November 20, 2019
Today’s Top Story

Study: Does Periprosthetic BMD of the Proximal Tibia Affect Migration of the Tibial Component of Cemented Medial UKA?

A study published online in The Journal of Arthroplasty observed that preoperative systemic bone mineral density (BMD) and postoperative change in periprosthetic BMD did not significantly impact migration of cemented medial tibial unicompartmental knee arthroplasty (UKA). Patients were stratified into normal (n = 37) and low (n = 28) BMD groups, per World Health Organization criteria. Dual X-ray absorptiometry scans and stereoradiographs were used to determine BMD of the proximal tibia and migration of tibial component. Compared to those with low BMD, normal systemic BMD patients had an 11 percent to 15 percent higher BMD in all regions of interest (ROI). In both groups, periprosthetic BMD in ROIs one to three decreased. BMD reduction was similar in both knees in all ROIs over a two-year period. Between 12 and 24 months, the normal and low BMD groups had similar migrations (0.03 mm versus 0.02 mm). Change in periprosthetic BMD did not affect migration over time.

Read the abstract…

In Other News

Study Examines Relationship Between Anatomical Pelvic Parameters and Functional Parameters of the Spine and Pelvis

A study published online in the Journal of Orthopaedic Surgery and Research analyzed the association between functional parameters of the pelvis and spine and morphological parameters of the pelvis and acetabulum. This study included 84 female patients with bilateral hip developmental dysplasia treated with curved periacetabular osteotomy. Patients underwent standing radiographs of the thoracic to lumbar spines and pelvis. A preoperative three-dimensional pelvic model reconstructed from CT images evaluated the anterior center-edge (CE) angle, posterior CE angle, lateral CE angle, and acetabular anteversion (AA). In terms of pelvic incidence correlating with other parameters, the sacral slope (SS) value was the highest of the functional parameters, and the anatomical-SS value was the highest of the morphological parameters. Moderate correlations were observed between the anterior pelvic plane angle (APPA) and pelvic tilt (PT) and anatomical-PT. There was a moderate association between anatomical-PT and acetabular anteversion. Moderate correlations were observed between APPA and the anterior CE angle, posterior CE angle, and AA. APPA was more strongly correlated with anatomical-PT than AA.

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Study Evaluates Hemiepiphysiodesis in Hallux Valgus Deformity

A study published online in BMC Musculoskeletal Disorders evaluated the efficacy of percutaneous hemiepiphysiodesis in the gradual correction of symptomatic juvenile hallux valgus deformity. The study included 21 patients (37 feet; mean age at surgery, 12 years) with symptomatic juvenile hallux valgus treated with combination percutaneous medial drilling hemiepiphysiodesis of the first proximal phalanx and lateral transphyseal screw hemiepiphysiodesis of the first metatarsal. Patients underwent pre- and postoperative feet radiographs for measurements of hallux vagus angle (HVA), intermetatarsal angle (IMA), proximal metatarsal articular angle (PMAA), proximal phalangeal articular angle (PPAA), and metatarsal length ratio (MTLR). Patients were followed for a mean 35.1 months after surgery. Mean HVA reduction was 4.7 degrees, and IMA reduction was 2.2 degrees. PMAA and PPAA significantly improved in the anteroposterior plane, but PMAA in the lateral plane did not significantly change. Mean MTLR difference was zero, suggesting no length discrepancy between the first and second metatarsals. The American Orthopaedic Foot & Ankle Society score increased from 68.7 to 85.2.

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Study: Long-term Survival of Cemented Exeter Universal Stem in Young Patients

A study published online in The Journal of Arthroplasty observed favorable 20-year outcomes of the Exeter cemented hip system in total hip arthroplasty (THA) patients aged 50 years and younger. The study included clinical and radiological outcomes of 130 consecutive THAs performed in 107 patients (mean age at surgery, 41.8 years) who were followed at five-year intervals. No patients were lost to follow-up, and patients were followed for a mean 22 years. In total, 79 hips survived, and 37 hips were revised, primarily due to aseptic cup loosening (n = 29 hips); 11 patients (n = 14 hips) were deceased. No cases of aseptic loosening of the Exeter stem or radiologically loose stems were reported; however, eight patients presented radiological evidence of cemented cup loosening. At 22 years, survivorship for all-cause revision was 74.9 percent, and survivorship was 96.3 percent for revision of the stem for aseptic loosening or lysis.

Read the abstract…

Orthopaedic Implant Market Forecasted to Grow by 2026

A report from Fortune Business Insights predicted that the orthopaedic implant market will grow from $46.5 billion in 2018 to $64.0 billion in 2026, representing a 4.1 percent increase. This predicted increase is attributed to the rise in osteoporosis diseases that increase the risk of fractures, as well as the growing geriatric population.

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100-Plus Cosponsors Support Bipartisan Legislation on Surprise Medical Billing

Congress has spent the better part of this year trying to solve the problem of unexpected medical bills for out-of-network care. AAOS-supported legislation achieved an important milestone in mid-October when it surpassed 100 cosponsors in the House of Representatives. The bill, called the Protecting People from Surprise Medical Bills Act (H.R. 3502), closely mirrors the successful model that is in place in the state of New York and has received wide support from the physician community.

Read more…


Apply for Volunteer Opportunities

Consider applying for the following positions:

  • Basic Science Content Committee chair designee position—applications are accepted until Dec. 10
  • Hip & Knee Content Committee vice chair position—applications are accepted until Dec. 10
  • Pediatrics Content Committee member position—applications are accepted until Dec. 10
  • Spine Content Committee member position—applications are accepted until Dec. 10
  • Sports Medicine Content Committee member position—applications are accepted until Dec. 10
  • Committee On Devices, Biologics, and Technology chair position—applications are accepted until Dec. 27

Learn more and submit applications…(member login required)


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