Table 1. Patient Characteristics, Calf Cramps Profile at Baseline, and Clinical Presentations During the Study Period

Patient No.	Sex	Age (Years)	Side	Duration (Months)	T0									T2						History of spine surgery	Current medications
Patient No.	Sex	Age (Years)	Side	Duration (Months)	NRS	ISI	FC	TrPs B and D, Lt	TrPs A and C, Lt	TrPs A and C, Rt	TrPs B and D, Rt	TrPs (n)	TPI	TrPs B and D, Lt	TrPs A and C, Lt	TrPs A and C, Rt	TrPs B and D, Rt	TrPs (n)	TPI	History of spine surgery	Current medications
1	F	52	Both	36	4	24	1	X	O	O	X	6	Yes	X	X	O	X	3	Yes	None	–
1	F	52	Both	36	4	24	1	O	O	O	O	6	Yes	X	O	O	X	3	Yes	None	–
2	F	70	Both	48	9	18	14	X	O	O	X	6	Yes	X	X	X	X	4	Yes	None	–
2	F	70	Both	48	9	18	14	O	O	O	O	6	Yes	O	O	O	O	4	Yes	None	–
3	F	70	Both	48	7	22	2	X	O	O	O	6	Yes	X	X	O	X	2	Yes	None	–
3	F	70	Both	48	7	22	2	X	O	O	O	6	Yes	X	X	O	X	2	Yes	None	–
4	F	80	Both	12	7	25	3	O	O	O	O	6	Yes	X	X	O	X	3	Yes	None	Phenytoin 100 mg daily
4	F	80	Both	12	7	25	3	X	O	O	X	6	Yes	X	O	O	X	3	Yes	None	Phenytoin 100 mg daily
5	M	69	Both	36	8	7	3	X	O	O	X	4	Yes	X	X	X	X	2	Yes	None	Neurontin 900 mg daily
5	M	69	Both	36	8	7	3	X	O	O	X	4	Yes	X	O	O	X	2	Yes	None	Neurontin 900 mg daily
6	F	52	Right	36	8	21	3	X	X	O	O	3	Yes	X	X	X	X	0	No	None	–
6	F	52	Right	36	8	21	3	X	X	O	X	3	Yes	X	X	X	X	0	No	None	–
7	F	58	Right	36	7	15	7	X	X	X	O	3	Yes	X	X	X	X	0	No	PLIF L4/5/S1	–
7	F	58	Right	36	7	15	7	X	X	O	O	3	Yes	X	X	X	X	0	No	PLIF L4/5/S1	–
8	F	56	Both	60	7	19	14	X	O	O	X	6	Yes	X	O	O	X	6	No	PLIF L3/4/5	–
8	F	56	Both	60	7	19	14	O	O	O	O	6	Yes	O	O	O	O	6	No	PLIF L3/4/5	–
9	F	68	Right	36	5	15	4	X	X	X	X	2	Yes	X	X	X	X	2	No	PLIF L4/5	–
9	F	68	Right	36	5	15	4	X	X	O	O	2	Yes	X	X	O	O	2	No	PLIF L4/5	–
10	M	47	Right	36	5	14	2	X	X	X	O	2	Yes	X	X	X	O	2	Yes	Laminectomy L5/S1	–
10	M	47	Right	36	5	14	2	X	X	X	O	2	Yes	X	X	X	O	2	Yes	Laminectomy L5/S1	–
11	M	74	Both	36	10	17	14	X	O	O	X	5	Yes	X	X	X	X	0	No	None	–
11	M	74	Both	36	10	17	14	X	O	O	O	5	Yes	X	X	X	X	0	No	None	–
12	F	61	Both	12	6	16	21	O	O	O	O	6	Yes	O	O	O	O	6	Yes	PLIF L2/3	–
12	F	61	Both	12	6	16	21	X	O	O	X	6	Yes	X	O	O	X	6	Yes	PLIF L2/3	–

O indicates the existence of a trigger point. X indicates no existence of a trigger point.
F, female; FC, frequency of nocturnal calf cramps; ISI, Insomnia Severity Index; Lt, left; M, male; NRS, numerical rating scale pain score; PLIF, posterior lumbar interbody fusion; Rt, right; T0, baseline; T2, 2 weeks after the first injection; TPI, trigger point injection; TrP, trigger point (shown in Figure 1A).