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Fulltext A Comparison of the Incidence Rate for Joint Bleeding and FVIII Consumption between On-Demand versus Prophylaxis Factor VIII Replacement Therapy and the Direct Cost of Prophylaxis Treatment in Severe Haemophilia A Patients

Jamal M, Sathar J, Jamari J, Mohd Saffian S

Malays J Med Sci, 2023 Feb;30(1):129-136.
PMID: 36875203 DOI: 10.21315/mjms2023.30.1.11

BACKGROUND: Haemophilia A is a bleeding disorder caused by inadequate clotting factor VIII (FVIII). There are two main modes of treatment approach in severe haemophilia A patients either with on-demand or prophylaxis therapy with clotting factor FVIII concentrates. In this study, a comparison was made between the bleeding incidence rate of the on-demand and prophylaxis group in severe haemophilia A patients at Ampang Hospital, Malaysia.
METHODS: A retrospective study involving patients with severe haemophilia was conducted. The patient's self-reported bleeding frequency was retrieved from the patient's treatment folder from January to December 2019.
RESULTS: Fourteen patients received on-demand therapy, while the other 24 patients received prophylaxis treatment. The total number of joint bleeds in the prophylaxis group was significantly lower compared to the on-demand group (2.79 bleeds versus 21.36 bleeds [P < 0.001]). Furthermore, the total annual usage of FVIII was higher in the prophylaxis group compared to the on-demand group (1,506 IU/kg/year [± 905.98] versus 365.26 IU/kg/year [± 223.90], P = 0.001).
CONCLUSION: Prophylaxis FVIII therapy is an effective treatment in reducing the frequency of bleeding joints. However, this treatment approach is associated with high cost due to the high consumption of FVIII.
Fulltext The Effect of Bottom Profile Dimples on the Femoral Head on Wear in Metal-on-Metal Total Hip Arthroplasty

Jamari J, Ammarullah MI, Saad APM, Syahrom A, Uddin M, van der Heide E, et al.

J Funct Biomater, 2021 Jun 06;12(2).
PMID: 34204138 DOI: 10.3390/jfb12020038

Wear and wear-induced debris is a significant factor in causing failure in implants. Reducing contact pressure by using a textured surface between the femoral head and acetabular cup is crucial to improving the implant's life. This study presented the effect of surface texturing as dimples on the wear evolution of total hip arthroplasty. It was implemented by developing finite element analysis from the prediction model without dimples and with bottom profile dimples of flat, drill, and ball types. Simulations were carried out by performing 3D physiological loading of the hip joint under normal walking conditions. A geometry update was initiated based on the patient's daily routine activities. Our results showed that the addition of dimples reduced contact pressure and wear. The bottom profile dimples of the ball type had the best ability to reduce wear relative to the other types, reducing cumulative linear wear by 24.3% and cumulative volumetric wear by 31% compared to no dimples. The findings demonstrated that surface texturing with appropriate dimple bottom geometry on a bearing surface is able to extend the lifetime of hip implants.
Fulltext Understanding Hip Contact Stress Based on Types of Physical Activity: A Systematic Review

Prasetya AIP, Ammarullah MI, Winarni TI, Pramono A, Jamari J, Kamarul T, et al.

Health Sci Rep, 2025 Jan;8(1):e70305.
PMID: 39846047 DOI: 10.1002/hsr2.70305

BACKGROUND AND AIMS: High contact stresses involving the hip have been shown to increase the risk of developing hip osteoarthritis (OA). Although several risk factors have been identified for OA, a holistic approach to predicting contributed factors toward increased hip contact stresses have not been explored. This study was conducted to comprehensively understand the effects of physical activity on high hip contact stress as predisposing factors of OA.
METHODS: The protocol of this systematic review was registered in PROSPERO with registration number CRD42022296638 and conducted based on PRISMA guidelines. Full articles that matched our inclusion criteria were selected using PubMed, Web of Science, and Scopus search engines and keywords such as "hip contact stress," "hip contact force," and/or "hip contact pressure." Category of factors, experimental design, results of the study, and evidence from each article were analyzed.
RESULTS: In total 7972 papers were screened, identified, and reviewed. Two independent authors read the collected fulltext of eligible articles resulting in 21 papers that fulfilled the inclusion criteria of this systematic review.
CONCLUSION: Types of physical activity (n = 21) have correlation with high hip joint contact stress in various manner. Based on the research findings obtained from various inclusion papers, it can be broadly concluded that the more intense the physical activity, such as running and stair climbing, the greater the impact on the increase in hip contact stress values. However, the reviewed studies vary in their methods. This finding suggested that this area is not well investigated and warrants future research.

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