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Kim HM, Nguyen M, Groneck A. Internal rotation limitation is prevalent following modern reverse shoulder arthroplasty and negatively affects patients' subjective rating of the procedure. J Shoulder Elbow Surg 2024:S1058-2746(24)00258-1. [PMID: 38631457 DOI: 10.1016/j.jse.2024.03.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 02/13/2024] [Accepted: 03/03/2024] [Indexed: 04/19/2024]
Abstract
BACKGROUND Although forward elevation, abduction, and external rotation are often successfully restored, internal rotation (IR) is frequently not satisfactorily recovered following reverse shoulder arthroplasty (RSA), affecting patients' ability to perform certain daily activities. This study examined the prevalence of limited IR in patients receiving modern RSA and its impact on clinical outcomes and patient satisfaction with their RSA. METHODS A cross-sectional study was conducted on patients who had undergone primary RSA using a modern RSA prosthesis with a minimum 1-year follow-up. Patients returned for a research visit where they were examined for range of motion and surveyed for patient-reported outcome measures (PROMs) and subjective rating of the success level of their RSA. Postoperative range of motion data were compared with the preoperative data. The relationship of postoperative IR with PROMs and patients' subjective rating of RSA was analyzed. Logistic regression was performed to identify factors affecting patients' subjective rating of RSA. RESULTS A total of 78 patients met the criteria and completed the study. A significant portion (59%) reported subjective IR limitations, and 41% had objective IR limitations. Comparison of preoperative and postoperative IR showed that 24% had worsened IR, whereas 33% improved. Limited IR was associated with lower patients' subjective rating of RSA and negatively affected PROMs, especially when the dominant side was operated on. Regression analysis showed that limited IR was the only independent determining factor that was significantly associated with a lower subjective rating of RSA. DISCUSSION Despite advancements in RSA design, limited IR remains a prevalent issue, significantly affecting patients' satisfaction and clinical outcomes. This study underscores the need for setting appropriate expectations regarding IR through patient education and focused efforts to improve IR limitations in RSA patients, particularly on the dominant side.
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Affiliation(s)
- H Mike Kim
- Department of Orthopaedic Surgery, University of Missouri, Columbia, MO, USA.
| | - Michael Nguyen
- Department of Orthopaedic Surgery, University of Missouri, Columbia, MO, USA
| | - Andrew Groneck
- Department of Orthopaedic Surgery, University of Missouri, Columbia, MO, USA
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Hao KA, Kakalecik J, Cueto RJ, Janke RL, Wright JO, Wright TW, Farmer KW, Struk AM, Schoch BS, King JJ. Discordance between patient-reported and objectively measured internal rotation after reverse shoulder arthroplasty. J Shoulder Elbow Surg 2023; 32:2051-2058. [PMID: 37178957 DOI: 10.1016/j.jse.2023.03.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 03/07/2023] [Accepted: 03/22/2023] [Indexed: 05/15/2023]
Abstract
BACKGROUND Patient satisfaction after reverse shoulder arthroplasty (RSA) partly relies on restoring functional internal rotation (IR). Although postoperative assessment of IR includes objective appraisal by the surgeon and subjective report from the patient, these evaluations may not vary together uniformly. We assessed the relationship between objective, surgeon-reported assessments of IR and subjective, patient-reported ability to perform IR-related activities of daily living (IRADLs). METHODS Our institutional shoulder arthroplasty database was queried for patients undergoing primary RSA with a medialized-glenoid lateralized-humerus design between 2007-2019 and minimum 2-year follow-up. Patients who were wheelchair bound or had a preoperative diagnosis of infection, fracture, and tumor were excluded. Objective IR was measured to the highest vertebral level reached with the thumb. Subjective IR was reported based on patients' rating (normal, slightly difficult, very difficult, or unable) of their ability to perform 4 IRADLs (tuck in shirt with hand behind back, wash back or fasten bra, personal hygiene, and remove object from back pocket). Objective IR was assessed preoperatively and at latest follow-up and reported as median and interquartile ranges. RESULTS A total of 443 patients were included (52% female) at a mean follow-up of 4.4 ± 2.3 years. Objective IR improved pre- to postoperatively from L4-L5 (buttocks to L1-L3) to L1-L3 (L4-L5 to T8-T12) (P < .001). Preoperatively reported IRADLs of "very difficult" or "unable" significantly decreased postoperatively for all IRADLs (P ≤ .004) except those unable to perform personal hygiene (3.2% vs. 1.8%, P > .99). The proportions of patients who improved, maintained, and lost objective and subjective IR was similar between IRADLs; 14%-20% improved objective IR but lost or maintained subjective IR and 19%-21% lost or maintained the same objective IR but improved subjective IR depending on the specific IRADL assessed. When ability to perform IRADLs improved postoperatively, objective IR also increased (P < .001). In contrast, when subjective IRADLs worsened postoperatively, objective IR did not significantly worsen for 2 of 4 IRADLs assessed. When examining patients who reported no change in ability to perform IRADLs pre- vs. postoperatively, statistically significant increases in objective IR were found for 3 of 4 IRADLs assessed. CONCLUSIONS Objective improvement in IR parallels improvements in subjective functional gains uniformly. However, in patients with worse or equivalent IR, the ability to perform IRADLs postoperatively does not uniformly correlate with objective IR. When attempting to elucidate how surgeons can ensure patients will have sufficient IR after RSA, future investigations may need to use patient-reported ability to perform IRADLs as the primary outcome measure rather than objective measures of IR.
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Affiliation(s)
- Kevin A Hao
- College of Medicine, University of Florida, Gainesville, FL, USA
| | - Jaquelyn Kakalecik
- Department of Orthopaedic Surgery and Sports Medicine, University of Florida, Gainesville, FL, USA
| | - Robert J Cueto
- College of Medicine, University of Florida, Gainesville, FL, USA
| | - Rachel L Janke
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL, USA
| | - Jonathan O Wright
- Department of Orthopaedic Surgery and Sports Medicine, University of Florida, Gainesville, FL, USA
| | - Thomas W Wright
- Department of Orthopaedic Surgery and Sports Medicine, University of Florida, Gainesville, FL, USA
| | - Kevin W Farmer
- Department of Orthopaedic Surgery and Sports Medicine, University of Florida, Gainesville, FL, USA
| | - Aimee M Struk
- Department of Orthopaedic Surgery and Sports Medicine, University of Florida, Gainesville, FL, USA
| | - Bradley S Schoch
- Department of Orthopaedic Surgery, Mayo Clinic, Jacksonville, FL, USA
| | - Joseph J King
- Department of Orthopaedic Surgery and Sports Medicine, University of Florida, Gainesville, FL, USA.
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Computer-assisted analysis of functional internal rotation after reverse total shoulder arthroplasty: implications for component choice and orientation. J Exp Orthop 2023; 10:23. [PMID: 36917396 PMCID: PMC10014642 DOI: 10.1186/s40634-023-00580-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2022] [Accepted: 01/25/2023] [Indexed: 03/16/2023] Open
Abstract
PURPOSE Functional internal rotation (IR) is a combination of extension and IR. It is clinically often limited after reverse total shoulder arthroplasty (RTSA) either due to loss of extension or IR in extension. It was the purpose of this study to determine the ideal in-vitro combination of glenoid and humeral components to achieve impingement-free functional IR. METHODS RTSA components were virtually implanted into a normal scapula (previously established with a statistical shape model) and into a corresponding humerus using a computer planning program (CASPA). Baseline glenoid configuration consisted of a 28 mm baseplate placed flush with the posteroinferior glenoid rim, a baseplate inclination angle of 96° (relative to the supraspinatus fossa) and a 36 mm standard glenosphere. Baseline humeral configuration consisted of a 12 mm humeral stem, a metaphysis with a neck shaft angle (NSA) of 155° (+ 6 mm medial offset), anatomic torsion of -20° and a symmetric PE inlay (36mmx0mm). Additional configurations with different humeral torsion (-20°, + 10°), NSA (135°, 145°, 155°), baseplate position, diameter, lateralization and inclination were tested. Glenohumeral extension of 5, 10, 20, and 40° was performed first, followed by IR of 20, 40, and 60° with the arm in extension of 40°-the value previously identified as necessary for satisfactory clinical functional IR. The different component combinations were taken through simulated ROM and the impingement volume (mm3) was recorded. Furthermore, the occurrence of impingement was read out in 5° motion increments. RESULTS In all cases where impingement occurred, it occurred between the PE inlay and the posterior glenoid rim. Only in 11 of 36 combinations full functional IR was possible without impingement. Anterosuperior baseplate positioning showed the highest impingement volume with every combination of NSA and torsion. A posteroinferiorly positioned 26 mm baseplate resulting in an additional 2 mm of inferior overhang as well as 6 mm baseplate lateralization offered the best impingement-free functional IR (5/6 combinations without impingement). Low impingement potential resulted from a combination of NSA 135° and + 10° torsion (4/6 combinations without impingement), followed by NSA 135° and -20° torsion (3/6 combinations without impingement) regardless of glenoid setup. CONCLUSION The largest impingement-free functional IRs resulted from combining a posteroinferior baseplate position, a greater inferior glenosphere overhang, 90° of baseplate inclination angle, 6 mm glenosphere lateralization with respect to baseline setup, a lower NSA and antetorsion of the humeral component. Surgeons can employ and combine these implant configurations to achieve and improve functional IR when planning and performing RTSA. LEVEL OF EVIDENCE Basic Science Study, Biomechanics.
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Engelen B, Janssen E, Lambers Heerspink O. The association between reverse total shoulder arthroplasty neck-shaft angle on postoperative patient experienced shoulder disability: a retrospective cohort study. JSES Int 2023; 7:264-269. [PMID: 36911778 PMCID: PMC9998882 DOI: 10.1016/j.jseint.2022.12.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Background The neck-shaft angle (NSA) of the glenoid component used in reverse total shoulder arthroplasty (RTSA) was reduced to improve functional outcomes. This led to a decreased abduction but increased external rotation ability of patients who underwent RTSA. The impact of the decreased NSA on patient-reported shoulder disability is unknown but may have important implications for functional ability. Therefore, the aim of this study was to assess the difference in patient experienced shoulder disability between an NSA of 135° and 155° 12 months after RTSA. Methods In this retrospective cohort study, 109 patients undergoing RTSA were included. In 68 patients, a glenoid component with an NSA of 135° was used and 41 patients received a glenoid component with an NSA of 155°. The primary outcome was Disabilities of the Arm, Shoulder, and Hand (DASH) scores at 12 months and change scores between baseline and 12-month follow-up. Secondary outcomes were complications, Constant Murley Score, Numeric Rating Scale, active forward elevation and external rotation ability. Differences between groups were tested with t-tests or Mann-Whitney U-tests. Results A mean difference of 10.0 in 12 months postoperative DASH scores between NSA groups was observed in favor of the 135° NSA (P = .004), which did not exceed the Minimal Clinically Important Difference. DASH changes scores did not differ between NSA groups (P = .652). Mean postoperative Constant Murley Score at 12 months was 11.1 higher in the 135° NSA group (P = .013). No differences were observed in complications (P = .721) and postoperative pain (P = .710) between groups. Difference in postoperative external rotation and forward elevation at 12 months was 10° (P = .022) and 20° (P = .046), respectively, in favor of the 135° NSA group, exceeding Minimal Clinically Important Differences. Conclusions No clinically important difference in patient-reported shoulder disability (DASH) was found between both groups, despite a larger range of motion in the 135° NSA group. This study is the first to show the impact of NSA on patient-reported shoulder disability using the DASH.
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Affiliation(s)
- Bob Engelen
- Department of Orthopaedic Surgery, VieCuri Medical Centre, Venlo, The Netherlands
| | - Esther Janssen
- Department of Orthopaedic Surgery, VieCuri Medical Centre, Venlo, The Netherlands
- Department of Orthopedics and Research School Caphri, Maastricht University Medical Centre+, Maastricht, The Netherlands
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Lauria M, Hastings M, DiPaola MJ, Duquin TR, Ablove RH. Factors affecting internal rotation following total shoulder arthroplasty. JSES REVIEWS, REPORTS, AND TECHNIQUES 2022; 2:431-436. [PMID: 37588455 PMCID: PMC10426481 DOI: 10.1016/j.xrrt.2022.08.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Abstract
Background Reverse shoulder arthroplasty (RSA) was developed in the late twentieth century to provide a stable arthroplasty option for patients with rotator cuff deficiency arthropathy. Since its inception, there have been changes in materials, design, and positioning. One of the persistent clinical issues has been difficulty with internal rotation (IR) and the associated difficulty with behind the back activities. Implant design, positioning, and the available soft tissues may influence IR after RSA. The purpose of this systematic review is to assess factors that impact IR following RSA. Methods The literature search, based on PRISMA guidelines, used 4 databases: Pubmed, Embase, Web of Science, and Cochrane Central Register of Controlled Trials. We included clinical trials that compared different implantation and design modifications and assessed IR. Results Of the 617 articles identified in the initial search, 46 satisfied the inclusion criteria. The articles explored multiple factors of RSA and their effects on IR, including humeral and glenoid components and muscle function and integrity. Among humeral factors affecting rotation, there was a broad consensus that: IR decreases as retroversion increases, humeral neck-shaft angle less than 155° improves IR, lateralized humeral offset does not improve IR, and shallow cups improve IR. Insert thickness was not associated with a reproducible effect. Of the studies evaluating the effect of glenoid components, there was majority agreement that glenosphere lateralization improved IR, and there were mixed results regarding the effects of glenosphere size and tilt. Others included one study in each: glenoid overhang, retroversion, and baseplate. One study found an association between teres minor insufficiency and improved IR, with mixed results in the presence of fatty infiltration in both teres minor and subscapularis. Most studies noted subscapularis repair had no effect on IR. Conclusion Prosthetic variables affecting IR are not widely studied. Based on the existing literature, evidence is conflicting. More research needs to be undertaken to gain a greater understanding regarding which factors can be modified to improve IR in RSA patients.
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Affiliation(s)
- Mychaela Lauria
- University at Buffalo School of Medicine and Biomedical Sciences, Buffalo, NY, USA
| | - Mikaela Hastings
- University at Buffalo School of Medicine and Biomedical Sciences, Buffalo, NY, USA
| | | | - Thomas R. Duquin
- Department of Orthopaedics, University at Buffalo, Buffalo, NY, USA
| | - Robert H. Ablove
- Department of Orthopaedics, University at Buffalo, Buffalo, NY, USA
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Hochreiter B, Wyss S, Gerber C. Extension of the shoulder is essential for functional internal rotation after reverse total shoulder arthroplasty. J Shoulder Elbow Surg 2022; 31:1166-1174. [PMID: 34968695 DOI: 10.1016/j.jse.2021.11.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 11/10/2021] [Accepted: 11/16/2021] [Indexed: 02/01/2023]
Abstract
BACKGROUND Disabling loss of functional internal rotation (fIR) after reverse total shoulder arthroplasty (RTSA) is frequent but not well understood. This study tested the hypothesis that limitation of fIR after RTSA is not primarily related to a deficit in internal rotation. METHODS Fifty patients (mean age at RTSA, 74 ± 11.7 years) who were consecutively seen at a yearly follow-up visit at 1-10 years (median, 4 years) after RTSA were prospectively examined with special attention to fIR. Patients with axillary nerve or deltoid dysfunction were excluded. Relative (age- and sex-adjusted) Constant-Murley scores (CSs) and Subjective Shoulder Values were assessed preoperatively and at final follow-up. In addition, active extension and 4 postoperative activities of daily living (ADLs) requiring fIR were tested at follow-up. Rotator cuff fatty infiltration and notching were evaluated radiographically. For analysis, patients were divided into a group with poor fIR (fIR-, n = 19), defined as ≤2 internal-rotation points in the CS, and a group with good fIR (fIR+, n = 31), defined as ≥4 internal-rotation points in the CS. RESULTS Active extension of the contralateral shoulders was comparable in the fIR- group (mean, 60.3° [standard deviation (SD), 11.2°]) and fIR+ group (66.1° [SD, 14.2°]). Postoperatively, a difference in active extension between the unaffected and operated sides was present in both groups and averaged 16° (55° [SD, 14.3°] in fIR+ group and 39.1° [SD, 10.8°] in fIR- group; P < .001). No patient in the fIR+ group had active extension < 40° (range, 40°-85°). Shoulders with extension ≥ 40° but unsatisfactory fIR had restricted passive internal rotation in extension. The ability to perform ADLs behind the back correlated better with shoulder extension than with so-called fIR measurements in the CS. CONCLUSION Functional internal rotation after RTSA requires at least 40° of shoulder extension. If fIR is unsatisfactory despite 40° of extension, passive restriction of internal rotation in full extension is the limiting factor. It is crucial to preserve or restore active shoulder extension to allow ADLs involving internal rotation.
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Affiliation(s)
- Bettina Hochreiter
- Department of Orthopedics, Balgrist University Hospital, University of Zürich, Zürich, Switzerland.
| | - Sabine Wyss
- Department of Orthopedics, Balgrist University Hospital, University of Zürich, Zürich, Switzerland
| | - Christian Gerber
- Department of Orthopedics, Balgrist University Hospital, University of Zürich, Zürich, Switzerland
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Southard EJ, Ode G, Simon P, Christmas KN, Pamic D, Collin P, Mighell MA, Frankle MA. Comparing patient-reported outcome measures and physical examination for internal rotation in patients undergoing reverse shoulder arthroplasty: does surgery alter patients' perception of function? J Shoulder Elbow Surg 2021; 30:S100-S108. [PMID: 33600899 DOI: 10.1016/j.jse.2021.01.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 12/31/2020] [Accepted: 01/10/2021] [Indexed: 02/01/2023]
Abstract
BACKGROUND The purpose of this study was to evaluate how patients treated with reverse shoulder arthroplasty (RSA) achieve internal rotation (IR) using video assessment and to compare this to patient-reported outcome measures (PROMs). METHODS We reviewed 215 preoperative and 657 postoperative videos (3-78 months) for 215 patients who underwent primary RSA, performing IR using the modified vertebral level method. Their functional motion pattern was then grouped into 3 types: type I, could not reach behind their back; type II, able to reach to at least waist level, with assistance; and type III, able to reach to a minimum of waist level in an uninterrupted fashion. Patients completed functional questions (put on a coat, wash back, tuck in a shirt, and manage toileting) and a diagram of perceived IR. Patients' functional motion types were compared to PROM answers. Pre- and postoperative scores were also compared to assess the effect of surgery on patients' perception of IR function. RESULTS Patients undergoing RSA will achieve IR in 3 distinct motion patterns. Analysis of self-reported IR indicated statistically significant difference between the 3 functional types of IR (P < .001). Patient-perceived IR was not significantly different between the 3 studied IR functional types (P = .076) in the analysis of preoperative measures but was significantly different in the postoperative setting (P < .001). CONCLUSION Patients attempt IR in 3 distinct functional motion patterns. The improvement of IR after RSA is measured better by patient questionnaires than by physical examination.
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Affiliation(s)
| | - Gabriella Ode
- Department of Orthopaedics, Prisma Health-Upstate, Greenville, SC, USA
| | - Peter Simon
- Foundation for Orthopaedic Research and Education, Translational Research, Tampa, FL, USA; Department of Medical Engineering, College of Engineering and Morsani College of Medicine, University of South Florida, Tampa, FL, USA
| | - Kaitlyn N Christmas
- Foundation for Orthopaedic Research and Education, Translational Research, Tampa, FL, USA
| | - Damir Pamic
- Department of Chemical and Bioengineering, College of Engineering, University of South Florida, Tampa, FL, USA
| | - Philippe Collin
- CHP Ste. Gregoire/Institut Locomoteur de l'Ouest, Rennes, France
| | - Mark A Mighell
- Shoulder Service, Florida Orthopaedic Institute, Tampa, FL, USA; Department of Orthopedics and Sports Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL, USA
| | - Mark A Frankle
- Shoulder Service, Florida Orthopaedic Institute, Tampa, FL, USA; Department of Orthopedics and Sports Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL, USA.
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Hochreiter B, Hasler A, Hasler J, Kriechling P, Borbas P, Gerber C. Factors influencing functional internal rotation after reverse total shoulder arthroplasty. JSES Int 2021; 5:679-687. [PMID: 34223415 PMCID: PMC8245997 DOI: 10.1016/j.jseint.2021.03.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Background Functional internal rotation (fIR) of the shoulder is frequently limited after reverse shoulder arthroplasty (RTSA). The objective of this study was to study a cohort of satisfied patients after RTSA who had comparable active mobility except for fIR and to identify factors associated with selective loss of fIR. Methods A retrospective cohort study was conducted to compare 2 patient groups with either poor (≤ 2 points in the Constant-Murley score [CS]) or excellent (≥8 points in CS) fIR after RTSA at a minimum follow-up of 2 years. Influencing factors (demographic, surgical or implant related, radiographic parameters) and clinical outcome were analyzed. Results Fifty-two patients with a mean age of 72.8 (±9.3) and a mean follow-up of 41 months were included in the IR≤2 group and 63 patients with a mean age of 72.1 (±8.0) and a mean follow-up of 59 months in the IR≥8 group. All patients had undergone RTSA with the same implant type and only 2 different glenosphere sizes (36 and 40) for comparable indications. A multivariate analysis identified the following significant risk factors for poor postoperative fIR: poor preoperative fIR (pts in CS: 3 [range: 2-6] vs. 6 [range: 4-8], P<.0001), smoking (17.3% vs. 6.5%, P = .004), male gender (59.6% vs. 31.7%, P = .002), less preoperative to postoperative distalization of the greater tuberosity (Δ 19.4 mm vs. 22.2 mm, P = .026), a thin humeral insert (≤3 mm: 23.1% vs. 54.8%, P = .039), and a high American Society of Anesthesiologists score (≤ III: 30.8% vs. 14.3%, P = .043). Subscapularis repair status and glenosphere size had no influence on fIR. Clinical outcome scores improved in both groups from preoperatively to last follow-up. The IR≥8 group had overall significantly better outcome scores compared to the IR≤2 group (Δ 9.3% SSV and Δ 9.5% relative CS, P < .0001). There was no difference in CS between the cohorts when the score for fIR was discarded. Conclusion Independent risk factors for poor postoperative fIR after RTSA are poor preoperative fIR, smoking, male gender, less preoperative to postoperative distalization of the greater tuberosity, a thin humeral insert height, and a high American Society of Anesthesiologists score. Except for male gender, these factors are modifiable. These findings may be a valuable addition to patient counselling as well as preoperative planning and preoperative and intraoperative decision-making. The relevance of fIR for overall satisfaction is substantiated by this study.
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Affiliation(s)
- Bettina Hochreiter
- Department of Orthopaedics, Balgrist University Hospital, University of Zürich, Zürich, Switzerland
| | - Anita Hasler
- Department of Orthopaedics, Balgrist University Hospital, University of Zürich, Zürich, Switzerland
| | - Julian Hasler
- Department of Orthopaedics, Balgrist University Hospital, University of Zürich, Zürich, Switzerland
| | - Philipp Kriechling
- Department of Orthopaedics, Balgrist University Hospital, University of Zürich, Zürich, Switzerland
| | - Paul Borbas
- Department of Orthopaedics, Balgrist University Hospital, University of Zürich, Zürich, Switzerland
| | - Christian Gerber
- Department of Orthopaedics, Balgrist University Hospital, University of Zürich, Zürich, Switzerland
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