Distally based capsule-periosteum interpositional arthroplasty for hallux rigidus. Indications, operative technique, and short-term follow-up.

Twelve patients (15 feet) with severe hallux rigidus underwent distally based capsule-periosteum interpositional arthroplasty of the first metatarsophalangeal joint (mean +/- SD follow-up, 16.8 +/- 7.0 months). Subjective evaluation was based on a modified version of the American Orthopaedic Foot and Ankle Society's 100-point Hallux Metatarsophalangeal-Interphalangeal Joint Scale. Objective evaluation consisted of preoperative and postoperative physical examinations (first metatarsophalangeal joint range of motion and axial grind testing) and radiographic evaluations (joint space width). The short-term results of this novel procedure showed subjective patient improvement and satisfaction, increased first metatarsophalangeal joint dorsal range of motion, maintained hallux plantar range of motion and power, and improved joint space width on anteroposterior and lateral radiographs. None of the patients developed a hallux hammer toe or extensus deformity or lesser metatarsalgia, and none required further surgical intervention. After describing the indications of the procedure and the surgical technique, the authors compare the results with those of the various other procedures available for the surgical treatment of hallux rigidus.