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Background: This case-control study aimed to explore an association between foot alignment and development and presentation of the ingrown toenail., Methods: Radiographs were evaluated for hallux interphalangeal angle (HIA), hallux valgus angle (HVA), talonavicular coverage angle (TNC), talo-first metatarsal (Meary's) angle, and calcaneal pitch angle (CP), as well as medial sesamoid position in a cohort of 103 young and healthy patients (mean age of 20.5 years) with ingrown toenails. A control group of 63 patients was included, and the radiographic parameters were compared. Subgroup analysis was performed in patients with lateral (n = 65) or medial (n = 38) nail fold involvement., Results: The overall study group demonstrated a larger TNC and Meary's angle and smaller CP than the control group, while no significant difference was found regarding the HIA and HVA. The lateral nail fold group had a larger HIA when compared to the medial nail fold group. Multiple regression analysis revealed that for ingrown toenail development, the only risk factor was a decrease in the CP. In the case of lateral nail fold involvement, an increase in the HIA found to be the only factor., Conclusion: A lower medial longitudinal arch seems to be a predisposing factor in developing an ingrown toenail. The lateral nail fold involvement was associated with lateral deviation of the distal phalanx. The result of this study could provide information on prevention, treatment, recurrence, and patient counseling of an ingrown toenail in otherwise young and healthy individuals., (Copyright © 2021 European Foot and Ankle Society. Published by Elsevier Ltd. All rights reserved.)

Retronychia, the posterior embedding of the nail bed into the proximal nail fold, can be a complex clinical dermatologic diagnosis that may mimic other inflammatory ungual diseases or tumors of the nail. It has been related to a history of severe systemic conditions that secondarily affect the nail matrix and is commonly associated with onychomadesis. We present a case of retronychia of the foot with a purely traumatic origin, nonconcomitant with onychomadesis, that was diagnosed by color Doppler ultrasound in a long-time practitioner of martial arts who was otherwise healthy. Color Doppler ultrasound is an excellent imaging technique for supporting the diagnosis of retronychia. It provides information on the exact location and morphology of the nail plate as well as the presence of inflammatory signs in the ungual and proximal periungual regions. Additionally, this imaging technique can support the differential diagnosis with other nail conditions. Since there are many sports or activities that can potentially injure the toenails, retronychia may be an underestimated entity and the present case can raise the awareness of this condition and show the usefulness of color Doppler ultrasound.

Background: A new pattern of ingrown nail, called retronychia is involved in the posterior translation of the whole nail unit producing paronychia., Objective: To demonstrate an unusual case of paronychia that affected three of the fingers on the right hand., Methods: We used 3D ultrasound to study the whole nail unit in the fingers of both the affected (right) and non affected (left) hand., Results: Backward motion of the nail unit with decreased distance between the origin of the nail plates and the distal interphalangeal joint was clearly demonstrated by 3D ultrasound in the affected fingers., Conclusion: 3D ultrasound provides non invasive and more understandable information about the physiopathological changes in retronychia., (© 2011 The Authors. Journal of the European Academy of Dermatology and Venereology © 2011 European Academy of Dermatology and Venereology.)

Background: Chronic infection of ingrown toenails may lead to exogenous osteomyelitis. Therefore, plain x-rays are commonly taken in children with significant inflammation. We evaluated the preoperative radiologic findings and their clinical significance, especially with regard to exogenic osteomyelitis., Patients and Methods: We retrospectively evaluated all patients who underwent surgery for infected ingrown toenails during a 5-year period. Data collection included the history of infection, preoperative laboratory tests, preoperative x-rays, and intraoperative presentation., Findings: One hundred thirty-four patients with infected ingrown nails of the hallux underwent 161 surgical procedures. Mean age at surgery was 14.1 years. Preoperative x-rays were taken in 113 (70.2%) cases. The treating surgeon classified 76 (67.2%) x-rays as negative (no bone affection), 16 (14.2%) as positive (definite bone affection), and 21 (18.6%) as suspicious for bone affection. Only 11 (30%) of 37 children with positive or suspicious x-rays showed bone affection during surgery, which presented as a softening of the cortical bone. None of the children had significantly elevated inflammation markers in the preoperative laboratory tests. Children with positive or suspicious x-rays had a significant longer history of infection compared to those without radiologic abnormalities (8 vs 4.5 weeks mean; P = .024). A reevaluation of the x-rays by an experienced radiologist was undertaken and revealed no case of definite osteolysis., Conclusion: In about one third of all infected ingrown toenails, radiologic changes of the distal phalanx occur. These changes primarily represent periostal reactions. A typical osteomyelitis as a complication of chronically infected ingrown toenails is rare.