Collateral soft tissue release in primary total knee replacement

Figures & data

Table I. Patient demographics and pre-operative data.

	N
Sex	119 (53%) F
	105 (47%) M
Age	Mean 69 [SD 8.6]
Operated side	116 right
	108 left
Diagnosis	209 (93%) osteoarthritis
	7 (3%) rheumatoid arthritis
	8 (4%) other inflammatory arthritis
BMI	31 [SD 4]
Pre-op. Oxford score	Mean: 42 [SD 8]
Pre-op. FTMA measured	Mean: −4.5° SD 7.6°
on long leg radiograph	Range: −25° to 27°
Pre-op. FTMA measured	Mean: −3.3° SD 6.4°
with computer navigation	Range: −20° to 24°
Kinematics	5% of knees had FTMA 0 ± 2° throughout the full range of flexion

Varus: negative; valgus: positive

Table II. Details of patients requiring collateral soft tissue release.

Patient	Sex	Age	Diagnosis	Pre-op. coronal FTMA radiographic/navigation	Release needed	Pre-op. range of coronal deformity from full extension to full flexion	Post-op. coronal FTMA radiographic/ navigation	Post-op. range of coronal deformity throughout flexion
1	M	73	Osteoarthritis	12/7.5	Lateral	6 to 14	2/0	1 to −1
2	M	75	Osteoarthritis	−8/−7	Medial	−7 to −5	−2/0	1 to −2
3	M	67	Osteoarthritis	−7/−5.5	Medial	−4 to −6	1/1	0.5 to 2
4	M	64	Osteoarthritis	−8/−7	Medial	−12 to −5	0/0	0 to −2
5	F	54	Osteoarthritis	−4/−11	Medial	−11 to −13	1/1	1 to −1

Varus: negative; Valgus: positive

Table III. Postoperative functional assessment data.

		Patient satisfaction
	Oxford Knee Score*	Very satisfied	Satisfied	Unsure	Dissatisfied
6 weeks post-op.	29 [8]	136/194	40/194	15/194	2/194
		70%	21%	8%	1%
1 year post-op.	23 [9]	148/191	26/191	13/191	4/191
		77%	14%	7%	2%

*Mean [Standard Deviation] presented for continuous variables