Abstract
[Purpose]
There have been only a few reports about the efficacy of postoperative cryotherapy following total hip arthroplasty (THA), and past studies have described that local cooling is efficacy for pain relief. The purpose of this study is whether the continuous local cooling following THA is effective for pain relief and the reduction of blood loss, swelling, and the duration of hospital stay.
[Materials and Methods]
Thirty-eight patients (39 hips) underwent primary cementless THA for osteoarthritis and were divided into a cryotherapy group (30 subjects; from Apr. 2013 to Oct. 2013) and a control group (9 subjects; from Nov. 2012 to Mar. 2013). In the cryotherapy group, a continuous cooling pad was applied on the surgical wound and the thigh with a cloth anchor band (CF-3000, Sigmax, Japan) with the cooling temperature set to a constant 5°C for 72 hours immediately after surgery. Blood was collected on postoperative days 1,4,7,14, and 21 to determine Hb, CK, and CRP levels. Postoperative pain of the hip was scored by using a visual analog scale questionnaire on postoperative days 1 to 28. Total doses of selecoxib and dicrofenac sodium used for pain relief were measured. The circumference of patellar superior border was measured on postoperative days 4,7,14, and 28.
The unpaired t-test was used for blood tests as well as for comparisons between the cryotherapy and control groups, and the Mann-Whitney U test was used for the analysis of age, BMI, approach of the surgery, analgesic use, pain scores, the circumference of the thigh and the duration of hospital stay.
[Results]
There were no significant differences in age (p = 0.605), BMI (p = 0.790), approach of the surgery (p = 0.572), duration of the surgery (p = 0.117), blood loss during surgery (p = 0.739), or hospital stay (p = 0.169) between the cryotherapy and the control. There were no significant differences between the 2 groups in CK, CRP levels, or pain scores. However, Hb levels measured postoperatively in only day 4 and the total dose of selecoxib was used for pain relief were significantly lower for the cryotherapy group than for the control group, respectively (p = 0.028, p = 0.003), and the total dose of dicrofenac sodium was tend to be significant lower for the cryotherapy group. (p = 0.070). The circumference of patellar superior border measured postoperatively in only day 4 was significantly lower for the cryotherapy group than for the control group (p = 0.010). No complications such as skin problems or neuroparalysis were observed.
[Discussion]
This study found the reduction of blood loss, swelling on the patellar superior border, and the total dose of selecoxib for the patients undergoing cryotherapy. However, the pain-relief efficacy of postoperative cryotherapy has not been recognized. Postoperative continuous cryotheraapy is a simple, noninvasive, and effective approach for the reduction of blood loss and swelling following THA.
