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Today's shoulder and elbow edition explores critical decision-making and diagnostic challenges across the spectrum from adult arthroplasty to pediatric trauma. We examine how surgeons choose between reverse and total shoulder arthroplasty in cuff-intact osteoarthritis, factors affecting coracoid graft survival after Latarjet procedures, technical considerations for preventing stem subsidence in reverse shoulder arthroplasty, and systematic diagnostic pitfalls in pediatric elbow fractures.
OrthoDigest is a fully AI-generated daily podcast by Joint Venture Orthopaedics — from automated research discovery and manuscript selection to script writing, voice production, and multilingual translation. Every step of the pipeline is powered by artificial intelligence, making it one of the first fully autonomous medical podcasts. Each episode covers six open-access, peer-reviewed manuscripts on a rotating subspecialty schedule — hip, knee, shoulder & elbow, hand & wrist, foot & ankle, spine, trauma, sports medicine, pediatrics, and oncology. Every study discussed is freely available, with links in the episode notes. Whether you're a surgeon, resident, researcher, or allied health professional, OrthoDigest keeps you current in about 20 minutes a day.
Welcome to OrthoDigest, your daily podcast of orthopaedic literature summaries, brought to you by Joint Venture Orthopaedics. Today is Wednesday, so we are covering shoulder and elbow. We have four open-access studies for you today, spanning surgeon decision-making in shoulder arthroplasty, coracoid graft complications after Latarjet procedures, reverse shoulder stem subsidence, and pediatric elbow fracture misdiagnosis. As always, links to every manuscript are in the episode description — all are open access. Let's get started.
Our first study is a qualitative study by O'Malley and colleagues, published in Bone and Joint Open. This research tackles one of the most contentious debates in shoulder arthroplasty: when do you choose reverse shoulder arthroplasty versus total shoulder arthroplasty in patients with glenohumeral osteoarthritis and an intact rotator cuff?
The authors used grounded-theory methodology with semistructured interviews to understand how surgeons make this critical decision. They interviewed ten consultant trauma and orthopaedic surgeons specializing in shoulder and elbow who completed at least twelve primary shoulder arthroplasties per year. The interviews were conducted between April and July two thousand twenty-five, and data saturation was reached following ten interviews. The participating surgeons had a mean age of forty-five years and averaged eight years in consultant practice, with mean caseloads of thirty-two arthroplasty cases per year.
The findings reveal fascinating patterns in surgical decision-making. Nine out of ten participants reported practices that were predominantly reverse shoulder arthroplasty, ranging from seventy to ninety-five percent of their caseload, while only one participant reported a majority total shoulder arthroplasty practice at sixty-six percent. Five distinct themes emerged during the interviews: patient characteristics, anatomy and physiology, outcomes, surgeon factors, and implant factors. Many participants expressed a "one operation" concept, describing an aversion to performing revisions in these patients and believing that reverse shoulder arthroplasty had a better revision profile.
So what can you do differently? These findings emphasize that implant selection is not standardized and involves complex decision-making beyond clinical data alone. The main factors surgeons actively balance are physiological age, patient anatomy, and anticipated functional outcomes. However, the lack of uniform agreement on optimal implant choice for specific patient profiles suggests you should consider developing more systematic approaches to this decision. The data suggests considering patient age, bone quality, activity demands, and revision risk when counseling patients about these options.
The authors note several limitations. Although their sampling strategy was designed to capture a representative group of trauma and orthopaedic surgeons practicing in England, the resulting sample reflects the current sex imbalance within the profession and is restricted to a single national context. The research team was predominantly composed of practicing orthopaedic surgeons, which while supporting rapport and understanding, carries the risk of reinforcing shared assumptions.
Shifting to anterior shoulder instability, our next study is a systematic review by Harrell and colleagues, published in Shoulder and Elbow, examining predictors of coracoid graft osteolysis after the Latarjet procedure.
The authors conducted a systematic review following PRISMA guidelines, querying Medline, Embase, and Cochrane databases for studies reporting postoperative graft osteolysis assessed by CT after the Latarjet procedure. They identified studies including nine hundred sixty-three patients across fifteen studies who underwent the Latarjet procedure for recurrent anterior glenohumeral instability. The cohort was eighty-five and a half percent male with an average age range of twenty-three point two to thirty-three years. The dominant arm was operated in sixty-seven point two percent of procedures, with follow-up ranging from three to one hundred two months.
The key findings reveal important technical factors affecting graft survival. Open Latarjet was associated with increased rates of graft osteolysis in three of four studies, involving two hundred fourteen of two hundred sixty-two patients. Conversely, there was an inverse relationship between preoperative glenoid bone loss and graft osteolysis in three of six studies involving two hundred fifty-six of three hundred eighty-two patients. Interestingly, graft position factors including inferior or superior screw angles, positioning, and placement in sagittal or axial planes showed no significant effects on osteolysis. Suspensory fixation compared to screw fixation also showed no significant differences in two studies.
Perhaps most clinically relevant, the impact of osteolysis on patient outcomes was minimal. Only one of six studies found lower Walch-Duplay scores and recurrent instability with osteolysis, while all other studies found no relationships between graft osteolysis and patient-reported outcome measures, range of motion, or strength.
So what can you do differently? This data suggests considering arthroscopic technique over open approach when technically feasible, as the arthroscopic group showed significantly less graft osteolysis. The inverse relationship between preoperative bone loss and osteolysis supports the concept that increased mechanical demand on the graft leads to better remodeling according to Wolff's Law. Most importantly, since graft osteolysis demonstrates no significant impact on functional outcomes, routine CT scans to assess graft integrity may not be necessary for resource allocation and patient safety considerations. Consider utilizing CT scans only after recurrent instability or clinical deterioration.
The authors acknowledge the largest limitation is heterogeneity of included retrospective studies with small sample sizes, which limited comparative statistics and reduced generalizability. They also note lack of control for confounding variables and inter-observer reliability issues in assessing osteolysis.
Staying with shoulder arthroplasty, our third study is a retrospective study by Nishiura and colleagues, published in Archives of Orthopaedic and Trauma Surgery, examining stem subsidence following reverse shoulder arthroplasty using short press-fit stems.
The authors analyzed one hundred fifty-one patients who underwent reverse shoulder arthroplasty at a single center between two thousand seventeen and two thousand twenty-three. They assessed subsidence on anteroposterior radiographs by measuring the vertical distance from the apex of the greater tuberosity to the distal stem tip. Filling ratios were evaluated at metaphyseal and diaphyseal levels, and risk factors were analyzed using logistic regression. The average patient age was seventy-five point six years.
The prevalence of significant stem subsidence was concerning. Subsidence greater than or equal to five millimeters was observed in twenty cases, representing thirteen point two percent of the cohort. The mean subsidence overall was one point two millimeters. Two key risk factors emerged from the analysis: metaphyseal filling ratio and osteoporosis. The metaphyseal filling ratio showed an odds ratio of zero point nine with a ninety-five percent confidence interval of zero point eight two to zero point nine nine and a p-value of zero point zero three. Osteoporosis demonstrated an odds ratio of three point two with a ninety-five percent confidence interval of one point zero five to nine point nine six and a p-value of zero point zero four.
The filling ratio analysis revealed critical technical insights. Mean metaphyseal filling ratio was seventy-one percent, and patients with metaphyseal filling ratio less than seventy percent were significantly associated with subsidence. In the subsidence group, metaphyseal filling ratio averaged sixty-seven point seven percent compared to seventy-one point five percent in patients without significant subsidence.
So what can you do differently? The data clearly indicates surgeons should aim for a metaphyseal filling ratio of at least seventy percent to mitigate subsidence risk. This requires careful attention to stem sizing and placement during surgery. For patients with poor bone quality or osteoporosis, consider cemented stems as they may provide more reliable fixation than press-fit stems. The three-fold increased risk in osteoporotic patients suggests bone density assessment should influence your fixation strategy.
The authors note several limitations of this retrospective single-stem design study. The sample size was small, radiographic assessment relied solely on anteroposterior images, bone mineral density values were not available so osteoporosis detection may have been inaccurate, and long-term outcomes remain unclear. They also note the findings may not apply to recent in-lay type stems.
Our final study shifts to pediatric elbow trauma with a single-center retrospective review by Zhang and colleagues, published in Children, examining diagnostic pitfalls in transphyseal fractures of the distal humerus.
The authors reviewed twenty-five cases of transphyseal fractures of the distal humerus that were initially misdiagnosed between January two thousand twelve and December two thousand twenty-two. These children had a mean age of twenty-seven months, ranging from eleven to fifty-six months. The most common injury mechanism was ground-level falls in sixteen of twenty-five cases, representing sixty-four percent. Using the modified DeLee classification, type A occurred in two cases, type B in sixteen cases at sixty-four percent, and type C in seven cases at twenty-eight percent.
The diagnostic challenges were substantial and systematic. None of the twenty-five cases were correctly identified as transphyseal fractures at initial presentation, representing a one hundred percent initial misdiagnosis rate among this cohort of misdiagnosed cases. The authors note this represents twenty-five out of sixty-three total transphyseal fracture cases seen during the study period, indicating a forty point three percent overall misdiagnosis rate. The leading sources of misclassification were overlooking global forearm-humerus alignment in thirty-six percent, misinterpretation of the radiocapitellar line in thirty-two percent, and misreading metaphyseal fragments as evidence of supracondylar fractures in twenty-four percent.
Treatment outcomes varied by approach. Closed reduction with percutaneous pinning was performed in eighteen of twenty-five cases, while closed reduction with casting was used in seven cases. Cubitus varus developed in five patients overall, representing twenty percent of cases. This complication occurred in three of seven closed reduction with casting cases at forty-two point nine percent compared to two of eighteen percutaneous pinning cases at eleven point one percent. Despite these complications, functional outcomes by Mayo Elbow Performance Index showed twenty-three of twenty-five patients graded as excellent.
So what can you do differently? This data suggests implementing systematic diagnostic protocols for pediatric elbow injuries. The authors recommend that transphyseal fractures be considered a mandatory differential diagnosis in all children under three years of age presenting with elbow injuries in the emergency department. Consider implementing a structured radiographic assessment focusing on global forearm-humerus alignment and radiocapitellar line evaluation. The improved outcomes with percutaneous pinning suggest this should be the preferred treatment when surgical management is indicated. The authors also recommend initial evaluation by a senior pediatric orthopaedic surgeon with mandatory child protection team notification in suspected non-accidental injury cases.
The authors acknowledge limitations of their retrospective single-center design with modest sample size limiting statistical power for subgroup analyses. They note that physician-related diagnostic factors like fatigue and workload were not assessed, and the role of adjunct imaging like ultrasound and MRI was not systematically evaluated.
And that wraps up today's edition of OrthoDigest. We covered surgeon decision-making in cuff-intact osteoarthritis, coracoid graft osteolysis after Latarjet procedures, stem subsidence in reverse shoulder arthroplasty, and diagnostic challenges in pediatric transphyseal fractures. As always, links to all manuscripts are in the episode description — they are all open access, so please do take a look. Thanks for listening, and we will see you tomorrow for foot and ankle.