Patient-specific instrumentation (PSI) in total knee arthroplasty (TKA) aims to improve implant alignment and clinical outcomes, but its effectiveness remains uncertain. We aimed to compare whether PSI was superior to conventional instrumentation (CVI) in TKA. The primary outcome was the Oxford Knee Score (OKS) at 2 years with assessments of additional clinical outcomes up to 5 years after surgery.

is missing (Erratum) This Erratum relates to the following article: https://doi.org/10.2340/17453674.2025.42999.

 Anatomic total shoulder arthroplasty (aTSA) is an effective treatment for glenohumeral osteoarthritis, but loosening of the glenoid component is a common cause for revision. Our primary aim was to analyze migration of a hybrid glenoid component in aTSA using marker-based radiostereometric analysis (RSA). Second, we aimed to compare early migration with later revision.

 Deformity correction with pedicle screw instrumentation in adolescent idiopathic scoliosis has been shown to improve the health-related quality of life (HRQoL), while evidence on syndromic scoliosis is limited. Syndromic patients tend to have comorbidities resulting in a higher risk of perioperative complications. We aimed to assess the change in HRQoL in patients with syndromic scoliosis compared with adolescent idiopathic scoliosis after spinal fusion with pedicle screw instrumentation.

 An important aspect of orthopedic residency is to gain experience and perform total joint arthroplasties to learn operating skills. For patients, a substantial concern is that resident involvement may result in more adverse events. We performed a systematic review with meta-analysis to evaluate whether resident involvement is associated with a higher complication rate in total hip and knee arthroplasty compared with procedures performed by orthopedic surgeons.

 Our aim was to study the association between chronic preoperative opioid use and 1-year revision rate, mortality, and patient-reported outcomes (PROs) after primary total knee and hip arthroplasty (TKA/THA). We also investigated whether age, sex, or BMI modified these associations.

 To address the limitations of radiostereometric imaging and to eliminate the need for intraoperative marker placement, CT-based radiostereometric analysis (CT-RSA) software systems have been developed. We aimed to evaluate the precision of a novel CT-RSA software system, V3MA, against an established CT-RSA software system, CTMA, while also examining the impact of CT scanner model on precision.

 There is limited data on the functional outcome after hallux valgus (HV) surgery. Our study aims to assess 1-year postoperative patient-reported outcomes (PROMs) after a chevron osteotomy (CO) for 3 severity levels, the number of additional surgical interventions during the index procedure, and the association between the presence or absence of internal fixation and PROMs.

Cemented fixation is widely recommended during arthroplasty for hip fractures, yet it has not been universally adopted by all surgeons and hospitals. We aimed to identify which factors were associated with a higher likelihood of cemented fixation.

 Previous studies show no clear difference in functional outcomes between locking nails and plates for proximal humerus fractures (PHFs). Economic evaluations provide valuable insights into cost-effectiveness to guide healthcare decisions. We aimed to conduct a cost-effectiveness analysis based on a semidouble-blinded randomized controlled trial comparing nailing and plating for displaced 3- and 4-part PHFs with 2-year follow-up.

 There is a controversy as to whether operating rooms with laminar airflow (LAF) ventilation are less associated with prosthetic joint infection (PJI) following total hip arthroplasty (THA) than turbulent airflow (TAF) ventilation. We aimed to assess the association of LAF and TAF ventilation with PJI following primary THA.

 Increased use of weightbearing radiographs to assess ankle mortise stability have suggested that most lateral malleolar fractures with a congruent mortise on initial radiographs can successfully be treated nonoperatively. We aimed to evaluate trends in the surgical management of isolated lateral malleolus fractures across Austria, England, Finland, Germany, Sweden, and Switzerland from 2013 to 2022 Methods: We performed a multi-register study to document the annual incidence of operative treatment for isolated lateral malleolus fractures through procedure codes across 6 European countries between 2013 and 2022. The annual incidence of operative treatment was calculated by dividing the total number of procedures per year by the year- and age-matched population based on publicly available demographics data.

The goal of this Acta Orthopaedica educational article is to provide an update on how to evaluate lateral malleolar ankle fractures at the level of the syndesmosis and to guide clinicians in selecting the most appropriate treatment method. We aim to clarify the indications for non-surgical treatment and to provide clinicians with an evidence-based approach to decision-making in these frequently encountered injuries. The authors introduce the concept of "congruent on weightbearing" in contrast to the historical thinking of ankle fractures as stable or unstable. We further elaborate on how this thinking should be the basis in the decision-making regarding treatment method to safely differentiate fractures that will heal uneventfully without surgical intervention from those that need internal reduction and stabilization. As long as crucial parts of the deltoid ligament are intact, lateral malleolar ankle fractures at the level of the syndesmosis maintain, or regain, joint congruency under weightbearing. Ankle fractures that stay congruent under weightbearing often heal uneventfully and can be safely treated without surgery. Furthermore, research has shown that early weightbearing and short immobilization periods are beneficial for patient recovery without an increase in complication rates.

Concurrent benzodiazepine-opioid use is discouraged. We aimed to examine trajectories of benzodiazepine, opioid, and concurrent use following hip and knee arthroplasties for osteoarthritis (HA-OA, KA) and hip arthroplasty for fracture (HA-fracture).

 Limited population-based data is available concerning traumatic joint dislocations in children and adolescents. We aimed to determine the incidence, typical locations, and demographic patterns of joint dislocations in a pediatric population.

 Patients treated with shoulder arthroplasty may risk serious adverse events (SAEs), readmission, and death; however, the literature is inconsistent. Therefore, we aimed to compare the incidence rates of SAEs, readmissions, and mortality at 30 and 90 days following shoulder replacement with those of a matched cohort.

 Reliable assessment of fracture healing remains a clinical challenge as radiographs and clinical examination provide only indirect information. Inducible fracture micromotion, defined as fragment displacement under load, may offer a more direct surrogate for healing. Radiostereometric analysis (RSA) can measure micromotion with high precision, but its clinical use for fracture assessment remains limited and heterogeneous. This scoping review aimed to map the existing literature on RSA for inducible fracture micromotion and summarize methodological approaches to guide future research.

 Continued opioid use persists in up to one-third of patients 12 months after total hip arthroplasty (THA). Psychological factors, including stress, may influence pain and therefore opioid consumption, yet the effect of stress history on opioid use after THA remains unclear. We aimed to examine the association between perceived stress and the risk of continued opioid use following THA in patients with osteoarthritis.

 Contemporary data on the risk of chronic pain after total knee arthroplasty (TKA) and unicompartmental knee arthroplasty (UKA) is limited. Therefore, we aimed to investigate the incidence of chronic pain, pain characteristics, patterns of analgesic use, patient satisfaction, and willingness to undergo the same surgery again, 1 year after primary TKA and UKA for osteoarthritis.