• Vol. 50 No. 10
  • 25 October 2021

Joint preserving surgery for osteoarthritis of the big toe using a cartilage-like implant

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Dear Editor,

Osteoarthritis of the big toe (hallux rigidus) is a common arthritic condition of the first metatarsophalangeal joint (MTPJ), beginning with stiffness, pain and inflammation. This subsequently progresses to restriction of movements especially dorsiflexion.1 Articular surface degeneration and formation of periarticular osteophytes may be seen on radiographs.2 Common causes include activity-related repetitive trauma (sports and occupational) and inappropriate footwear.1,3 Other factors are direct toe injury, fractures, rheumatoid arthritis, increased age, long proximal phalanx of toe, hypermobile first ray, tarsal coalition, ankylosis of sesamoids to the first metatarsal head, irregular morphology, soft tissue contracture and family history.

Treatment options of hallux rigidus remain controversial. These vary from cheilectomy, soft tissue release, first metatarsal osteotomies, arthrodesis, excisional arthroplasty; to hemiarthroplasty and total arthroplasty using different implants such as metal alloy, silastic and ceramic.4-6 In our local practice, the commonest surgery for advanced hallux rigidus is arthrodesis. This often results in lower patient satisfaction levels owing to reduction in range of toe movement. Cartiva synthetic cartilage implant (SCI) has been approved by the US Food and Drug Administration (FDA) as an implant for hallux rigidus surgery. The polymer-based polyvinyl alcohol (PVA) implant is recognised as the first synthetic material closest to human joint cartilage. This paper discusses operative technique and clinical outcomes of this innovative joint preservation surgery.

Design and specification of implant. Cartiva SCI is a moulded cylindrical implant composed of PVA and saline. Rigorous biomechanical testing has demonstrated its ability to withstand forces normally subjected on the great toe.7,8 Approved by the FDA in 2016 as a PVA hydrogel implant, it is currently used in the US, UK and Europe.

Indications for use. The procedure is reserved for Grade 3 and 4 hallux rigidus where the disease process would be considered moderately severe to severe.9 Patients would have undergone a trial period of non-operative management including analgesia as well as footwear and lifestyle modification. Although this procedure is not considered first line treatment, should patients have had longstanding history of first MTPJ pain lasting several years, then it may be offered at first consultation.

Contraindications. The use of Cartiva SCI is not recommended in cases involving active infection, known/suspected allergy to PVA, gout or rheumatoid arthritis involving first MTPJ and tumour of surrounding bone or tissue.8

We present our series of the first 5 cases using this implant. All patients have Grade 3 or 4 hallux rigidus having failed conservative treatment. Pain, function and alignment was graded using an American Orthopaedic Foot and Ankle Society score.10

Operative procedure. Surgery is performed with the use of a tourniquet and prophylactic antibiotics. Approach is via a longitudinal dorsal centred over the first MTPJ, followed by dissection down to the joint capsule. The joint is exposed and the periarticular osteophytes are removed. Exposure of the metatarsal head and proximal phalanx is achieved with deep flexion of the joint. A guide wire is inserted into the medullary canal through the centre of the metatarsal head and its position is confirmed with intraoperative imaging. A cannulated drill is then used to core out of the metatarsal head to the desired size (Fig. 1A) for the Cartiva implant. Following the removal of any debris and washing out of the cavity, the implant is carefully inserted using an introducer. The press-fitted final position allows the implant to sit and a 2mm protrusion of the top of the implant into the joint is deemed the appropriate height (Fig. 1B). Range of motion of the joint and stability of implant is checked before closing the capsule.

Fig. 1. Intraoperative images of operative procedure. (A) Metatarsal head following excision of surrounding osteophytes and canal preparation. Note the area of cartilage loss. (B) Well-fitted and appropriately sized (10mm diameter) Cartiva implant.

Postoperative care. All patients were discharged on the same day of surgery. Patients were provided an orthopaedic stiff-soled sandal and allowed to weight bear on the operated foot. Early range of motion exercises were started immediately after surgery to prevent joint stiffness. Wound inspection was performed 1 week post-surgery and sutures removed after 2 weeks.

Discussion. Recent local studies of osteoarthritis in larger joints have shown that joint replacement has yielded promising results across different ethnic groups, and hence patient satisfaction can be expected.11,12 The first MTPJ is also a major site of osteoarthritis that can be treated successfully with joint replacement surgery.1,9,11 Our paper highlights good patient satisfaction from different ethnic backgrounds (Table 1), in accordance with the local studies.11,12

Treatment modalities for the hallux rigidus are controversial and many options have been described in management of the disease. Non-surgical management of stage 1 and stage 2 hallux rigidus may provide some relief to the patients.9 For advanced stage, surgical intervention is needed to reduce pain and improve functional stability. The type of surgery depends upon the stage of hallux rigidus.13 Cheilectomy surgical procedure (removal of osteophytes and joint debridement) is usually advocated to treat mild hallux rigidus.1 Closing wedge osteotomy (dorsal) can be performed for the phalanx to improve functional stability.14 Arthrodesis, accepted as the gold standard technique for grade 3 and 4 hallux rigidus, provides pain relief but sacrifices joint movements.4,8

The biggest benefit of joint replacement surgery is preservation of joint movements and a shorter rehabilitation with immediate mobilisation. Although initial results of other implants were promising, they subsequently led to failure. Silastic (silicon rubber) resulted in osteolysis and inflammatory immune reaction causing bony resorption and implant loosening.7

Metal alloy and ceramic implants failed because of relative hardness of the material versus bone, causing wear within the bony canal.15

We have presented promising results following surgery for hallux rigidus using this new implant. No complications were reported in our series. Serial radiological and clinical examination found no evidence of failure and implant loosening.

Studies in the UK and North America show similar results in favour of first MTPJ arthroplasty using Cartiva implant.12

We believe that for Singapore’s population, joint replacement can be the “new gold standard” for moderate to advanced stages of hallux rigidus. This can benefit patients who are active and wish to have their toe movements preserved; and women who want to continue wearing high heels.16

REFERENCES

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