SPLIT TIBIALIS ANTERIOR TENDON TRANSFER (SPLATT) IN RECURRENT CLUBFOOT DEFORMITY

Abstract

Residual club foot (CTEV) is a challenging deformity which may require transfer of the tibialis anterior tendon to a more lateral position. The senior author has developed a modified SPLATT for residual forefoot supination in CTEV.

We describe the SPLATT procedure and evaluate clinical and radiological outcomes of 11 patients(14 feet) (mean follow up 6.6 years; range 5.5–8.9) (mean age 6.9 years; range 2.9–10.0). Two patients had cerebral palsy, 1 spina bifida and 1 juvenile rheumatoid arthritis, the remaining 7 patients were ideopathic.

Outcome measures based on patient centred assessment of function and foot appearance, by using the patient applied assessments of Chesney, Utukuri and Laaveg & Ponsetti (there is increasing recognition that doctor-centred or radiograph-based scoring systems do not tally well with patient satisfaction).

Objective assessment of outcome was provided by measurement of certain radiological parameters on the immediate pre-operative and the follow up weight-bearing radiographs (1st ray angle, talar-1st metatarsal angle, talar-2nd metatarsal angle, talo-calcaneal angle). The calcaneal line passing through the medial 1/3 of the cuboid or medial to the fourth metatarsal was also noted. The Blecks grade was recorded (pre-op 100% moderate-severe; post-op 88% mild-moderate). Parents assessed outcome based upon ‘best level of activity’, functional limitation and willingness to recommend treatment to others.

Mean Chesney score at the time of follow up was 12.3 (8 to 15); mean Utukuri score was 15.8 (10 to 24); Laaveg and Ponsetti score was 81.5 (67 to 95). The best activity level achievable was ‘unlimited’ in 4 patients, ‘football’ in 4 patients, ‘running’ in 1 and limited by an associated condition in 2 patients (1 juvenile rheumatoid arthritis; 1 cerebral palsy related spastic paraparesis). All patients/parents indicated that they would undergo the same procedure again. One patient had delayed wound healing treated successfully with dressings.

The 1st ray angle pre-operatively was 61.2°(range 50–70°), post-operatively it was 62.1°(range 50–81°). The talar-1st metatarsal angle was 28.8°(range 15–44°) pre-operatively and 19.1°(range 4–34°) post-operatively. The pre and post–operative talar-2nd metatarsal angles were 22.5°(range 0–35°) and 12.3(range 0–29°) respectively, the talo-calcaneal angle was 17.5°(range 10–35°) and 13.7(range 5–20°) respectively. The pre and postoperative lateral talo-calcaneal angles were 34.5°(range 25–40°) and 30.6(range 13–45°).

The recognition that patient orientated subjective assessment is gaining in acceptance, and confirm patient satisfaction with function, cosmesis and pain levels with the SPLATT procedure. More traditional radiological outcome measures also confirm that the modified SPLATT is a safe, effective and acceptable procedure.