Hygiene in Podiatric Practice: How to Recognise a Good Practice

What lies behind it

Medical foot treatment requires a deep understanding of microbiology and epidemiology. Different micromilieus meet on the feet. Moisture, warmth, and mechanical stress create ideal conditions for pathogens to survive. Among the most common pathogens in podiatry are dermatophytes such as Trichophyton rubrum and Trichophyton interdigitale, which are responsible for the vast majority of nail and foot fungal infections. Yeast fungi of the genus Candida and gram-positive bacteria, including Staphylococcus aureus, are also found, which can trigger purulent inflammation of the nail fold. Human papillomaviruses (HPV), particularly types 1, 2, and 4, are the cause of painful verrucae plantares, better known as plantar warts.

To prevent these pathogens from being transmitted from one patient to the next, podiatry practices are subject to strict legal requirements. The German Medical Device Operator Ordinance (Medizinprodukte-Betreibverordnung, MPBetreibV), together with recommendations from the Commission for Hospital Hygiene and Infection Prevention (KRINKO) at the Robert Koch Institute and the Federal Institute for Drugs and Medical Devices (BfArM), regulates the reprocessing of medical devices. Podiatric instruments are classified according to their risk profile. A distinction is made between semi-critical medical devices, which only come into contact with intact mucous membranes or altered skin, and critical medical devices. The latter penetrate the skin tissue barrier or come into contact with blood and tissue fluid.

Critical instruments, which include scalpel blades, nail nippers, gouges, and corner files, must undergo a validated sterilisation process before being used again. This reprocessing procedure serves to kill all viable microorganisms, including their spore-forming persistent forms. Mere disinfection is insufficient for invasively used tools, as spores are resistant to conventional liquid disinfectants. The standard underlying hygiene in podiatry therefore requires specialised equipment, certified procedures, and precise documentation of all working steps.

The generation of aerosols and fine dusts presents a particular challenge. When high-speed rotating instruments such as burs or sanding caps are used to remove thickened nail plates or calluses, fine particles are created. These dusts contain horn material as well as viable fungal spores, bacteria, and skin flakes. Without adequate protective measures, these airborne particles disperse in the treatment room, are inhaled by staff and subsequent patients, or settle on surfaces. Modern practice hygiene must therefore encompass instrument reprocessing as well as room air and surface disinfection.

Typical signs

Patients can recognise the hygiene quality of a practice by specific visual and organisational features. A central criterion is the hand-over of instruments. In a professionally qualified practice, nail nippers, tweezers, and corner elevators are not left lying exposed on the worktable or in drawers. Instead, they are removed individually for each patient from a sealed sterile package. These transparent pouches feature an indicator field that confirms through a color change that thermal sterilisation in the autoclave was successful. Opening this packaging takes place directly before the treatment begins, in full view of the patient.

The appearance of the treatment station also provides information about the hygiene status. The surfaces of the treatment chair, footrest, and work surfaces must be free of dust, skin flakes, or visible residues from previous treatments. A professional treatment team performs a wipe disinfection of potentially contaminated surfaces after every patient. For this purpose, surface disinfectants with proven efficacy are used. The required contact time of the disinfectant is strictly observed before the next patient takes a seat in the treatment chair.

Another visible sign of active infection control is the personal protective equipment of the podiatric staff. Prior to every treatment, hygienic hand disinfection is performed in accordance with the guidelines of the Association of the Scientific Medical Societies (AWMF). Staff wear single-use nitrile or latex gloves during every treatment, which are disposed of immediately after completing the measures. For dust-intensive work such as burring mycotic nails, a tight-fitting FFP2 face mask and protective goggles are standard equipment to protect the mucous membranes from micro-splinters and aerosols.

The presence of modern suction technology is easily identified by the noise level and design of the treatment units. Professional podiatry units feature integrated suction systems located directly at the handpiece tip. Alternatively, wet spray techniques are used in which a fine water mist immediately binds the grinding dust. If such a device is completely lacking and a dense layer of dust settles on the patient's skin and the practitioner's clothing during grinding, this does not comply with today's standards of medical foot treatment.

Causes in everyday practice

Hygiene failures in treatment facilities rarely arise from deliberate neglect, but frequently from knowledge gaps, economic pressure, or outdated routines. In inadequately trained businesses, purchasing expensive cleaning and disinfection equipment is often avoided. However, manual cleaning of instruments in a sink carries significant potential for errors. Improper scrubbing with brushes creates spray shadows in which pathogens survive. Furthermore, there is a high risk of cut and puncture injuries for staff, which can lead to pathogen transmission.

A frequently encountered error is confusing disinfection with sterilisation. In some cosmetic salons or non-podiatric foot care practices, nippers and burs are merely placed in an ultrasonic bath or a disinfectant solution after use and then reused directly. Although liquid chemical disinfection kills many vegetative bacteria, it does not achieve absolute sterility. Resistant viral envelopes and bacterial endospores in particular survive this process. If such incompletely reprocessed tools are used on a patient with nail fold inflammation or minor skin tears, direct pathogen cross-contamination occurs.

Systemic errors also occur in everyday practice when using rotating instruments such as diamond grinders or carbide burs. These attachments possess complex geometries with fine grooves and pores. If these burs are not cleaned after use in a specialized ultrasonic bath containing suitable enzymatic cleaner solutions, organic tissue residues remain within the serrations. These proteins bake in during subsequent thermal treatment and form a protective layer for underlying germs. Complete eradication of germs is rendered impossible as a result.

Underestimating aerosol exposure likewise leads to hygiene vulnerabilities. If targeted suction is omitted during dry grinding, the particle concentration in the room air increases drastically. A practical case example illustrates the impact: in an inadequately ventilated treatment room without suction, an asthmatic patient inhaled fungal spores from a previous patient, leading to exogenous bronchial irritation. Only the consistent use of HEPA H14 class fine dust filters in the suction unit can reliably filter such suspended matter from the air.

When medical evaluation is necessary

Not every skin irritation following foot treatment is attributable to a hygiene deficit, but certain symptoms require immediate medical evaluation by a specialist in dermatology or general medicine. If local signs of inflammation develop within 24 to 72 hours after a podiatric intervention, a bacterial infection must be considered. Classical signs of inflammation include increasing, sharply demarcated redness (rubor), noticeable local warmth (calor), swelling (tumor), as well as throbbing or stabbing pain (dolor).

Particular attention is required if purulent secretions form around the nail fold or sole. Yellowish or greenish fluid accumulations indicate colonization by staphylococci or pseudomonads. An abscess near the distal phalanx of a toe usually requires surgical incision or systemic antibiotics to prevent progression into the bone structure (osteomyelitis). The appearance of red streaks spreading from the foot region towards the groin is also an alarm sign for lymphangitis, which must be treated medically without delay.

Risk groups such as people with diabetes mellitus, peripheral arterial disease (PAD), or polyneuropathy must be especially vigilant regarding the smallest skin injuries. Due to reduced pain perception and impaired tissue perfusion, lesions heal poorly in these patients. Untreated trauma can rapidly develop into a diabetic foot ulcer. If malaise, chills, or fever occur, a systemic infectious reaction is present. In these cases, immediate attendance at an emergency department or specialized foot clinic is required.

What podiatric treatment can achieve

A qualified podiatry practice counters these risks through seamless, validated hygiene management that goes far beyond visible cleanliness. The instrument cycle follows a strict protocol that makes every single step traceable. Following treatment, all used instruments are transported in closed containers to the separate reprocessing room. Machine-based or ultrasound-supported cleaning and disinfection take place there first. A washer-disinfector (Reinigungs- und Desinfektionsgerät, RDG) rinses the instruments at defined temperatures and chemical concentrations to dissolve proteins and inactivate germs.

Following drying and visual inspection under a magnifying glass, the instrument sets are packaged. They are heat-sealed into special sterilisation pouches that are permeable to water vapour but remain germ-tight after cooling. Sterilisation then takes place in a Class B autoclave. This fractionated pre-vacuum steriliser evacuates air from the chamber multiple times so that hot water vapour penetrates even the smallest cavities of nippers and joints. Medical devices are treated for a defined holding time at a temperature of 134 degrees Celsius and a pressure of approximately 2.1 bar.

Every sterilisation run is recorded electronically. Pressure, temperature, and time are stored digitally and assigned to the respective batch. Barcodes printed on the packaging make it possible to document retroactively for every patient which precisely traceable instrument set was used during treatment. This complete traceability guarantees the patient the highest level of safety. An insight into our practice shows how these technical systems are integrated into daily routines.

Another central component is suction and burring technology. Modern podiatry units operate with high-performance suction systems whose filter stages retain microparticles down to the sub-micrometre range. Alternatively, wet spray technology offers the advantage that burred material is bound at its source by a fine water-alcohol mist. As a result, the release of aerosols into the room air is almost completely prevented. Treatment durations typically range between 30 and 45 minutes, during which all hygiene steps are precisely coordinated.

Treatment intervals depend on individual clinical findings and the patient's risk profile. For diabetics or patients prone to ingrown nails, a four to six-week rhythm is usually recommended. During this period, nail regrowth can be monitored without excessive callus formation developing. Reprocessing treatment rooms between individual patients occupies fixed time windows that are scheduled into the practice workflow.

What you can do yourself

As a patient, you have various options for increasing your own safety against infection and supporting the success of podiatric treatment. An attentive look at the surroundings and open dialogue with the practice team help build trust and address concerns.

The following steps assist you in correctly assessing hygiene in daily life and during treatment appointments:

• Before treatment begins, observe whether the instrument set is taken from a sealed pouch and check the indicator field for a dark discolouration.
• Observe whether the practitioner performs hygienic hand disinfection prior to putting on single-use gloves.
• Wash your feet regularly at home using a mild, lipid-replenishing wash lotion and dry the spaces between the toes thoroughly.
• Change towels and socks daily and wash them at a minimum of 60 degrees Celsius to reliably kill fungal spores.
• Disinfect your shoes regularly using a suitable shoe disinfectant to prevent spores from surviving inside the footwear.

Should you feel uncertain regarding hygiene procedures, do not hesitate to address the practice team directly. A professionally managed specialist practice will gladly explain the implemented protective measures and sterilisation cycle to you at any time.

Common errors

Typical behaviors that increase the risk of foot infections or nullify the hygiene efforts of the podiatrist are frequently seen in practice. A widespread misconception is assuming that visual cleanliness is equivalent to sterility. An instrument can shine like metal and still carry millions of invisible spores on its surface.

Among the most common errors made by patients are:

• Using personal, unsterilised clippers or files on already infected areas, thereby transferring pathogens to healthy toes.
• Walking barefoot in treatment rooms, changing areas, or sanitary facilities, which promotes direct acquisition of verruca viruses.
• Aggressively cutting the nail folds with sharp scissors, leading to micro-lesions and opening pathways for bacteria into the tissue.
• Using aggressive callus planes or rasps at home, which often injure deeper skin layers and create portals of entry for infection.
• Neglecting follow-up appointments, causing persistent inflammation to be detected and treated only at a late stage.

Another issue lies in confusing purely cosmetic pedicure services with medical podiatry. While cosmetics primarily focuses on visual appearance and often works with reusable, unsterilised files, podiatry as a healthcare profession is subject to the strict directives of the Medical Devices Act. Anyone presenting with damaged nails or diabetic foot syndrome should seek treatment exclusively in state-recognised specialist practices.

Current state of research

The scientific evidence regarding the relevance of strict hygiene guidelines in podiatry is unambiguous. Studies on microbial contamination of practice facilities show that without adequate suction and wipe disinfection, significant quantities of Trichophyton rubrum as well as staphylococci can be detected on surfaces within a radius of up to two metres around the treatment chair [1]. Investigation of aerosols during the burring of onychomycosis nails confirmed that spore load in the room air increases manifold without local suction systems [2].

Research into the efficacy of sterilisation methods further demonstrates that only thermal procedures in a steam steriliser (Class B autoclave) guarantee reliable destruction of highly resistant bacterial endospores such as Bacillus atrophaeus [3]. Chemical immersion baths or older hot-air sterilisers frequently display uncertainties regarding heat penetration in complex jointed instruments. KRINKO recommendations therefore emphasize the necessity of validated, automated reprocessing procedures to reduce the risk of iatrogenic infections in medical foot treatment facilities to near zero [4].

Studies on patient safety highlight that patients with diabetic neuropathy in particular benefit from these standards. Due to the absence of pain perception, minor tissue damage often remains unnoticed. If a pathogen enters via inadequately reprocessed tools in these cases, the risk of severe tissue complications increases significantly. Adherence to strict infection control standards is thus an indispensable component of preventive medicine.

Treatment in Memmingen

In our practice in Memmingen, we place the highest value on transparency and absolute compliance with statutory hygiene regulations. As an experienced podiatrist and sectoral practitioner of podiatry (sektorale Heilpraktikerin), Helga Maria Freitag leads a team that digitally monitors and seamlessly documents the entire instrument cycle. From automated cleaning to sterilisation in a Class B autoclave, every step corresponds to current recommendations of the Robert Koch Institute.

Our practice premises at Kempterstr. 25 in 87700 Memmingen are equipped with state-of-the-art suction systems and ergonomic treatment chairs. We care for patients from across the entire Memmingen city area as well as the surrounding regions in the Unterallgäu, Allgäu, and Upper Swabia. If you have questions about our hygiene standards or wish to receive information on our sound services, we are available by telephone on 089 15880714 or in person. We invite you to see our quality for yourself.