In 85 to 90% of rheumatoid patients the foot is affected, to some extent also early in the disease process. The forefoot is most commonly involved, followed by the midfoot and ankle joint.
The fundamental principle of therapy—proximal before distal—also applies to the foot. Thus, lower ankle joint destruction should be addressed before treating forefoot involvement. It is, however, essential to keep in mind that every rheumatic patient requires an individual approach.
Forefoot synovectomies are rarely performed. In addition, joint-preserving procedures are becoming increasingly prevalent. The key factor in determining indications for treatment, more so than for the nonrheumatoid forefoot, is the condition of the soft tissues. On the one hand, the inflammatory process can lead to soft tissue contractures that can only be partially corrected. This plays a far greater role than the existence of bony deformities when determining indications for a joint-preservation intervention. If, for example, the great toe proximal joint is no longer reducible into a neutral position preoperatively, we believe there is tremendously increased risk of recurrence and that it is worth considering whether an arthrodesis would not be more advantageous. This is even more of a consideration if the great toe deformity has led to a fibular deviation of the second through fifth toes. The focus, therefore, should be on stabilizing and correcting the first ray.
On the other hand, the condition of the medial capsule plays a significant role in determining indications for treatment. The capsule structures are sometimes extremely elongated in rheumatoid patients and can lead to recurrence despite a good bony corrective result. It is, however, often quite difficult to evaluate the condition of the medial capsule preoperatively. Because of this, we have a frank discussion with these patients and inform them that the final decision between joint preservation or fusion will be determined intraoperatively, depending upon the soft tissues.
On the whole, the second through fifth toes are more difficult to correct than the great toes, which is an important consideration when determining the course of treatment.
Toe deformities are frequently associated with additional anatomical changes:
Dislocation of proximal joints (consider joint arthrolysis or a Weil osteotomy with dorsal wedge).
Lateral elongation of the capsule with fibular deviation of the toes (consider capsuloplasty and duplication).
Despite the emergence of joint-preserving operations, forefoot metatarsal head resection continues to remain the “gold standard.” It is also one of the “number one” procedures, because it is as successful and subjectively satisfying for the patient as the hip and knee prosthesis. We also favor this procedure at the outset of the surgical intervention plan outlined for the patients. The procedure can be performed from either a dorsal or a plantar approach, depending upon the surgeon’s training; both procedures presented here produce good results. It is not unusual to perform bilateral forefoot corrections in order to minimize hospitalizations.
Arthrodesis is the standard procedure for correction of the first ray in the presence of contracture. A Swanson prosthesis presents an alternative for joint destruction with correctable soft tissue.
Because the soft tissue has a pivotal role in both indications and the operative approach, it should be protected during the postoperative healing process by use of orthotics or individually fitted ergonomic equipment.
Impaired wound healing is a major issue for rheumatoid patients due to the underlying illness and its associated medication therapy.
5.2 Proximal Corrective Osteotomy
Indication
Severe rheumatic splayfoot. Rheumatic splayfoot with an intermetatarsal angle ≥ 18°. Soft tissues must be correctable. Larsen I–II destruction.
Specific disclosures for patient consent
Impaired wound healing. Pseudarthrosis. Metatarsal head necrosis with sequelae (arthrodesis). Joint stiffness. Recurrence. Infection. Tendon injury. Blood vessel, nerve injury.
Instruments
Locking plate. For L-shaped or Z-shaped screw fixation osteosynthesis, 2.7 to 4.0-mm cancellous screws.
Position
Supine. Foot in neutral position with toes pointed upward. A pelvic support and tilting of the table can be used to achieve a better ankle position. Lower the contralateral foot. The foot is positioned with the edge of the heel over the end of the table.
Intraoperative radiographic imaging is only rarely needed.
Key steps
An intermetatarsal skin incision is made between the first and second toes to repair soft tissues: release the adductor hallucis muscle and, depending upon the specific situation, perform a lateral release (see Chapter 5.3).
Alternative: crescentic osteotomy at the first metatarsal base.
Postoperative aftercare
An orthotic to protect the soft tissues is worn full time for 6 weeks, and then at nighttime only for an additional 6 weeks. A forefoot decompression shoe is used for 6 weeks. After that, radiographic imaging is performed for clearance to full weight bearing. Soft cushion insoles are used after foot swelling has subsided.
5.3 Scarf Osteotomy
Indication
Severe rheumatic splayfoot. Rheumatoid hallux valgus with an intermetatarsal angle of 10 to 18° (20°). Soft tissues must be correctable. Larsen I–II destruction.
Specific disclosures for patient consent
Impaired wound healing. Pseudarthrosis. Metatarsal head necrosis with sequelae (arthrodesis). Recurrence. Infection. Joint stiffness. Tendon injury. Blood vessel, nerve injury.
Prosthesis placement is no longer possible following a Scarf osteotomy.
Instruments
Screw 2.3-mm or 2.7-mm with flat head. Specialized countersinkable headless screws equipped with two different threads (“Herbert” screw).
Position
Supine. Foot in neutral position with toes pointing upward. A pelvic support and tilting of the table can be used to achieve a better ankle position. Lower the contralateral foot. The foot is positioned with the edge of the heel over the end of the table.
Intraoperative radiographic imaging is only rarely needed.
An orthotic to protect the soft tissues is worn full time for 6 weeks, and then at nighttime only for an additional 6 weeks. A forefoot decompression shoe is used for 6 weeks. After that, radiographic imaging is performed for clearance to full weight bearing. Soft cushion insoles are used once foot swelling has subsided.
5.4 Great Toe Metatarsophalangeal Joint Arthrodesis
Indication
Larsen III–V great toe proximal joint destruction with significant clinical symptoms. Contracted hallux deformity (varus or valgus), not passively correctable, with severe rheumatic splayfoot (Fig. 5‑15 ).
Alternatives: plate, combined with a 2.7-mm lag screw; 2.7-mm cross screws. Locking plate system.
Position
Supine. Foot in neutral position with toes pointing upward. A pelvic support and tilting the table can be used to achieve a better ankle position. Lower the contralateral foot. The foot lies with the edge of the heel over the end of the table.
Intraoperative radiographic imaging is only rarely needed.
A forefoot decompression shoe is used for 6 weeks. After that, radiographic imaging is performed for clearance to full weight bearing. Soft cushion insoles are used once foot swelling has subsided.
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