Advertisement for orthosearch.org.uk
Orthopaedic Proceedings Logo

Receive monthly Table of Contents alerts from Orthopaedic Proceedings

Comprehensive article alerts can be set up and managed through your account settings

View my account settings

Visit Orthopaedic Proceedings at:

Loading...

Loading...

Full Access

THE LAPIDUS FUSION WITH A LOCKING SCREW PLATE AND IMMEDIATE WEIGHTBEARING IN 130 FEET



Abstract

Introduction: The modified Lapidus-arthrodesis with standard AO screw-fixation is well known for the treatment of severe metatarsus primus varus deformity respectively a hypermobile or an arthrotic first tarso-metatarsal joint. High rates of non-union and malunion (range 3 to 12%) due to improper or poor fixation despite the postoperative course of nonweightbearing were reported in literature. The immediate postoperative weightbearing protocol varies from 2 to 6 weeks of cast immobilization. To our knowledge, this prospective investigation comprises the largest cohort of patients undergoing the Lapidus-arthrodesis, fixed with the Lapidus-Orthner locking plate.

Methods: 130 feet with an average patient’s age of 52 years (range 23 – 83 years), underwent the Lapidus fusion with the locking Orthner-plate. Indications were severe hallux valgus deformities respectively moderate hallux valgus deformities with a hypermobile first TMT 1- joint or an arthrotic first tarsometatarsal joint. The surgical technique was standardized, and the operations were performed by the inventor of the plate. All patients had a failed trial of nonoperative management (shoe-wear modification).

The 130 feet were divided into 2 groups. Group I was without TMT 1 – compression screw (n= 60) and group II with an additional compression-screw (n=70). Average age of group I was 54-years. The average age of group II was 50-years. The American-Orthopaedic-Foot and Ankle Society (AOFAS) Forefoot-Score, Visual-analog-pain-scale and foot radiographs were assessed preoperatively and after a mean of 23 months for group I and 39 months for group II. All 130 feet were treated immediately postoperative with a postoperative Darco orthowedge ® shoe.

Results: The average AOFAS score improved significantly from preoperative to follow up time-point in both groups. AOFAS pain-subscore significantly improved in both groups. The intermetatarsal-angle (IMA) of all 130 feet decreased significantly from 14° to 6° after surgery. At time of follow-up 9 % of non-unions were seen in group I whereas 0% were seen in group II with proximal compression screw, the difference is significant (p=0,024). The mean immobilisation with the Darco-Ortho® wedge shoe was 7,2 weeks (range 6 to 14 weeks) in group I and 6,3 weeks (range 5 to 12 weeks) in group II.

Conclusion: The prospective mid-term results from this study show that the locking Lapidus-Orthner plate is a very good and promising technique for the Lapidus-arthrodesis. The modified technique with compression screw has shown none non-union, despite of immediate weight-bearing in a post-op shoe after surgery. The procedure significantly reduced pain, the hallux valgus and intermetatarsal angle and increased the patient’s ambulatory capacity and patient satisfaction.

Correspondence should be addressed to Ms Larissa Welti, Scientific Secretary, EFORT Central Office, Technoparkstrasse 1, CH-8005 Zürich, Switzerland