Background Although pseudotumors have been reported in 32% of asymptomatic metal-on-metal hips, the natural history of asymptomatic pseudotumors is unknown. Questions/purposes The purpose of this study was to assess changes over time in asymptomatic pseudotumors and the effect of revision on pseudotumor mass. Methods Followup ultrasound was performed a mean of 25.8 months (range, 21-31 months) after the detection of 15 pseudotumors and five isolated fluid collections in a cohort of 20 asymptomatic patients (13 metal-on-metal, three metal-on-polyethylene, and four hip resurfacings) [42]. Changes in pseudotumors and fluid collections size and nature, and serum ion levels were determined.

Background: Recent studies have shown that ovariectomy-induced osteoporosis in rats can be reversed by infusion of osteoblasts cultured from mesenchymal stem cells (MSCs). This study compares the influence of MSCs, osteoblasts, and exosomes derived from osteoblasts for the treatment of osteoporosis. Methods: Osteoporosis was induced in 40 female Sprague Dawley rats by performing ovariectomy. After 12 weeks, bone marrow was harvested and MSCs separated from bone-marrow aspirate as described by Piao et al. After 15 days, autologous osteogenically differentiated cells from the MSCs were available. Exosomes were isolated from osteoblasts by modification of the technique described by Ge et al. MSCs and osteoblasts (10 6 cells in 0.5 mL normal saline) and exosomes (100 µg protein) were injected into the tail veins of the animals. Animals were euthanized after 12 weeks and femurs and lumbar spines dissected and analyzed using high-resolution peripheral quantitative computed tomography. Results: When compared to the control group, osteoblast-treated animals showed significant differences in all parameters compared, with P -values ranging between <0.002 and <0.0001. Comparison among osteoblasts, MSCs, and exosomes, showed that osteoblasts had positive and statistically significant new-bone formation. The comparison for the spine was similar to the distal femur for osteoblasts. Conclusion: This study showed robust positive bone-forming changes after osteoblast injection in the distal femur and the spine when compared to controls, MSCs, and exosomes.

The recommended daily dose of vitamin D is 2000 IU was found to be insufficient in many patients. The objective of the present study is to find whether the daily dose of vitamin D should be based on BMI. Two hundred and thirty patients with an established vitamin D deficiency (serum level of 25 Hydroxy vitamin D3 (25OHD3) of ≤20 ng/ml) and patients with BMI ≥30 kg/m2 were included in the study. Demographic data, comorbidities and BMI were recorded. Pre-treatment and post-treatment serum 25OHD3, calcium, phosphorus and parathyroid hormone (PTH) were tested at 0-, 3- and 6-month periods. Patients were treated with a standard dose of 50 000 IU of vitamin D weekly and 600/1200 mg of calcium a day. Once their level of 25OHD3 reached ≥30 ng/ml, patients were randomised into two groups. Group A received a standard recommended maintenance dose of 2000 IU daily and Group B patients received 125 IU/kg/m2 of vitamin D3. The data were entered in the database and analysed. The mean age of Group A was 50⋅74 ± 7⋅64 years compared to 52⋅32 ± 7⋅21 years in Group B. In both groups, pre-treatment vitamin D level was ≤15 ng/ml and increased to 34⋅6 ± 2⋅6 and 33⋅7 ± 2⋅4 ng/ml at the end of 3 months treatment with a dose 50 000 IU of vitamin D3 and calcium 600/1200 mg once a day for group A and group B, respectively. At 6 months, patients in Group A 25OHD3 level was 22⋅8 ± 3⋅80 and in Group B was 34⋅0 ± 1⋅85 ng/ml (P < 0⋅001). This preliminary study suggests that obese patients need higher dosage of vitamin D than the recommended dose. It is prudent that the dosage should be based on the BMI to maintain normal levels for a healthy musculoskeletal system.

Objectives: The aim of this study was to provide the pattern of orthopedic trauma catered at our center during the lockdown to stop the spread of SARS-CoV-2 and compare it during the same period in the preceding year. Methods: A retrospective study of all trauma patients operated during partial and total lockdown during March– July 2020, was conducted at the orthopedic department of King Fahd Hospital of the University, Al-Khobar. The data collected were age, gender, reason for hospital admission, date of injury and presentation, length of stay, and treatment provided. The exposure and transmission of the COVID-19 to healthy orthopedic staff were recorded. Results: During the lockdown, there were 71 admissions compared to 110 the year before, with a drop of 39 (35.4%) patients. The drop in the number of women and children was statistically significant (P < 0.05 and < 0.001, respectively). The majority of injuries were sustained from domestic accidents and road crashes. There was a significant increase in fractures of the vertebral column and distal radius (P < 0.002 and < 0.05, respectively). In the pre-COVID-19 period, the average time to discharge was 18.90 ± 12.74 days and the average time to discharge in COVID-19 period was 4.28 ± 3.52 days. Four orthopedic staffs were exposed to COVID-19-positive patients and one of the surgeons became positive. Conclusion: The COVID-19 pandemic decreased orthopedic trauma admissions by 35% during the lockdown period and early surgery and discharge of the patients was possible due to proper planning.

Background and Objective. The aim of this study was to compare the effect of autologous bone marrow-derived chondrocytes (ABMDCs) with pharmacological management of osteoarthritis of knee (OAK) and assess the benefit of the two in the improvement of pain relief, functional betterment, and quality of life (QOL). Patients and Methods. A prospective, randomized study was undertaken in patients with OAK grades II and III of Kellgren–Lawrence grading (KLG) in two groups. Group I had 5 million of intra-articular ABMDC in the affected joint, and Group II continued the nonsteroidal anti-inflammatory drugs (NSAIDs) and physical therapy as needed. Before the treatment, patients were meticulously examined and data were entered for age, sex, Body Mass Index (BMI), Visual Analogue Scale (VAS), Modified Knee Society Score-Short Form (MKSSSF), and QOL. Patients were followed up for 3, 12, and 24 months to assess efficacy, safety, and tolerability. To assess the cartilage regeneration of the damaged cartilage, magnetic resonance imaging (MRI) was used. Results. There were a total of 60 patients who were followed up. Three patients in Group II were removed from the analysis as they underwent total knee arthroplasty (TKA). A notably significant improvement was noticed in the ABMDC group on all scores of VAS and MKSSSF with P < 0.0001 . The control group continued to be dissatisfied with the treatment they were taking. Conclusions. This study reveals that a single injection of 5 million of ABMDC was efficient in reducing the symptoms, improving the functional score and betterment of QOL.