Table 2.
The AOFAS ankle-hindfoot scores (total possible 100 points) and range of motion*
| Studied parameter | Group of patients (n = number of prostheses) | ||||||
|---|---|---|---|---|---|---|---|
| Overall (n = 87) | RA (n = 23) | OA (n = 64) | p Value RA versus OA | ||||
| Mean ± SD | Range | Mean ± SD | Range | Mean ± SD | Range | ||
| Preoperative AOFAS | 26.7 ± 8.9 | 6 to 53 | 21.8 ± 8.3 | 7 to 35 | 28.7 ± 8.3 | 6 to 53 | < 0.001 |
| Postoperative AOFAS | 79.3 ± 11.9 | 43 to 99 | 76.3 ± 14.8 | 43 to 99 | 80.6 ± 10.3 | 44 to 97 | 0.070 |
| p value (preoperative versus postoperative score) | < 0.0001 | < 0.0001 | < 0.0001 | ||||
| Dorsiflexion (°) | 8.6 ± 5.3 | −5 to 20 | 10.4 ± 5.5 | 0 to 20 | 7.8 ± 5.1 | −5 to 20 | 0.025 |
| Plantar flexion (°) | 18.1 ± 7.8 | 5 to 40 | 16.3 ± 8.3 | 5 to 30 | 18.8 ± 7.6 | 0 to 40 | 0.076 |
* The results are indicated for the overall group (rheumatoid arthritis [RA] and osteoarthritis [OA]); the statistical comparison was made between the RA and OA groups (p < 0.05 considered significant); ROM was measured for the 81 patients with the prosthesis still retained at final followup (excluding patients who had conversion surgery to arthrodesis); AOFAS = American Orthopaedic Foot and Ankle Society.