title: A simple therapeutic approach to pincer nail deformity using a memory alloy: measurement of response.
abstract: BACKGROUND
  Pincer nail deformity (PND) is a dystrophy characterized by transverse overcurvature of the nail plate that may cause intractable pain and decrease the quality of life of patients.
  
  
  OBJECTIVE
  To evaluated the efficacy of a superelastic nickel-titanium (SE NiTi) wire for the treatment of PND using transverse curvature improvement and subjective assessment of pain relief during and after the treatment.
  
  
  METHODS
  SE NiTi wire was implanted over the distal tip of the nail for the treatment of PND in 43 patients (28 female, 15 male), with a total of 73 digits receiving treatment. Evaluations of improvement included measuring changes in transverse curvature of the nail and subjective assessment of pain relief throughout the follow-up period.
  
  
  RESULTS
  In all patients, treatment of the pincer nail with implantation of SE NiTi wire achieved satisfactory results. Significant improvement (p < .05) of the transverse overcurvature of the nail was seen in all patients at 2 months, and relief of pain was determined in 100% of cases throughout our follow-up period.
  
  
  CONCLUSIONS
  This simple SE NiTi wire insertion method is noninvasive and inexpensive, leaves no cosmetic disfigurement, and leads to excellent therapeutic results. Patients achieved great satisfaction. Thus, this technique should be considered the first line of treatment in the correction of mild to moderate PND.
authors: Department of Dermatology, Shuang-Ho Hospital, Taipei Medical University, New Taipei City, Taiwan.
authors: Jonathan Te-Peng
authors: JT
authors: Tseng
authors: Wen-Tsao
authors: WT
authors: Ho
authors: Chun-Hung
authors: CH
authors: Hsu
authors: Ming-Hsiu
authors: MH
authors: Lin
authors: Chien-Nien
authors: CN
authors: Li
authors: Woan-Ruoh
authors: WR
authors: Lee
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009264:Nails, Malformed / Q000601:surgery*; D009532:Nickel; D017060:Patient Satisfaction; D019736:Prostheses and Implants; D014025:Titanium; D016896:Treatment Outcome
chemical_list: C040654:titanium nickelide; D009532:Nickel; D014025:Titanium