A retrospective cohort study of the BioPro hemiarthroplasty prosthesis

We reviewed the outcomes of 79 procedures in 76 patients who underwent first metatarsophalangeal joint hemiarthroplasty. The cohort included 23 men (2 bilateral cases) and 53 women (1 bilateral case), with a mean age of 59.6 +/- 11.05 years and a mean follow-up of 2.91 years (range, 1.6-4.5 years). Hemiarthroplasty with the BioPro Hemi Implant (BioPro, Inc., Port Huron, MI) was undertaken in all cases, and 34 (43.04%) of the procedures involved long flexor transfer to the proximal phalanx. Mean first metatarsophalangeal joint dorsiflexion increased from 36.13 degrees +/- 17.89 degrees to 56.92 degrees +/- 9.82 degrees (P < .0001), plantarflexion increased from 2.71 degrees +/- 8.43 degrees to 9.05 degrees +/- 4.52 degrees (P < .0001), the first intermetatarsal angle decreased from 8.65 degrees +/- 1.17 degrees to 8.41 degrees +/- 0.90 degrees (P = .0009), and the prevalence of first-ray elevatus went from 52 (65.82%) to 44 (55.70%) (P = .0047). Postoperative prevalences included: antalgic gait, 11 (13.92%); normal hallux purchase, 74 (93.67%); satisfaction with the appearance of the great toe, 49 (62.03%); ability to wear conventional shoes, 42 (53.16%); freedom from pain, 45 (56.96%); and satisfaction or high level of satisfaction with the outcome, 68 (86.08%). The mean postoperative American College of Foot and Ankle Surgeons Universal Evaluation score was 94.00 (range, 44-100). Eight (10.13%) cases experienced complications: 2 severe pain (1 required implant removal), 1 sesamoiditis, 1 extensor hallucis longus contracture, 1 hallux subluxation and 1 dislocation, and 2 misaligned implants. Based on these results, use of the BioPro hemi-implant is a useful option for the treatment of first metatarsophalangeal joint degeneration.