. There were 136 humeral fractures, 60% of them occurred in revision RSAs, during the removal of the previous implant, and involved the shaft in the majority of cases (39%). Glenoid fractures were 51 and occurred mostly during the reaming of the glenoid. We observed 7 further related complications (rate of 4%) and 3 reoperations (rate of 1.5%). The outcome was satisfactory in the majority of cases.

Conclusions

A comprehensive review on intraoperative fractures in reverse shoulder arthroplasties is presented. Results suggest favorable outcomes for all treatment methods, with a modest further complication rate. This investigation may aid in the treatment decision-making for these complications.

How age and gender influence proximal humerus fracture management in patients older than fifty years

Background

As the aging population expands, proximal humerus fractures have become more prevalent. This study aimed to evaluate acute management of proximal humerus fractures in women and men older than the age of 50 years to determine how gender and age have affected definitive treatment selection over the last decade.

Methods

Patient records were retrospectively reviewed from a commercially available database, PearlDiver, to identify treatments for proximal humerus fractures between 2010 and 2019. Data were separated by age into two cohorts, patients aged 50-64 years and those aged 65 years and older before stratification by gender. Within each cohort, groups were matched with respect to age, region, and Elixhauser comorbidity index. Logistic regression analyses were performed to determine which gender was associated with a higher risk of undergoing operative treatment, which gender was associated with a higher risk of receiving arthroplasty, and which of the individual surgical operations were more likely given the patient’s gender and age.

Results

In the 50- to 64-year-old cohort, men were less likely to be treated operatively than women (odds ratio [OR]: 0.90). However, men in this cohort had a 31% higher likelihood of receiving an arthroplasty procedure than women when given operative treatment. Specifically, men aged 50 to 64 years were more likely to receive hemiarthroplasty (OR: 1.48) and intramedullary nailing (OR: 1.19) and were less likely to have open reduction internal fixation (ORIF) (OR: 0.71). In the 65 years and older cohort, there was no relationship between gender and the likelihood of operative treatment for a proximal humerus fracture. Men older than 65 years had a 29% lower likelihood of receiving an arthroplasty type procedure than women older than 65 years. In addition, men older than 65 years were more likely to receive ORIF (OR: 1.14) and intramedullary nailing (OR: 1.43) and less likely to receive hemiarthroplasty (OR: 0.86) and reverse total shoulder arthroplasty (OR: 0.66) than similarly aged women.

Conclusion

Both age and gender have an association with the definitive treatment patients received for proximal humerus fractures over the last decade. Women younger than 65 years of age were more likely to undergo operative treatment, although once older than 65 years, there was no influence of gender on operative treatment. Men younger than 65 years were more likely to receive arthroplasty and women, more likely to undergo ORIF; however, as patients reached the age of 65 years and older, this finding was reversed such that women were more likely to receive arthroplasty and men, ORIF. Further exploration into these differences could improve decision-making between surgeons and patients.

CT-based and morphological comparison of glenoid inclination and version angles and mineralisation distribution in human body donors

Background

For optimal prosthetic anchoring in omarthritis surgery, a differentiated knowledge on the mineralisation distribution of the glenoid is important. However, database on the mineralisation of diseased joints and potential relations with glenoid angles is limited.

Methods

Shoulder specimens from ten female and nine male body donors with an average age of 81.5 years were investigated. Using 3D-CT-multiplanar reconstruction, glenoid inclination and retroversion angles were measured, and osteoarthritis signs graded. Computed Tomography-Osteoabsorptiometry (CT-OAM) is an established method to determine the subchondral bone plate mineralisation, which has been demonstrated to serve as marker for the long-term loading history of joints. Based on mineralisation distribution mappings of healthy shoulder specimens, physiological and different CT-OAM patterns were compared with glenoid angles.

Results

Osteoarthritis grades were 0-I in 52.6% of the 3D-CT-scans, grades II-III in 34.3%, and grade IV in 13.2%, with in females twice as frequently (45%) higher grades (III, IV) than in males (22%, III). The average inclination angle was 8.4°. In glenoids with inclination ≤10°, mineralisation was predominantly centrally distributed and tended to shift more cranially when the inclination raised to > 10°. The average retroversion angle was − 5.2°. A dorsally enhanced mineralisation distribution was found in glenoids with versions from − 15.9° to + 1.7°. A predominantly centrally distributed mineralisation was accompanied by a narrower range of retroversion angles between − 10° to − 0.4°.

Conclusions

This study is one of the first to combine CT-based analyses of glenoid angles and mineralisation distribution in an elderly population. The data set is limited to 19 individuals, however, indicates that superior inclination between 0° and 10°-15°, and dorsal version ranging between − 9° to − 3° may be predominantly associated with anterior and central mineralisation patterns previously classified as physiological for the shoulder joint. The current basic research findings may serve as basic data set for future studies addressing the glenoid geometry for treatment planning in omarthritis.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12891-021-04660-4.

Prosthesis Designs and Tuberosity Fixation Techniques in Reverse Total Shoulder Arthroplasty: Influence on Tuberosity Healing in Proximal Humerus Fractures

Reverse total shoulder arthroplasty (RTSA) is increasingly used for the treatment of complex proximal humerus fractures and fracture sequelae. In 2021, half a dozen models of fracture stems are commercially available, reflecting its growing utility for fracture management. Prosthesis designs, bone grafting and tuberosity fixation techniques have evolved to allow better and more reliable fixation of tuberosities and bony ingrowth. Patients with anatomical tuberosity healing not only have an increased range of active anterior elevation and external rotation, but also experience fewer complications and longer prosthesis survival. This review provides an overview of recent evidence on basic and fracture-specific RTSA design features as well as tuberosity fixation techniques that can influence tuberosity healing.

Fracture-Specific and Conventional Stem Designs in Reverse Shoulder Arthroplasty for Acute Proximal Humerus Fractures-A Retrospective, Observational Study

Tuberosity healing and stem design can be outcome-dependent parameters in hemiarthroplasty for proximal humerus fractures (PHF). The relevance of fracture-specific stem design in reverse shoulder arthroplasty (RSA) is still a matter of debate. This retrospective study evaluates tuberosity healing and function for fracture specific stems (A) compared to conventional stems (B) in RSA for complex PHF in 26 patients (w = 21, mean age 73.5 years). Clinically, range of motion (ROM), Constant-Murley-Score (CS), Subjective Shoulder Value (SSV), and external rotation lag signs (ERLS) were evaluated. Healing of greater tuberosity (GT) and lesser tuberosity (LT), scapular notching, and loosening were examined radiologically. There were no statistical significant differences with regards to CS (A: 73 ± 11; B: 77 ± 9 points), SSV (A: 78% ± 11%; B: 84% ± 11%), external rotation (A: 18° ± 20°; B: 24° ± 19°), or internal rotation (A: 5.7 ± 2.2; B: 6.7 ± 2.8 CS-points) (p > 0.05). Mean forward flexion was superior for group A (p = 0.036). Consolidation of GT (82%) and LT (73%) was similar in both groups. Anatomical healing was slightly higher in group B (p > 0.05). Scapular notching was found in 27% (A) and 55% (B) (p > 0.05). RSA for PHF provides good to excellent clinical results. The quantitative and qualitative union rate for both cohorts was similar, indicating that fracture stems with open metaphyseal designs to allow for bone ingrowth do not improve tuberosity healing. ERLS correlates with a worse function in CS and ROM in all planes.

Reverse Shoulder Arthroplasty for Proximal Humerus Fracture

PURPOSE OF REVIEW

The purpose of this review is to examine trends, outcomes, and principles in treatment of proximal humerus fractures in the elderly with a critical focus on reverse shoulder arthroplasty as a developing treatment option.

RECENT FINDINGS

Recent literature shows an increase in reverse shoulder arthroplasty and a decrease in hemiarthroplasty performed for proximal humerus fractures. More predictable outcomes and lower revision rates are seen in older individuals treated primarily or secondarily with reverse shoulder arthroplasty compared to those treated with hemiarthroplasty. We report current and historical treatments, outcomes, and principles in reverse shoulder arthroplasty for treatment of complex, displaced proximal humerus fractures in older individuals (≥ 65 years old).

The role of greater tuberosity healing in reverse shoulder arthroplasty: a finite element analysis

BACKGROUND

The lack of greater tuberosity (GT) healing in proximal humerus fractures has been negatively correlated with outcomes for hemiarthroplasty; however, there is still debate regarding the effects of GT healing in reverse shoulder arthroplasty (RSA). Our goal was to examine the effects of GT healing using a kinematic finite element analysis (FEA) model.

MATERIAL AND METHODS

Computer-aided design models of a medialized glenoid with a lateralized humerus (MGLH) RSA design were uploaded into an FEA shoulder model in 2 different configurations: healed greater tuberosity (HGT) and nonunion greater tuberosity (NGT). Deltoid muscle forces and joint reaction forces (JRFs) on the shoulder were calculated during abduction (ABD), forward flexion (FF), and external rotation (ER).

RESULTS

Force magnitude of the anterior, middle, and posterior deltoid muscle as well as JRFs modeled in both GT scenarios were similar for ABD (muscle forces P = .91, P = .75, P = .71, respectively; and JRF P = .93) and for FF (muscle forces P = .89, P = .83, P = .99, respectively; and JRF P = .90). For ER, the force magnitude between 2 GT settings showed statistically significant differences (HGT: 9.51 N vs. NGT: 6.13 N) (P < .001). Likewise, during ER, JRFs were different, and the NGT group showed a steep drop in JRF after 10° of ER (HGT: 28.4 N vs. NGT: 18.38 N) (P < .001).

CONCLUSION

GT healing does not seem to impact RSA biomechanics during abduction or forward flexion; however, it does affect biomechanics during external rotation. Overall orthopedic surgeons can expect good results for patients after RSA even with poor GT healing.

Cementless metaphyseal reverse shoulder arthroplasty: our preliminary experience

Reverse shoulder arthroplasty (rTSA) is a largely used procedure with a wide variety of indications. The incidence of this surgery is increased in recent years and the literature expects similar trend for the future. Metaphyseal stem rTSA seems to be a promising solution considering major objectives the preservation of humeral bone stock and ease of revision. In our study we analyzed 19 patients treated with cementless metaphyseal stem rTSA for osteoarthritis (group A) and acute fractures (group B). In group A (7 patients) the average Constant score improved from 21,57 (16-29) to 56,85 (38-72), the average SST improved from 2,29 (1-4) to 9,43 (8-12) and the mean VAS score improved from 14,29 to 4,86. In group B (12 patients) the mean Constant-Murlay score at last follow up was 42,17; the average SST was 7 and average pain score was 8,92. Overall active range-of-motion (ROM) improved significantly. Surgical considerations, clinical (analyzing Constant score and Simple Shoulder Test) and radiological short-term outcomes are encouraging, with low rate of complications. Long term follow-up studies are necessary to confirm our findings and the potential benefits related to these implants. (www.actabiomedica.it)

Grammont versus lateralizing reverse shoulder arthroplasty for proximal humerus fracture: functional and radiographic outcomes

PURPOSE

The aim of this study is to retrospectively compare clinical and radiographic outcomes of patients treated with non-lateralizing reverse shoulder arthroplasty (RSA) and with humeral lateralizing RSA after proximal humerus fracture (PHF).

METHODS

In total, 32 patients (8 men and 24 women), with a mean age of 77.4 (67-92), have been reevaluated (follow-up of 14.3 months) and divided into Grammont group (G-group-16 patients, 2 men and 14 women, mean age 82.3) and lateralizing group (L-group-16 patients, 4 men and 12 women, mean age 72.5). The dominant side was affected in 21 patients. Pain, Constant-Murley score (CMS), range of motion accurately measured with inertial sensors (SHoWlder, NCSLab^®) and complications. Anatomic tuberosity healing, signs of loosening or mobilization of the implants and scapular notching (according to Sirveaux classification) have been measured on standard X-ray series (antero-posterior view in neutral, external and internal rotation; axillary view; outlet view).

RESULTS

Similar CMS was recorded between the two groups (G-group: 61/100; L-group: 64/100). G-group had higher forward flexion (128° vs. 112°) and abduction (126° vs. 114°), L-group had higher external rotation in abduction (35° vs. 41°); similar internal rotation (sacrum) and rotation with elbow in adduction were measured (12° vs. 19°). No statistically significant differences emerged. Anatomic healing of the tuberosity was higher in G-group (87.5% vs. 50%); low-grade scapular notching was higher in L-group (18.25% grade 1-2 vs. 0). Anatomic healed tuberosity guaranteed highly statistically significant improved functional outcomes. No revisions of the implant were performed.

CONCLUSIONS

RSA can be considered a valid solution for the treatment of PHF in elderly low-demanding population. Cuff conditions should be investigated before surgery for the indication of the adequate model.

Going forward with reverse shoulder arthroplasty

Rotator cuff is a vital structure of glenohumeral joint, the dysfunction of which leads to debilitating pain and restricted movement. Arthroplasty using unconstrained anatomical prosthesis for treating these conditions have not been successful in the past. Reverse Shoulder Arthroplasty (RSA) is a novel technique specifically designed to address end stage glenohumeral arthritis in rotator cuff deficient joint. Short and mid-term studies have demonstrated a significant improvement in pain and range of motion of the shoulder joint. However there is a very high complication rate in comparison to total and hemiarthroplasty of shoulder joint. Over the years, there has been a steady increase in RSAs performed, both in volume and the indications for its use. This article discusses the biomechanical aspects, indications and critically reviews the clinical outcome following Reverse Shoulder Arthroplasty.