Table 1 Descriptive statistics of demographics
Variables | Number (n = 41) |
|---|---|
Age (years) | 66.4 (range 51–74) |
Sex | |
Male | 12 (29.2%) |
Female | 29 (70.7%) |
Site of arthroplasty | |
Right | 18 (43.9%) |
Left | 22 (53.6%) |
Bilateral | 1 (2.43%) |
Body mass index (BMI) | 29.2 (range 20.2–50.2) |
Comorbidities | |
Diabetes mellitus (DM) | 11 (26.8%) |
Hypertension (HTN) | 15 (36.5%) |
Ischemic heart disease (IHD) | 3 (7.31%) |
Rheumatoid arthritis (RA) | 4 (9.7%) |
Asthma | 3 (7.31%) |
SLE | – |
> 2 comorbidities | 4 (9.7%) |
No comorbidities | 1 (2.43%) |
Indications for the rotating hinge knee (RHK) | |
A. Revision total knee arthroplasty | |
Aseptic loosening of primary knee implant | 25 (60.9%) |
Prosthetic joint infection after primary TKA | 2 (4.87%) |
Global instability following primary TKA | 11 (26.8%) |
B. Complex primary knees with bone loss | |
Varus deformity (> 30°) | 1 (2.43%) |
Valgus deformity (> 30°) | 1 (2.43%) |
Fixed flexion deformity (> 30°) | 1 (2.43%) |
Recurvatum deformity (> 10°) | – |
Deformity in > 1 plane | – |
AORI classification for bone loss | |
T1 | 4 (9.75%) |
T2a | 27 (65.8%) |
T2b | 1 (2.43%) |
T3 | 2 (4.87%) |
F1 | 3 (7.31%) |
F2a | 2 (4.87%) |
F2b | 1 (2.43%) |
F3 | 1 (2.43%) |