Here is a well-crafted introduction for your retrospective study:

Antimicrobial agents occupy a central position in the pharmacological management of patients admitted to orthopedic departments, where they are employed both as prophylactic agents to prevent surgical site infections (SSIs) and as therapeutic agents to treat established bone and soft tissue infections. Orthopedic surgical procedures - ranging from fracture fixation and joint replacement to debridement of osteomyelitis - carry an inherent risk of infection that, if not appropriately managed, can lead to implant failure, prolonged hospitalization, chronic osteomyelitis, limb-threatening complications, and significant economic burden on the healthcare system.

Globally, antimicrobial resistance (AMR) has emerged as one of the most pressing public health challenges of the 21st century. The World Health Organization (WHO) has repeatedly emphasized that the irrational, excessive, and inappropriate use of antimicrobials is the single most important driver of resistance. Orthopedic departments, where broad-spectrum antibiotics are frequently prescribed both perioperatively and postoperatively, are recognized as significant contributors to in-hospital antimicrobial consumption. Studies from multiple countries have documented wide variation in antibiotic use across orthopedic units, with defined daily doses (DDD) per 100 bed days ranging from as low as 22.3 (Shanghai, China) to as high as 173.65 (Turkey), highlighting the absence of uniform prescribing practices.

In India, the situation is particularly concerning. Antimicrobial agents account for over 50% of the value of drugs sold in the country, and their use in clinical settings varies widely, ranging from 24% to 67% of all prescriptions. Studies have documented that up to 64% of prescribed antibiotics in Indian hospitals are either inappropriate or not clinically indicated in terms of drug selection or dosage (Kunin's criteria). The high burden of infectious diseases, wide availability of over-the-counter antibiotics, and heterogeneous prescribing practices across tertiary, secondary, and primary care facilities compound the challenge of rationalizing antibiotic use. Orthopedic departments in Indian tertiary care hospitals represent a high-risk environment for both SSIs - particularly caused by methicillin-resistant Staphylococcus aureus (MRSA), gram-negative bacilli, and polymicrobial organisms - and for the consequent misuse of broad-spectrum agents.

Drug utilization studies (DUS) provide a systematic, evidence-based methodology to evaluate how drugs are prescribed, dispensed, and used within a given healthcare setting. The WHO defines drug utilization as "the marketing, distribution, prescription, and use of drugs in a society, with special emphasis on the resulting medical, social, and economic consequences." When applied to antimicrobials, DUS serve as the cornerstone of antimicrobial stewardship programs (ASPs), enabling institutions to identify gaps between actual prescribing practices and established guidelines, quantify the burden of antibiotic use through indicators such as DDD/100 bed days, and formulate locally tailored interventions to promote rational prescribing.

Despite the recognized importance of antimicrobial stewardship, published data on antimicrobial utilization patterns specific to orthopedic departments in Gujarat and western India remain sparse. Shantabaa Medical College and General Hospital (SMCGH), Amreli, Gujarat, is a government-aided tertiary care teaching institution that caters to a predominantly rural and semi-urban population across the Saurashtra region. The orthopedic department at SMCGH manages a diverse case mix including trauma, elective surgeries, septic arthritis, and osteomyelitis, and therefore represents an ideal setting to examine real-world antibiotic prescribing practices.

The present retrospective study was therefore undertaken to evaluate the pattern of antimicrobial agents used in the orthopedic department of Shantabaa Medical College and General Hospital, with the objectives of assessing the classes and individual agents prescribed, documenting the indications (prophylactic vs. therapeutic), analyzing adherence to standard treatment guidelines, identifying potential areas of irrational use, and providing a baseline dataset to support the development of a structured antimicrobial stewardship program at the institution.