Journal Publications


Treace Medical Concepts is dedicated to advancing the understanding of the Lapiplasty® Procedure and its benefits to patients, surgeons, and the healthcare system through research studies and publications in the peer-reviewed literature.



Effect on Foot Width With Triplanar Tarsometatarsal Arthrodesis for Hallux Valgus
Vaida J, Ray J, Shackleford T, DeCarbo W, Hatch D, Dayton P, McAleer J,
Smith B, Santrock R.
Foot & Ankle Orthopaedics 2020, 5(3): 1-5

Summary: Multicenter, retrospective study of 144 patients (148 feet) who underwent triplane 1st TMT correction using Biplanar™ Plating. All patients demonstrated a decrease in bony and soft tissue width after surgery. Bony width decreased by 10.4 mm (10.8%) postoperatively, whereas soft tissue width decreased 7.3 mm (6.8%) postoperatively after triplanar first TMT arthrodesis.
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Comparison of Radiographic Measurements Before and After Triplane Tarsometatarsal Arthrodesis for Hallux Valgus
Dayton P, Carvalho S, Egdorf R, Dayton M,
J Foot Ankle Surg. 2020, 59(2): 291-297

Summary: Retrospective study of radiographic outcomes from 108 patients (109 feet) that underwent triplane 1st TMT correction using biplanar plating and began weight-bearing as tolerated within the first week after surgery. At an average follow up of 17.4 months, the results demonstrated all patients achieved successful bony healing of the operative joint, with 99.1% of patients maintaining their 3-plane correction (0.9% recurrence rate) and no hardware failures reported.
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Multicenter Early Radiographic Outcomes of Triplanar Tarsometatarsal Arthrodesis With Early Weightbearing
Ray JJ, Koay J, Dayton PD, Hatch DJ, Smith B, Santrock RD
Foot Ankle Int. 2019 Aug;40(8):955-960.

Summary: Multicenter, retrospective study of 57 hallux valgus (62 feet) patients treated with the Lapiplasty® Procedure and early return to weight-bearing (average 10.9 days post-op). At average follow-up of 13.5 months, the results demonstrated that 96.8% of study patients maintained their 3-plane bunion correction (Intermetatarsal Angle, Hallux Valgus Angle, and Tibial Sesamoid Position), and only 1.6% experienced a symptomatic non-union complication.
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Progression of Healing on Serial Radiographs Following First Ray Arthrodesis in the Foot Using a Biplanar Plating Technique Without Compression
Dayton P, Santrock R, Kauwe M, Gansen G, Harper S, Cifaldi A, Egdorf R, Eisenschink JJ
J Foot Ankle Surg. 2019 May;58(3):427-433.

Summary: Multicenter, retrospective study of bone healing with accelerated weightbearing protocol in patients undergoing TMT or MTP fusions with Lapiplasty® biplanar plating. 195 patients were included with mean follow up of 9.5 months. Patients were allowed to begin weightbearing on the operative foot approximately at post-op day 5. 97.4% of patients demonstrated successful bony fusion and 98.9% maintained a stable joint position over the course of the study.
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Triplane Hallux Abducto Valgus Classification
Hatch DJ, Santrock RD, Smith B, Dayton P, Weil L Jr.
J Foot Ankle Surg. 2018, 57:972–981.

Summary: Rather than the 2D hallux valgus classification systems traditionally referenced, this manuscript presents a novel 3-plane (3D) classification system for the evaluation and procedure selection for hallux valgus treatment.
Class 1 - No metatarsal rotation;
Class 2A - Metatarsal rotation without sesamoid subluxation;
Class 2B - Metatarsal rotation with sesamoid subluxation;
Class 3 - Metatarsus adductus bunion;
Class 4 - Degenerative (DJD) bunion.
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Biomechanical Characteristics of Biplane Multiplanar Tension-Side Fixation for Lapidus Fusion
Dayton P, Hatch DJ, Santrock RD, Smith B
J Foot Ankle Surg. 2018, 57:766-770.

Summary: Biomechanical study comparing the Lapiplasty® Plantar Python® tension-side fixation construct to Lapiplasty® Biplanar™ Plating, demonstrating a 17% improvement in maximum load to failure and a 103% increase in the cycles to failure (simulating post-operative weight-bearing).
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Evidence-Based Bunion Surgery: A Critical Examination of Current and Emerging Concepts and Techniques
Dayton, Paul D. (Ed.)
Springer International Publishing [Textbook]. 2018.

Summary: This textbook provides a critical examination of the traditions and techniques commonly taught for bunion surgery and contrasts them with new, evidence-based anatomic and surgical concepts (including the Lapiplasty® Procedure).
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Hallux Valgus Deformity and Treatment. A Three-Dimensional Approach: Modified Technique for Lapidus Procedure
Santrock RD, Smith B
Foot Ankle Clin. 2018, 23:281-295.

Summary:Manuscript reviews the 3-plane hallux valgus classification system, the novel surgical steps of the Lapiplasty® Procedure, the Lapiplasty® Biplanar™ plating biomechanical results, and presents clinical outcome data from a 49-patient multicenter study demonstrating 96% maintenance of 3-plane correction and 0% non-union rate at 4 months following an immediate weight-bearing protocol with the Lapiplasty® Procedure.
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Understanding Frontal Plane Correction in Hallux Valgus Repair
Smith WB, Dayton P, Santrock RD, Hatch DJ
Clin Podiatr Med Surg. 2018, 35:27-36.

Summary: Manuscript challenges traditional two-dimensional (2D) evaluation and management of the hallux valgus deformity, presenting a 3-plane hallux valgus classification system and the detailed surgical technique steps of the novel Lapiplasty® Procedure for triplanar hallux valgus correction.
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Comparison of Tibial Sesamoid Position on Anteroposterior and Axial Radiographs Before and After Triplane Tarsal Metatarsal Joint Arthrodesis
Dayton P, Feilmeier M
J Foot Ankle Surg. 2017, 56:1041-1046.

Summary: Clinical study of 21 feet at 5.2 month average follow-up demonstrating the ability of the Lapiplasty® Procedure to successfully correct the three-dimensional (3D) deformity (including metatarsal frontal-plane rotation) in 95.2% of cases, and also restore the intermetatarsal angle to 5.5°, hallux valgus angle to 7.3°, and tibial sesamoid position to 1.8.
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Multiplanar Alignment System to Guide Triplanar Correction of Hallux Valgus Deformity
Smith WB, Santrock RD, Hatch DJ, Dayton P
Techniques in Foot & Ankle Surgery. 2017, 16:175-82.

Summary: Manuscript presents a novel, instrumented approach to 3-plane (3D) Lapidus fusion (Lapiplasty® Procedure) for correction of the hallux valgus deformity, including indications/contraindications for 3-plane Lapidus arthrodesis, 3-plane x-ray views for preoperative planning, detailed surgical technique steps of the novel, instrumented Lapiplasty® Procedure, and potential complications.
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Comparison of the Mechanical Characteristics of a Universal Small Biplane Plating Technique Without Compression Screw and Single Anatomic Plate with Compression Screw
Dayton P, Ferguson J, Hatch D, Santrock R, Scanlan S, Smith B
J Foot Ankle Surg. 2016, 55:567-71.

Summary: Biomechanical study comparing Lapiplasty® Biplanar™ Plating to a commonly-used anatomic plate and screw Lapidus fixation construct, demonstrating significant improvements in biomechanical performance under maximum load to failure and cyclic loading (simulating post-operative weightbearing).
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