# Bacterial (septic) arthritis - Category: chronic - Review status: reviewed (every claim checked against a document named on this page) - Sources: ICPC-3 (WONCA International Classification of Primary Care, 3rd edition) class LD01.00 - condition scope only, no dose · Septic Arthritis - StatPearls - NCBI Bookshelf - https://www.ncbi.nlm.nih.gov/books/NBK538176/ · Egyptian National Drug Formulary - Antimicrobial 2023 (vancomycin monograph, p333) · Egyptian National Drug Formulary - Antimicrobial 2023 (ceftriaxone monograph, p255) - Verified date: 2026-08 ## Verified against - Bacterial (septic) arthritis - disease-level clinical article (bacterial-septic-arthritis-clinical.txt) - Egyptian National Drug Formulary - Antimicrobial 2023 (vancomycin monograph, p333) - Egyptian National Drug Formulary - Antimicrobial 2023 (ceftriaxone monograph, p255) ## Treatment metadata - Vancomycin — 500 mg — injection - Ceftriaxone — 1000 mg — injection - Referral & safety-netting (no drug therapy) ## Complete treatment card ```text BACTERIAL (SEPTIC) ARTHRITIS Sources: ICPC-3 (WONCA International Classification of Primary Care, 3rd edition) class LD01.00 - condition scope only, no dose · Septic Arthritis - StatPearls - NCBI Bookshelf - https://www.ncbi.nlm.nih.gov/books/NBK538176/ · Egyptian National Drug Formulary - Antimicrobial 2023 (vancomycin monograph, p333) · Egyptian National Drug Formulary - Antimicrobial 2023 (ceftriaxone monograph, p255) Review status: REVIEWED against Bacterial (septic) arthritis - disease-level clinical article (bacterial-septic-arthritis-clinical.txt), Egyptian National Drug Formulary - Antimicrobial 2023 (vancomycin monograph, p333), Egyptian National Drug Formulary - Antimicrobial 2023 (ceftriaxone monograph, p255) (2026-08) IS IT THIS? - reference only, to read alongside your own examination SYMPTOMS - what the patient reports (5) - Sudden-onset pain, fever and swelling in a single joint, with reluctance to move it [fever · refusing to use a limb] - Fever is present in only 40 to 60 percent of cases, so its absence does not rule out infection [fever] - Suspected gonococcal arthritis typically occurs in young, healthy, sexually active adults - In children, local symptoms include pain, swelling, limp, and refusal to use the joint [limp · refusing to use a limb] - Children may also show systemic illness: fever, fast heart rate, irritability, and poor appetite [fever · irritability · poor appetite · tachycardia] SIGNS - what you find (4) - Gonococcal arthritis can present with skin rash, tendon sheath inflammation and a migratory joint pattern [rash] - The knee is the joint most often involved, followed by the hip, shoulder and ankle - Joint effusion is common, with limited range of motion and pain on palpation [joint swelling · reduced range of movement] - Most prosthetic joint infections present with a draining sinus tract TESTS (9) - Synovial fluid analysis, culture, gram stain, crystals, cell count, is the key diagnostic test - A synovial white cell count above 50,000 with over 90 percent neutrophils suggests bacterial infection - Peripheral blood count is usually elevated with a left shift - A high ESR and CRP back up the diagnosis without being conclusive by themselves - In a prosthetic joint, a synovial count of 1100 with 64 percent neutrophils suggests infection - Two sets of blood cultures should be drawn to check for bacteremia - Plain x-rays may show a widened joint space or soft-tissue swelling, but a normal film does not exclude the diagnosis - MRI is sensitive for early joint fluid and can show soft-tissue or bone involvement - Bone scan is nonspecific but useful for localized infection of the hip or sacroiliac joint IF NOT THIS - what else fits (7) - Non-bacterial infectious arthritis: fungal, viral, spirochete or mycoplasma organisms - Crystal arthropathy such as gout or pseudogout - An intra-articular injury: fracture, meniscal tear, or a foreign body - An inflammatory arthritis such as rheumatoid arthritis, lupus, or a spondyloarthropathy - A systemic infection: endocarditis, HIV, or Lyme disease presenting with joint symptoms - A joint tumor, including metastasis or pigmented villonodular synovitis - Bleeding into the joint, a clotting disorder, anticoagulant use, or avascular necrosis Source StatPearls "Septic Arthritis" - disease-level clinical article Status traced to the source above Rx: Empirical antistaphylococcal cover | Added gram-negative cover | Main treatment EMPIRICAL ANTISTAPHYLOCOCCAL COVER 1. VANCOMYCIN [1st line] Adult Intravenous. Where a loading dose is used the formulary gives 25 to 30 mg/kg, then 15 to 20 mg/kg every 8 to 12 hours at normal renal function, adjusted afterwards on measured blood levels. - About 2 weeks intravenously, then 1 to 2 weeks orally - 3 to 4 weeks in total, and 4 to 6 weeks where Pseudomonas is grown Peds 10-15 mg/kg/dose (The formulary prints no ordinary paediatric dose for vancomycin. It appears only as the stated baseline of the renal-adjustment table: those adjustments are based on intravenous doses of 10 mg/kg every 6 hours or 15 mg/kg every 8 hours. Both are per dose, not per day, and each figure is locked to its own interval: 10 mg/kg goes six-hourly and 15 mg/kg goes eight-hourly, which come to 40 and 45 mg/kg a day. They are not a range to pick from freely: pairing the higher amount with the shorter interval gives a daily total the formulary states nowhere. No paediatric ceiling is printed because the formulary states none - the dose is set by measured blood levels, not by a cap.) 3kg -> 30-45 mg/dose 4kg -> 40-60 mg/dose 5kg -> 50-75 mg/dose 6kg -> 60-90 mg/dose 7kg -> 70-105 mg/dose 8kg -> 80-120 mg/dose 9kg -> 90-135 mg/dose 10kg -> 100-150 mg/dose 11kg -> 110-165 mg/dose 12kg -> 120-180 mg/dose 13kg -> 130-195 mg/dose 14kg -> 140-210 mg/dose 15kg -> 150-225 mg/dose 16kg -> 160-240 mg/dose 17kg -> 170-255 mg/dose 18kg -> 180-270 mg/dose 19kg -> 190-285 mg/dose 20kg -> 200-300 mg/dose 21kg -> 210-315 mg/dose 22kg -> 220-330 mg/dose 23kg -> 230-345 mg/dose 24kg -> 240-360 mg/dose 25kg -> 250-375 mg/dose 26kg -> 260-390 mg/dose 27kg -> 270-405 mg/dose 28kg -> 280-420 mg/dose 29kg -> 290-435 mg/dose 30kg -> 300-450 mg/dose 31kg -> 310-465 mg/dose 32kg -> 320-480 mg/dose 33kg -> 330-495 mg/dose 34kg -> 340-510 mg/dose 35kg -> 350-525 mg/dose 36kg -> 360-540 mg/dose 37kg -> 370-555 mg/dose 38kg -> 380-570 mg/dose 39kg -> 390-585 mg/dose 40kg -> 400-600 mg/dose 41kg -> 410-615 mg/dose 42kg -> 420-630 mg/dose 43kg -> 430-645 mg/dose 44kg -> 440-660 mg/dose 45kg -> 450-675 mg/dose 46kg -> 460-690 mg/dose 47kg -> 470-705 mg/dose 48kg -> 480-720 mg/dose 49kg -> 490-735 mg/dose 50kg -> 500-750 mg/dose AWaRe WATCH group - carries resistance cost. Egyptian EML 2025. Source Egyptian National Drug Formulary - Antimicrobial 2023 (vancomycin monograph, p333) Why The card's article states that empirical antibiotic coverage includes antistaphylococcal coverage - nafcillin, oxacillin or vancomycin - for all age and risk categories, and that empirical treatment of non-gonococcal septic arthritis usually involves intravenous vancomycin against gram-positive organisms, especially where MRSA is suspected on local data. It states no amount. The amounts here are the Egyptian formulary's, and the formulary states them only inside its renal-adjustment table: the first row of that table is normal renal function. Caution NAFCILLIN AND OXACILLIN ARE NOT REGISTERED IN EGYPT. The article names all three; only vancomycin is on the Egyptian register, which is why it is the row. THE DOSE IS SET BY BLOOD LEVELS, NOT BY THE NUMBER ABOVE. The formulary asks for initial dosing on actual body weight and for every subsequent dose to be adjusted on therapeutic monitoring, and for levels to be monitored in any degree of renal impairment. The figure printed is a starting point for a patient with normal kidneys. THE KIDNEYS DECIDE THE INTERVAL, AND MOSTLY NOT THE DOSE. In the formulary's adult table the maintenance dose is 15 to 20 mg/kg both above a creatinine clearance of 90 and in the 50 to 90 band; what changes between them is the interval, 8 to 12 hours becoming 12 hours, and the loading dose, 25 to 30 mg/kg becoming 20 to 25 mg/kg. Only below a clearance of 50 does the maintenance dose itself fall, to 10 to 15 mg/kg every 24 hours. The paediatric table is separate and is keyed on GFR: 10 mg/kg per dose every 12 hours at a GFR of 30 to 50, every 18 to 24 hours at 10 to 29, and at under 10 a single 10 mg/kg dose redosed on measured levels. DRAINING THE JOINT IS HALF THE TREATMENT. The article's regimen is antimicrobial therapy AND joint fluid drainage by arthrotomy, arthroscopy or daily needle aspiration, with the orthopaedic surgeon deciding which. Antibiotics alone are not the treatment. ASPIRATE BEFORE THE FIRST DOSE WHERE THAT IS POSSIBLE. The article asks for empirical intravenous therapy to start promptly after joint aspiration is complete and cultures are taken - starting antibiotics first can make the culture unreadable. THIS IS A HOSPITAL INFUSION, NOT A CLINIC DRUG. The regimen is printed so the GP knows what the patient is being sent for and can recognise it, not so it is started in the surgery. Referral comes first. Do not give in hypersensitivity to vancomycin or any component of the formulation. Egypt KEMPOVANCOM 500 MG VIAL KAHIRA > MODE... 18.00 EGP VANCOZIN 500 MG VIAL EIMC > KOREA ... 38.00 EGP VANCOMIX 500MG I.V. VIAL SIGMA TEC 79.00 EGP VANCOGUT 500 MG PD. FOR I.V. INF. VIAL ARABCOMED 95.00 EGP VANCOLON 500MG I.V. VIAL JULPHAR 95.50 EGP EDICIN 500 MG PD FOR I.V. INF. VIAL GLOBAL PHARMACEUTICAL INDUSTRIES 118.00 EGP VANCOBACT 500 MG VIAL FOR I.V. INF. ARABCOMED > EGYPHARMA 118.00 EGP VANCOMYCINE VIATRIS 500 MG VIAL VIANAX - GREE... 142.00 EGP ADDED GRAM-NEGATIVE COVER 2. CEFTRIAXONE [1st line] Adult 1 to 2 g intravenously or intramuscularly once daily, or the same total divided into two doses. Maximum 4 g daily. - Added to the antistaphylococcal cover for the same course; in gonococcal arthritis it is continued for 24 to 48 hours after improvement, then oral treatment for the rest Peds 100 mg/kg/day [child max 2000 mg] (The formulary gives two paediatric figures by severity, and the one printed is the severe-infection figure, because a joint that needs draining is not a mild infection: 100 mg/kg/day divided every 12 to 24 hours. Its mild-to-moderate figure is lower - 50 to 75 mg/kg once daily, maximum 1,000 mg/day. The formulary states three ceilings and they do not agree. The severe-infection dose line itself carries a maximum of 4,000 mg a day. Its Prescribing Limits section separately caps a child at 2 g daily for most infections and at 4 g daily for endocarditis or meningitis. The 2 g figure is the one applied above, because septic arthritis is neither endocarditis nor meningitis - which means the calculator stops rising at 20 kg, and a 30 kg child is shown 2,000 mg where 100 mg/kg would be 3,000 mg. The formulary supports the higher figure on its own dose line; the lower one is used here, and both are written out so the choice is visible rather than silent. A premature or term neonate is dosed separately at 50 mg/kg every 24 hours.) 3kg -> 300 mg/day 4kg -> 400 mg/day 5kg -> 500 mg/day 6kg -> 600 mg/day 7kg -> 700 mg/day 8kg -> 800 mg/day 9kg -> 900 mg/day 10kg -> 1000 mg/day 11kg -> 1100 mg/day 12kg -> 1200 mg/day 13kg -> 1300 mg/day 14kg -> 1400 mg/day 15kg -> 1500 mg/day 16kg -> 1600 mg/day 17kg -> 1700 mg/day 18kg -> 1800 mg/day 19kg -> 1900 mg/day 20kg -> 2000 mg/day 21kg -> 2000 mg/day (capped) 22kg -> 2000 mg/day (capped) 23kg -> 2000 mg/day (capped) 24kg -> 2000 mg/day (capped) 25kg -> 2000 mg/day (capped) 26kg -> 2000 mg/day (capped) 27kg -> 2000 mg/day (capped) 28kg -> 2000 mg/day (capped) 29kg -> 2000 mg/day (capped) 30kg -> 2000 mg/day (capped) 31kg -> 2000 mg/day (capped) 32kg -> 2000 mg/day (capped) 33kg -> 2000 mg/day (capped) 34kg -> 2000 mg/day (capped) 35kg -> 2000 mg/day (capped) 36kg -> 2000 mg/day (capped) 37kg -> 2000 mg/day (capped) 38kg -> 2000 mg/day (capped) 39kg -> 2000 mg/day (capped) 40kg -> 2000 mg/day (capped) 41kg -> 2000 mg/day (capped) 42kg -> 2000 mg/day (capped) 43kg -> 2000 mg/day (capped) 44kg -> 2000 mg/day (capped) 45kg -> 2000 mg/day (capped) 46kg -> 2000 mg/day (capped) 47kg -> 2000 mg/day (capped) 48kg -> 2000 mg/day (capped) 49kg -> 2000 mg/day (capped) 50kg -> 2000 mg/day (capped) AWaRe WATCH group - carries resistance cost. Egyptian EML 2025. Source Egyptian National Drug Formulary - Antimicrobial 2023 (ceftriaxone monograph, p255) Why The card's article states that where the patient is immunocompromised, injects drugs, or the Gram stain is negative, a third-generation cephalosporin such as ceftriaxone, ceftazidime or cefotaxime should be added for gram-negative cover, and that gonococcal arthritis responds well to intravenous ceftriaxone. It states no amount. The amount is the Egyptian formulary's, whose ceftriaxone monograph names septic arthritis in its own indication list. Caution THIS IS AN ADDITION FOR SELECTED PATIENTS, NOT THE ROUTINE SECOND DRUG. The article adds the cephalosporin where the patient is immunocompromised, injects drugs, or the Gram stain is negative, and for suspected Salmonella or gonococcal infection. Everyone gets the antistaphylococcal cover; not everyone gets this. NOT IN A NEONATE ALONGSIDE INTRAVENOUS CALCIUM. The formulary contraindicates ceftriaxone with intravenous calcium-containing products in a neonate of 28 days or under, and in a jaundiced neonate - especially a premature one - because it displaces bilirubin from albumin. Cefotaxime is the third-generation cephalosporin to use there. THE CULTURE DECIDES WHAT FOLLOWS. The article asks for blood and synovial fluid cultures and sensitivities to direct the prolonged course; this empirical choice lasts until they come back. IF NOTHING IMPROVES IN 5 TO 6 DAYS, THE ANSWER IS NOT MORE ANTIBIOTIC. The article asks for the joint to be re-aspirated and for Lyme disease and other causes to be ruled out. Do not give in hypersensitivity to ceftriaxone, any component, or another cephalosporin. Egypt ZOXIDEL 1 GM PD. FOR I.M. INJ. RAMEDA > DELT... 22.00 EGP CEFTRIAXONE SODIUM 1 GM I.M.VIAL (KAHIRA) KAHIRA 29.00 EGP ZOXIDEL 1 GM PD. FOR I.V. INJ. RAMEDA > DELT... 29.00 EGP WINTRIAXONE 1 GM PD. FOR I.V INJ. SANOFI 48.00 EGP VOTRIAXONE 1 GM I.M VIAL CHEMIPHARM 56.00 EGP OFRAMAX 1 GM I.M. VIAL RAMEDA > SUN ... 71.00 EGP TRIAXONE 1 GM I.M. VIAL TABUK PHARMAC... 106.00 EGP TRIAXONE 1 GM I.V VIAL TABUK PHARMAC... 106.00 EGP MAIN TREATMENT 3. REFERRAL & SAFETY-NETTING (NO DRUG THERAPY) [1st line] Adult An orthopaedic emergency that risks permanent joint destruction; the GP recognises it and refers urgently for joint aspiration and inpatient intravenous antibiotics rather than treating as an outpatient. - Refer, with advice Peds Children follow the same pathway: recognise and refer. No primary-care medicine is implied. Source No dose - referral pathway, no medicine given in primary care Why An orthopaedic emergency that risks permanent joint destruction; the GP recognises it and refers urgently for joint aspiration and inpatient intravenous antibiotics rather than treating as an outpatient. Caution Hot, swollen, immobile joint, inability to bear weight, fever, rapid onset, prosthetic joint involvement. The drug rows above are what the treating service gives. They are here so that the referral is an informed one and so the GP can recognise the regimen the patient comes back on - not as permission to start it without the referral. RED FLAG - Staphylococcal septic arthritis carries a mortality rate exceeding 50%, requiring urgent emergency orthopedic evaluation. Prices are indicative (dataset snapshot 2026-06); verify with the pharmacy. ``` --- Dawaa Reference is a reference for prescribers, not a medical device, and does not replace clinical judgement. [Privacy policy](/privacy)