Hand Infections and Clinical Mimics — Kanavel Signs, Deep Spaces, Bite Wounds, and Surgical Emergencies

This episode reviews the core principles of hand infections and clinical mimics, focusing on anatomy, microbiology, diagnosis, and surgical decision-making.Topics include Kanavel’s fascial spaces, bacterial burden, Staphylococcus aureus, MRSA, polymicrobial infection in high-risk patients, foreign bodies, lymphangitis, osteomyelitis imaging pitfalls, and the principle that operative treatment should never be delayed when clinical signs point to a deep space infection.Common infections are reviewed from distal to proximal, including acute and chronic paronychia, felon, pyogenic flexor tenosynovitis, collar button abscess, thenar space infection, and midpalmar space infection. High-yield management principles include avoiding the fishmouth incision, recognizing Kanavel’s STEP signs, irrigating flexor sheaths proximal to distal, and protecting critical structures such as the recurrent motor branch of the median nerve.Clinical mimics are emphasized, including herpetic whitlow, gout, pseudogout, pyogenic granuloma, and pyoderma gangrenosum, with attention to conditions where incision and drainage can cause harm. Bite wounds and septic arthritis are also discussed, including cat bites, Pasteurella, fight bites, Eikenella, clenched-fist examination, joint aspiration findings, and the need to leave contaminated wounds open.Surgical emergencies and atypical infections include necrotizing fasciitis, osteomyelitis, Mycobacterium marinum, and Sporothrix schenckii. Additional topics include dishwater pus, the sweep test, sequestrum, deep bone biopsy, rice bodies, special culture requirements, biofilm, and the importance of early range of motion after infection control. Part of Dr. Lara’s Plastic Surgery Compendium — a high-yield audio reference for plastic surgery trainees and surgeons.DisclaimerThis podcast is intended for educational purposes only and is designed for medical students, residents, fellows, and practicing healthcare professionals. It is not intended to provide medical advice, diagnosis, or treatment for any individual patient. The content presented reflects general surgical principles and should not be used as a substitute for formal medical training, clinical judgment, or consultation with qualified healthcare professionals. Listening to this podcast does not establish a physician–patient relationship.SEO / Topic Keywordshand infections, Kanavel signs, pyogenic flexor tenosynovitis, flexor sheath infection, paronychia, chronic paronychia, felon infection, fishmouth incision, collar button abscess, thenar space infection, midpalmar space infection, horseshoe abscess, Space of Parona, radial bursa, ulnar bursa, herpetic whitlow, pyoderma gangrenosum, gout hand, pseudogout hand, fight bite, clenched fist injury, Eikenella corrodens, Pasteurella multocida, cat bite hand, septic arthritis hand, necrotizing fasciitis, osteomyelitis, sequestrum, Mycobacterium marinum, rice bodies, Sporothrix schenckii, biofilm